In this Video, Dr. Seema Batra, Assistant professor, Biyani Groups of Colleges, Jaipur, explains about the concept of symmetric and asymmetric cryptography. http://www.gurukpo.com/ http://www.biyanicolleges.org/
Views: 12644 Guru Kpo
KnowledgeTube™ video explaining the features and benefits of Symmetric and true Asymmetric lifts. ©2013 Vehicle Service GroupSM, All Rights Reserved. Unless otherwise indicated, Rotary Lift® and all other trademarks are property of Dover Corporation and its affiliates.
Views: 2835 Rotary Lift
Modern day encryption is performed in two different ways. Check out http://YouTube.com/ITFreeTraining or http://itfreetraining.com for more of our always free training videos. Using the same key or using a pair of keys called the public and private keys. This video looks at how these systems work and how they can be used together to perform encryption. Download the PDF handout http://itfreetraining.com/Handouts/Ce... Encryption Types Encryption is the process of scrambling data so it cannot be read without a decryption key. Encryption prevents data being read by a 3rd party if it is intercepted by a 3rd party. The two encryption methods that are used today are symmetric and public key encryption. Symmetric Key Symmetric key encryption uses the same key to encrypt data as decrypt data. This is generally quite fast when compared with public key encryption. In order to protect the data, the key needs to be secured. If a 3rd party was able to gain access to the key, they could decrypt any data that was encrypt with that data. For this reason, a secure channel is required to transfer the key if you need to transfer data between two points. For example, if you encrypted data on a CD and mail it to another party, the key must also be transferred to the second party so that they can decrypt the data. This is often done using e-mail or the telephone. In a lot of cases, sending the data using one method and the key using another method is enough to protect the data as an attacker would need to get both in order to decrypt the data. Public Key Encryption This method of encryption uses two keys. One key is used to encrypt data and the other key is used to decrypt data. The advantage of this is that the public key can be downloaded by anyone. Anyone with the public key can encrypt data that can only be decrypted using a private key. This means the public key does not need to be secured. The private key does need to be keep in a safe place. The advantage of using such a system is the private key is not required by the other party to perform encryption. Since the private key does not need to be transferred to the second party there is no risk of the private key being intercepted by a 3rd party. Public Key encryption is slower when compared with symmetric key so it is not always suitable for every application. The math used is complex but to put it simply it uses the modulus or remainder operator. For example, if you wanted to solve X mod 5 = 2, the possible solutions would be 2, 7, 12 and so on. The private key provides additional information which allows the problem to be solved easily. The math is more complex and uses much larger numbers than this but basically public and private key encryption rely on the modulus operator to work. Combing The Two There are two reasons you want to combine the two. The first is that often communication will be broken into two steps. Key exchange and data exchange. For key exchange, to protect the key used in data exchange it is often encrypted using public key encryption. Although slower than symmetric key encryption, this method ensures the key cannot accessed by a 3rd party while being transferred. Since the key has been transferred using a secure channel, a symmetric key can be used for data exchange. In some cases, data exchange may be done using public key encryption. If this is the case, often the data exchange will be done using a small key size to reduce the processing time. The second reason that both may be used is when a symmetric key is used and the key needs to be provided to multiple users. For example, if you are using encryption file system (EFS) this allows multiple users to access the same file, which includes recovery users. In order to make this possible, multiple copies of the same key are stored in the file and protected from being read by encrypting it with the public key of each user that requires access. References "Public-key cryptography" http://en.wikipedia.org/wiki/Public-k... "Encryption" http://en.wikipedia.org/wiki/Encryption
Views: 470655 itfreetraining
http://www.gregsmithequipment.com/Shop/2-Post-Lifts - What is the difference between symmetric and asymmetric? Most of our customers ask that question. This video explains the difference between asymmetric arms and symmetric arms on an above ground lift.
Views: 343159 gregsmithequipment
George Akerlof, a Nobel Prize-winning economist, analyzed the theory of adverse selection – which occurs when an offer conveys negative information about what is being offered. In the market for used cars, Akerlof posited that sellers have more information about the car’s quality than buyers. He argued that this leads to the death spiral of the market, and market failure. However, the market has developed solutions such as warrantees, guarantees, branding, and inspections to offset information asymmetry. Microeconomics Course: http://bit.ly/20VablY Ask a question about the video: http://bit.ly/1T7d6ZY Next video: http://bit.ly/1TzdfDZ
Views: 163917 Marginal Revolution University
This lesson explains the Symmetric Encryption & Caesar Cipher, under the course, "Cryptography and Network Security for GATE". The lesson explains the following subtopics: Symmetric Encryption Substitution Techniques Transposition Techniques Caesar Cipher Some important terminology and concepts are also illustrated, for the better understanding of the subject. For the entire course: https://goo.gl/aTMBNZ For more lessons by Ansha Pk: https://goo.gl/2DX9Wn Must watch for all the GATE/ESE/PSU Exams. Download the Unacademy Learning App from the Google Play Store here:- https://goo.gl/02OhYI Download the Unacademy Educator app from the Google Play Store here: https://goo.gl/H4LGHE Do Subscribe and be a part of the community for more such lessons here: https://goo.gl/UGFo7b Visit Our Facebook Group on GATE here: https://goo.gl/cPj5sb Symmetric Encryption & Caesar Cipher: Cryptography and Network Security - Unacademy GATE(CSE)
Views: 8262 Unacademy - GATE Preparation
Views: 980 Bill Buchanan OBE
In recent years, XML Encryption became a target of several new attacks. These attacks belong to the family of adaptive chosen-ciphertext attacks, and allow an adversary to decrypt symmetric and asymmetric XML ciphertexts, without knowing the secret keys. In order toprotect XML Encryption implementations, the World Wide Web Consortium (W3C) published an updated version of the standard. Unfortunately, most of the current XML Encryption implementations do not support the newest standard and offer different XML Security configurations to protect confidentiality of the exchanged messages. Resulting from the attack and specification complexity, evaluation of the security configuration correctness becomes tedious and error prone. In this talk, we will first give an overview on Web Service specific attacks. Afterwards, we present attacks on XML Encryption and how to evaluate security of XML Encryption interfaces automatically. Our algorithm can detect a vulnerability and exploit it to retrieve a plaintext from an encrypted message. To assess practicability of our approach, we implemented an open source attack plugin for Web Service attacking tool called WS-Attacker. With the plugin, we discovered new security problems in four out of five analyzed Web Service implementations, including IBM Datapower or Apache CXF. Dr. Juraj Somorovsky finished his PhD in the area of XML Security in 2013. In his thesis „On the Insecurity of XML Security" he analyzes various cryptographic attacks on Web Services and presents practical countermeasures against these attacks, which were applied in XML Security specifications and in countless frameworks and applications. He presented his work at many scientific and industry conferences, including Usenix Security or OWASP Germany. Currently, he works as a Postdoc at the Ruhr University Bochum, and as a security specialist for his co-founded company 3curity GmbH.
Views: 350 Sicherheitsforschung
by Juraj Somorovsky In recent years, XML Encryption has become a target of several new attacks. These attacks belong to the family of adaptive chosen-ciphertext attacks, and allow an adversary to decrypt symmetric and asymmetric XML ciphertexts, without knowing the secret keys. In order to protect XML Encryption implementations, the World Wide Web Consortium (W3C) published an updated version of the standard. Unfortunately, most of the current XML Encryption implementations do not support the newest XML Encryption specification and offer different XML Security configurations to protect confidentiality of the exchanged messages. Resulting from the attack complexity, evaluation of the security configuration correctness becomes tedious and error prone. Validation of the applied countermeasures can only be made with numerous XML messages provoking incorrect behavior by decrypting XML content. Up to now, this validation was only manually possible. In this talk, we give an overview on the analysis of chosen-ciphertext attacks on XML Encryption and design an algorithm to perform a vulnerability scan on arbitrary encrypted XML messages. The algorithm can automatically detect a vulnerability and exploit it to retrieve the plaintext of a message protected by XML Encryption. To assess practicability of our approach, we implemented an open source attack plugin for Web Service attacking tool called WS-Attacker. With the plugin, we discovered new vulnerabilities in four out of five analyzed Web Service implementations, including IBM Datapower or Apache CXF.
Views: 3024 Black Hat
This tutorial shows you how to generate RSA Public Keys and store them in the Key Chain in Swift 4 and Xcode 9 Public Key Encryption allow you to securely encrypt communications within your iOS 11 apps and we will be showing you how to do this using the Firebase database iOS Keys are made available in the SecKey format and we will need to change these to a String format to save the public key to the Firebase database for distribution. Tutorial 2:13 In this tutorial we will be using RSA Public Key Encryption which is an asymmetric encryption type.
Views: 1292 Swift Almanac
Video shows what asymmetrical means. Not symmetrical.. Presenting a false dilemma, or a choice between two things which are not opposites.. Asymmetrical Meaning. How to pronounce, definition audio dictionary. How to say asymmetrical. Powered by MaryTTS, Wiktionary
Views: 1725 SDictionary
A basic introduction to encryption/cryptography, from a cyber security standpoint. Given that a lot of important people don't really understand how one of the most vital components of our 21st century infrastructure ie. the internet works, this video had to be done. ------------------------------------------- Thanks for watching! If you like what you see, check out the links below. Patreon: https://www.patreon.com/tpsc Forum: https://forum.thepcsecuritychannel.com/ Twitter: https://twitter.com/leotpsc Facebook: https://www.facebook.com/tpscyt
Views: 6371 The PC Security Channel [TPSC]
Security+ Training Course Index: http://professormesser.link/sy0401 Professor Messer’s Course Notes: http://professormesser.link/sy0401cn Frequently Asked Questions: http://professormesser.link/faq - - - - - Asymmetric encryption uses two different keys to provide a secure channel. In this video, you’ll learn how public keys and private keys can be used to encrypt data, create digital signatures, and create a secure symmetric key. - - - - - Download entire video course: http://professormesser.link/401adyt Get the course on MP3 audio: http://professormesser.link/401vdyt Subscribe to get the latest videos: http://professormesser.link/yt Calendar of live events: http://www.professormesser.com/calendar/ FOLLOW PROFESSOR MESSER: Professor Messer official website: http://www.professormesser.com/ Twitter: http://www.professormesser.com/twitter Facebook: http://www.professormesser.com/facebook Instagram: http://www.professormesser.com/instagram Google +: http://www.professormesser.com/googleplus
Views: 41369 Professor Messer
Security+ Training Course Index: http://professormesser.link/sy0501 Professor Messer’s Course Notes: http://professormesser.link/501cn Frequently Asked Questions: http://professormesser.link/faq - - - - - If you can’t hack the user, you may be able to hack the cryptography. In this video, you’ll learn about some common cryptographic attacks. - - - - - Subscribe to get the latest videos: http://professormesser.link/yt Calendar of live events: http://www.professormesser.com/calendar/ FOLLOW PROFESSOR MESSER: Professor Messer official website: http://www.professormesser.com/ Twitter: http://www.professormesser.com/twitter Facebook: http://www.professormesser.com/facebook Instagram: http://www.professormesser.com/instagram Google +: http://www.professormesser.com/googleplus
Views: 41246 Professor Messer
Sentdex.com Facebook.com/sentdex Twitter.com/sentdex How to use python to encrypt sensitive information, and later decrypt it, using PyCrypto! PyCrypto: https://www.dlitz.net/software/pycrypto/ The Code: http://sentdex.com/sentiment-analysisbig-data-and-python-tutorials/encryption-and-decryption-in-python-code-example-with-explanation/
Views: 83681 sentdex
Today we’re going to talk about how to keep information secret, and this isn’t a new goal. From as early as Julius Caesar’s Caesar cipher to Mary, Queen of Scots, encrypted messages to kill Queen Elizabeth in 1587, theres has long been a need to encrypt and decrypt private correspondence. This proved especially critical during World War II as Allan Turing and his team at Bletchley Park attempted to decrypt messages from Nazi Enigma machines, and this need has only grown as more and more information sensitive tasks are completed on our computers. So today, we’re going to walk you through some common encryption techniques such as the Advanced Encryption Standard (AES), Diffie-Hellman Key Exchange, and RSA which are employed to keep your information safe, private, and secure. Note: In October of 2017, researchers released a viable hack against WPA2, known as KRACK Attack, which uses AES to ensure secure communication between computers and network routers. The problem isn't with AES, which is provably secure, but with the communication protocol between router and computer. In order to set up secure communication, the computer and router have to agree through what's called a "handshake". If this handshake is interrupted in just the right way, an attacker can cause the handshake to fault to an insecure state and reveal critical information which makes the connection insecure. As is often the case with these situations, the problem is with an implementation, not the secure algorithm itself. Our friends over at Computerphile have a great video on the topic: https://www.youtube.com/watch?v=mYtvjijATa4 Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios Want to know more about Carrie Anne? https://about.me/carrieannephilbin The Latest from PBS Digital Studios: https://www.youtube.com/playlist?list=PL1mtdjDVOoOqJzeaJAV15Tq0tZ1vKj7ZV Want to find Crash Course elsewhere on the internet? Facebook - https://www.facebook.com/YouTubeCrash... Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support Crash Course on Patreon: http://patreon.com/crashcourse CC Kids: http://www.youtube.com/crashcoursekids
Views: 205647 CrashCourse
Security of Symmetric Encryption against Mass Surveillance by Mihir Bellare, Kenneth G. Paterson, Phillip Rogaway. Talk at Crypto 2014.
Views: 709 TheIACR
Converting Cryptographic Schemes from Symmetric to Asymmetric Bilinear Groups by Masayuki Abe, Miyako Ohkubo, Jens Groth, Takeya Tango. Talk at Crypto 2014.
Views: 354 TheIACR
An introduction to CKMS: delivering automated and secure crypto key distribution to any endpoint.
Views: 905 CRYPTOMAThIC
Why do we need public key cryptography? Watch the next lesson: https://www.khanacademy.org/computing/computer-science/cryptography/modern-crypt/v/discrete-logarithm-problem?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Missed the previous lesson? https://www.khanacademy.org/computing/computer-science/cryptography/modern-crypt/v/the-fundamental-theorem-of-arithmetic-1?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Computer Science on Khan Academy: Learn select topics from computer science - algorithms (how we solve common problems in computer science and measure the efficiency of our solutions), cryptography (how we protect secret information), and information theory (how we encode and compress information). About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Computer Science channel: https://www.youtube.com/channel/UC8uHgAVBOy5h1fDsjQghWCw?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Views: 130002 Khan Academy Labs
visual C# Adding AES encryption to C# application Forms Application encryption encrypt- decrypt with AES using C# Forms Application Advanced Encryption Standard Rijndael cipher Forms Application C# - Simple AES encryption using Visual C# cryptographic encrypt my 128 bit string using AES encryption cryptography C#
Views: 47779 ProgrammingKnowledge
In this video tutorial we study the basic principles of Network security and also see the concept of Cryptography by understanding a basic example. Principles of Network Security to be discussed in this video are as follows: Confidentiality Authentication Integrity Non-repudiation Access Control Availability We will also learn the concept of Cryptography in this tutorial. Here's the definition of Cryptography: Cryptography is the art of achieving security by encoding messages to make them non-readable This video is a continuation of the previous video so make sure you check that video as well so that you get to know some basics of Network security. Download the FREE Network Security App on Google Playstore for Android - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials Simple Snippets on Facebook- https://www.facebook.com/simplesnippets/ Simple Snippets on Instagram- https://www.instagram.com/simplesnipp... Simple Snippets Google Plus Page- https://plus.google.com/+SimpleSnippets Simple Snippets email ID- [email protected] Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials For Classroom Coaching in Mumbai for Programming & other IT/CS Subjects Checkout UpSkill Infotech - https://upskill.tech/ UpSkill is an Ed-Tech Company / Coaching Centre for Information Technology / Computer Science oriented courses and offer coacing for various Degree courses like BSc.IT, BSc.CS, BCA, MSc.IT, MSc.CS, MCA etc. Contact via email /call / FB /Whatsapp for more info email - [email protected] We also Provide Certification courses like - Android Development Web Development Java Developer Course .NET Developer Course Check us out on Social media platforms like Facebook, Instagram, Google etc Facebook page - https://www.facebook.com/upskillinfotech/ Insta page - https://www.instagram.com/upskill_infotech/ Google Maps - https://goo.gl/maps/vjNtZazLzW82
Views: 23442 Simple Snippets
Fundamentals of Computer Network Security This specialization in intended for IT professionals, computer programmers, managers, IT security professionals who like to move up ladder, who are seeking to develop network system security skills. Through four courses, we will cover the Design and Analyze Secure Networked Systems, Develop Secure Programs with Basic Cryptography and Crypto API, Hacking and Patching Web Applications, Perform Penetration Testing, and Secure Networked Systems with Firewall and IDS, which will prepare you to perform tasks as Cyber Security Engineer, IT Security Analyst, and Cyber Security Analyst. course 2 Basic Cryptography and Programming with Crypto API: About this course: In this MOOC, we will learn the basic concepts and principles of cryptography, apply basic cryptoanalysis to decrypt messages encrypted with mono-alphabetic substitution cipher, and discuss the strongest encryption technique of the one-time-pad and related quantum key distribution systems. We will also learn the efficient symmetric key cryptography algorithms for encrypting data, discuss the DES and AES standards, study the criteria for selecting AES standard, present the block cipher operating modes and discuss how they can prevent and detect the block swapping attacks, and examine how to defend against replay attacks. We will learn the Diffie-Hellman Symmetric Key Exchange Protocol to generate a symmetric key for two parties to communicate over insecure channel. We will learn the modular arithmetic and the Euler Totient Theorem to appreciate the RSA Asymmetric Crypto Algorithm, and use OpenSSL utility to realize the basic operations of RSA Crypto Algorithm. Armed with these knowledge, we learn how to use PHP Crypto API to write secure programs for encrypting and decrypting documents and for signing and verify documents. We then apply these techniques to enhance the registration process of a web site which ensures the account created is actually requested by the owner of the email account. Module 1 - Basic Cryptography In this module we learn the basic concepts and principles of crytography, introduce the basic concept of cryptoanalysis using mono-alphabetic substitution cipher as an example, and discuss the one-time-pad and quantum key distribution concepts. Learning Objectives • Compose secure program with Crypto API for encryption, authentication, and integrity checking • Understand terminologies of basic cryptography • Understand Kerchhoff Principle • Apply cryptoanalysis techniques on mono-alphabetic ciphers • Explain why one time pad is strongest and understand how quantum key can be distributed
Views: 151 intrigano
In this video we talk with Cody Mercer from Malwarebytes https://malwarebytes.com about cryptography, the military, how he got to where he is, the advice he would give, and about Malwarebytes. This video was recorded at InfoSec World 2018 in Orlando Florida. Thank you to MIS|TI for organizing this show! https://infosecworld.misti.com/ -------- A+ Product and Other Certification Book recommendations:(affiliate link) https://www.amazon.com/shop/itcareerquestions Top Recommendations! CompTIA NET+ Guide to Troubleshooting: http://amzn.to/2oLnMmI (affiliate Link) CompTIA A+ All-in-One Exam: http://amzn.to/2FjaNyC (affiliate link) MCSA Server 2016 Study Guide: http://amzn.to/2Ff1tQw (affiliate link) MCSA SQL 2016 Study Guide: http://amzn.to/2FXqCMR (affiliate link) MTA OS Fundamentals: http://amzn.to/2FjOvNm (affiliate link) CCENT Official Cert Guide: http://amzn.to/2FkcQT8 (affiliate link) CCNA Routing & Switching: http://amzn.to/2oMv2id (affiliate link) I.T. Career Questions/Zach Talks Tech Merchandise: https://teespring.com/stores/it-career-questions -------- The equipment used in this video is as follows(Affiliate links below) Sony a9(Main Camera): http://amzn.to/2EjWbQc Sony a7(Second/Backup Camera): http://amzn.to/2xQrcpY Google Pixel 2 XL(Side Camera): https://store.google.com/us/product/pixel_phone?hl=en-US Zoom H1 Digital Recorder: http://amzn.to/2zlEA6v Giant Squid Microphone: http://amzn.to/2zl6WxK Flexispot 47" Sit Stand Desk: http://amzn.to/2gviP0x NanoLeaf LED Lights: https://us-shop.nanoleaf.me?rfsn=815333.867f4&utm_source=refersion&utm_medium=affiliate&utm_campaign=815333.867f4 -------- Thank you for visiting my YouTube channel. Facebook: https://www.facebook.com/pcsimplest Twitter: https://twitter.com/pcsimplest Website: http://www.itcareerquestions.com Information Systems: http://www.informationsystems.net
Views: 835 I.T. Career Questions
Views: 2413 Study Fever
Multi-Engine Class Rating Instructor – Asymmetric Lesson One
Views: 533 Aviation Training Resources UK
Top 10 facts about Cyber Security On number 10 there is Cryptography A Cryptography involves creating written or generated codes that allows information to be kept secret. Cryptography converts data into a format that is unreadable for an unauthorized user, allowing it to be transmitted without anyone decoding it back into a readable format, thus compromising the data. On number 9 there is Data Breach A data breach is an incident that involves the unauthorized or illegal viewing, access or retrieval of data by an individual, application or service. It is a type of security breach specifically designed to steal and/or publish data to an unsecured or illegal location. A data breach is also known as a data spill or data leak. On number 8 there is Backdoor A backdoor is a technique in which a system security mechanism is bypassed undetectably to access a computer or its data. The backdoor access method is sometimes written by the programmer who develops a program. A backdoor is also known as a trapdoor. On number 7 there is Encryption Encryption is the process using an algorithm for tagging information to make it unreadable for unauthorized users. This cryptographic method protects sensitive data such as credit card numbers by encoding and transforming information into unreadable cipher text. This encoded data may only be decrypted or made readable with a key. Symmetric-key and asymmetric-key are the two primary types of encryption. On number 6 there is honeypot A honeypot is a decoy computer system for trapping hackers or tracking unconventional or new hacking methods. Honeypots are designed to purposely engage and deceive hackers and identify malicious activities performed over the Internet. Multiple honeypots can be set on a network to form a honeynet. On number 5 there is Crudware A Crudware is a type of freeware and software marketing tactic in which large quantities of beta, trial, freeware or limited software versions are freely distributed or promoted on websites, social networks and related online communities. Crudware is used to lure and motivate prospective customers into purchasing a complete or paid version of the software, or even malware. On number 4 there is Vulnerability A vulnerability is a cyber-security term that refers to a flaw in a system that can leave it open to attack. Vulnerability may also refer to any type of weakness in a computer system itself, in a set of procedures, or in anything that leaves information security exposed to a threat. On number 3 there is Hacktivism A Hacktivism is the act of hacking a website or computer network in an effort to convey a social or political message. The person who carries out the act of hacktivism is known as a hacktivist. On number 2 there is Firewall A firewall is software used to maintain the security of a private network. Firewalls block unauthorized access to or from private networks and are often employed to prevent unauthorized Web users or illicit software from gaining access to private networks connected to the Internet. A firewall may be implemented using hardware, software, or a combination of both. On number 1 there is Decryption A Decryption is the process of transforming data that has been rendered unreadable through encryption back to its unencrypted form. In decryption, the system extracts and converts the garbled data and transforms it into texts and images that are easily understood not only by the reader but also by the system. Decryption may be accomplished manually or automatically. It may also be performed with a set of keys or passwords. ▶DONT CLICK THIS - https://goo.gl/p9DRXs
Views: 1215 Insider Diary
Detailed overview of public/private key encryption and live demo of exactly how digital signatures work on Mac, combining public and private keys and hash functions. Welcome to episode 3 of my series on Blockchain/Bitcoin. I'm joined once again by my girlfriend Nadisha who is my classroom pupil... I build on the hash function concepts from the previous episode and explain the basic concepts public and private keys and how to use them to create digital signatures - a key part of the bitcoin infrastructure. We demonstrate in a Mac terminal how you can generate your own keys and encrypt and decrypt and sign your own resources - learning by doing always works. We touch on bitcoin addresses, what they represent and how they are created. Finally I go back for a refresh of the bitcoin blockchain browser and look at the first ever bitcoin transaction in the "Genesis Block" to show what a real bitcoin address looks like. Bitcoin Blockchain browser https://blockchain.info Online hash calculator - great way to practice and familiarise with hash functions - one of the most important building blocks of Blockchain/Bitcoin http://www.fileformat.info/tool/hash.htm Course to date (previous videos) 1. Blockchain introduction https://youtu.be/xwA2TkcAQgQ 2. Hashing, blockchain networks and look at blockchain browser https://youtu.be/oxwMnqFNq9M SAMPLE COMMANDS: You will need to use your own document - pick any document, obviously your hash values will be different to mine. Also I had to use (right arrow) - since comments do not allow "chevron" symbols # EXAMPLE 1: # generate public and private keys openssl genrsa -out mykey 2048; cp mykey privatekey; openssl rsa -in mykey -pubout -out publickey; rm mike #encrypt with public key echo “the cat sat on the mat” | openssl rsautl -encrypt -pubin -inkey publicly (right arrow) cipher.txt # show the garbage cat cipher.txt # decrypt with private key - The cat sat on the mat cat cipher.txt | openssl rsautl -decrypt -inkey privately # EXAMPLE 2: Sign Alice in wonderland #check the SHA256 hash of the document to send - d9db7b8984d808b2821070cc6cc76e4415229d3356452b2a0f06ec3608f13b6c shasum -a 256 alice-in-wonderland.txt | cut -d" " -f1 # create a text file called signature which hashes the document and encrypts with private key shasum -a 256 alice-in-wonderland.txt | cut -d" " -f1 | openssl rsautl -inkey privatekey -sign (right arrow) signature # wrap the signature up with the public key, the document and the signature and send it … we just copy to another folder tar -cvf alice.tar signature alice-in-wonderland.txt publickey;mkdir -p inbox;cp alice.tar inbox;cd inbox;tar -xvf alice.tar # inspect the public key and verify with the sender that it belongs to the sender cat publickey #decrypt the signature with the received public key - d9db7b8984d808b2821070cc6cc76e4415229d3356452b2a0f06ec3608f13b6c openssl rsautl -inkey publickey -pubin -in signature # hash the received document - d9db7b8984d808b2821070cc6cc76e4415229d3356452b2a0f06ec3608f13b6c shasum -a 256 alice-in-wonderland.txt | cut -d" " -f1 # if they are both the same then the document cannot have been changed since it was signed by the genuine owner of the # private key corresponding to the public key
Views: 19608 Matt Thomas
Learn more by visiting: http://cs.co/9008BLegI Join TechWiseTV host and International Man of Cryptography, Robb Boyd, for a whirlwind tour of next generation encryption (NGE). See how it strengthens security and improves efficiency by updating algorithms, key sizes, entropy sources and protocols. Learn how NGE can help you meet the security requirements of the next decade and work with new products that use NGE to meet scalability requirements.
Views: 3813 Cisco
This session will discuss the options available for encrypting data at rest and key management in AWS. It will focus on two primary scenarios: (1) AWS manages encryption keys on behalf of the customer to provide automated server-side encryption; (2) the customer manages their own encryption keys using partner solutions and/or AWS CloudHSM. Real-world customer examples will be presented to demonstrate adoption drivers of specific encryption technologies in AWS. Netflix Jason Chan will provide an overview of how NetFlix uses CloudHSM for secure key storage.
Views: 4909 Amazon Web Services
- We will learn the way #encryption & #decryption happens while Data at Rest in AWS. - Overview of AWS KMS service - Customer Master Key and types - AWS managed & Customer managed - Data Keys - Envelope Encryption - GenerateDataKey API usage READ -- https://docs.aws.amazon.com/kms/latest/developerguide/concepts.html ----------------------------------------------------------- I would request to look at our playlists to learn systematically for AWS Certifications --- Solutions Architect - https://www.youtube.com/watch?v=ywHFXfuJoSU&list=PLTyrc6mz8dg8YE7OpHYoaRILnf1RQM8bz &&& SysOps Administrator - https://www.youtube.com/watch?v=UFSH-KuDGj8&list=PLTyrc6mz8dg8grU1HEhVw4zoCyvAl5MBO ++++++++++++++++++++++++++++++++++++++++ SUBSCRIBE to our youtube channel - youtube.com/knowledgeindia I have answered lot of AWS Interview questions in LIVE sessions here -- https://www.youtube.com/playlist?list=PLTyrc6mz8dg_tEexS22k_gmssDmkWkEMd Connect with me on LinkedIn to read interesting AWS updates & Practical Scenario Questions --- https://www.linkedin.com/in/knowledgeindia Join our AWS Learning Group on LinkedIn - https://www.linkedin.com/groups/10389754 Don't miss any updates, please follow my FB page http://fb.me/AWStutorials & Twitter - http://twitter.com/#!/knowledge_india And for AWS exercises & case-studies, you can refer our blog -- https://aws-tutorials.blogspot.com/ ++++++++++++++++++++++++++++++++++++++++
Views: 2555 Knowledge India
This will be the second of six cryptography primer sessions exploring the basics of modern cryptography. In this session, we’ll explore symmetric ciphers, primitives, and protocols – including AES, cipher modes, hash functions, and message authentication. Subsequent sessions (on alternating Fridays) are expected to include the following topics. Depending on the interests of the participants, other topics may be included or substituted. • Integer asymmetric functions including BigNums, Diffie-Hellman, RSA, and DSA • Non-integer asymmetric functions including elliptic curves and lattice-based systems • Protocol properties including forward secrecy, crypto agility, and certificate management • Applications including zero-knowledge, secret sharing, homomorphic encryption, and election protocols
Views: 199 Microsoft Research
Audible free book: http://www.audible.com/computerphile Hashing Algorithms are used to ensure file authenticity, but how secure are they and why do they keep changing? Tom Scott hashes it out. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Pigeon Sound Effects courtesy of http://www.freesfx.co.uk/ Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 754321 Computerphile
A PKI (public key infrastructure) is often confused with a CA (certificate authority) but it is much more than that. A PKI includes all of the components required to enable the use of certificates. Because of this, it represents the attack surface an attacker can exploit when attempting to leverage certificates and keys in their attacks.
Views: 25254 Paul Turner
What is the difference between Public Key and Private Key? To see more videos: https://goo.gl/bG124K (*) Click CC, or you can find your subtitle: on the right of CC, click setting, click Subtitles/CC, choose your favorite! This video will explain to you what the difference between Public Key and Private Key is. Hope you will like it! Please subscribe to our channel for more info about Crypto World! Thank you! Follow us on Facebook: https://www.facebook.com/HBWalletETH Follow us on Twitter: https://twitter.com/HB_Wallet Check out our website: https://www.bacoor-vietnam.co/ HB Wallet is now available on App Store, Play Store, Mac OS, and Windows! Download NOW! Link to download: App Store: https://goo.gl/8M7fDR Play Store: https://goo.gl/SWwSDP Desktop: http://bacoor-vietnam.co/hb-desktop/
Views: 1844 HB Wallet
Automated Analysis of Cryptographic Assumptions in Generic Group Models by John C. Mitchell, Andre Scedrov, Dario Fiore, Gilles Barthe, Edvard Fagerholm, Benedikt Schmidt. Talk at Crypto 2014.
Views: 207 TheIACR
AES, DES, RSA, ECC -- there are so many ways to encrypt your data. Whether your company's protecting customer credit card information, securing remote user connections to your network or protecting your intellectual property from digital piracy, you're using encryption every day. But crypto can be intimidating to the uninitiated, and there are a daunting array of options. In the 1980s, there was only one real choice -- the Data Encryption Standard (DES). That's changed. Today, we have a broad selection of stronger, faster and better-designed algorithms. Now, the problem is to sort out the choices. But what's the difference? How do you know if you're buying industrial-strength protection or if your developers are choosing the right encryption algorithms for the job? Where do you begin to make sense of it all? Start right here. This primer will help you decipher the jumble of TLAs (three-letter acronyms) that define encryption basics that you need to know to pass the ISC2 CISSP exam. FOLLOW ME: Website: https://arecyber.com Twitter: https://twitter.com/artofwar73 Facebook: @arecyberllc Instagram: https://www.instagram.com/arecyberllc Visualize Success and you will Succeed! -~-~~-~~~-~~-~- Please watch: "How To Pass The CISSP" https://www.youtube.com/watch?v=Qw8sYsO153s -~-~~-~~~-~~-~-
Views: 518 ARECyber LLC
Certificates are used to prove identity and used for creating secure communication. Check out http://itfreetraining.com for more of our always free training videos. This video looks at how a certificate works, what is a certificate and how they are used for identification and secure communication. Download the PDF handout http://itfreetraining.com/Handouts/Certificates/WhatAreCertificates.pdf What is a certificate? A certificate is an electronic document that contains data fields. When compared to a traditional paper certificate there are some similarities between an electronic certificate and a physical certificate. Digital certificates like a physical certificate are issued by an authority. For example, a university may issue a certificate to a student to show that they have completed the necessary work in order to graduate. The next question is, would you trust a physically certificate? Digital certificates work the same way. They are issued from an authority and the question becomes would you trust the authority that issued the certificate? Electronic certificates also contain other fields like who or what the certificate was issued to, how long it is valid, the public key and the digital signature. If a digital certificate is presented to a user or computer, the user or computer is able to check the certificate to ensure the person using it should be using it. Also the certificate contains a digital signature which allows the certificate to be checked to make sure it has not been modified. Digital Signature A digital signature provides a method for a certificate to be checked to ensure it has not been modified. In order to do this, a hash value is created for the certificate. To generate a hash value the certificate is put through a function to create a single value. Hash functions are designed so different certificates will not produce the same value, however the hash value cannot be used to generate the original certificate. The same principal applies to a person's fingerprints. They can be used to identify a person, however using a finger print you could not work out the features of a person like what color hair they have. When a certificate is created, the hash value for that certificate is also created. Using a function involving the private key, a digital signature is created and added to the certificate. Digital Signature Example When a certificate is used, in order to check the certificate has not been changed, the following is done: The computer generates the hash value for the certificate. Next, the digital signature is put through a function using the public key which should result in the same hash value. If both values match, the certificate has not been modified. This prevents a 3rd party taking a certificate, changing the values in the certificate and using the certificate. Trust Model Certificates work off a trust model. An example of a trust model in computers is that a computer may have a sticker on it indicating which operating systems it will run. The consumer, seeing this sticker, must trust that the manufacture would not put this sticker on the laptop unless it will run that operating system. The customer must also trust the creator of that operating system would not allow a computer manufacturer to put a sticker on a computer that would not run that operating system. Certificate Trust Model Certificates are generally deployed in a hierarchy. At the top is the root certificate authority. This can be an internal Certificate Authority or an external authority like VeriSign. When an authority like VeriSign issues a certificate, they will perform a number of checks on the individual purchasing the certificate to ensure that they are a valid business. When a certificate is used it can be checked to see which authority issued that certificate. In order for the certificate to be used, the computer must trust the authority that it was issued from. Authorities like VeriSign are trusted by default on most operating systems. Certificate Error If a certificate is presented to the computer and it is not trusted, the computer will generate an error asking if the users want to trust the certificate. It is up to the user to decide if they believe the certificate is valid. Certificate Hierarchy Certificates use a hierarchy. At the top is the root CA, below these are subordinate CA's. Any level can issue certificates to subordinate CA's or direct to users, computers or devices. If the user, computer or device trusts the root CA, then any certificate that is issued by any CA in the hierarchy will automatically be trusted and thus used by the client. References "MCTS 70-640 Configuring Windows Server 2008 Active Directory Second edition" pg 771-775 "Public key certificate" http://en.wikipedia.org/wiki/Public_key_certificate
Views: 480260 itfreetraining
Encryption Facts Symmetric encryption uses the identical key to both encrypt and decrypt the data. Asymmetric encryption uses two related keys (public and private) for data encryption and decryption, and takes away the security risk of key sharing. The RSA algorithm encryption and authentication method is the most commonly used encryption method. This video has been brought to you by JSCAPE. As a leading provider of managed file transfer software and networking solutions to businesses and government agencies in more than 54 countries worldwide, JSCAPE provides secure, seamless and reliable file transfer systems for data delivery that meet a variety of audit and regulatory requirements.
Views: 28 J Scape
Sensitive customer data needs to be protected throughout AWS. This session discusses the options available for encrypting data at rest in AWS. It focuses on several scenarios, including transparent AWS management of encryption keys on behalf of the customer to provide automated server-side encryption and customer key management using partner solutions or AWS CloudHSM. This session is helpful for anyone interested in protecting data stored in AWS.
Views: 39811 Amazon Web Services
Security+ Training Course Index: http://professormesser.link/sy0401 Professor Messer’s Course Notes: http://professormesser.link/sy0401cn Frequently Asked Questions: http://professormesser.link/faq - - - - - An encryption key may need to be revoked for many reasons. In this video, you’ll learn about automated key revocation and how to revoke keys in a web-of-trust. - - - - - Download entire video course: http://professormesser.link/401adyt Get the course on MP3 audio: http://professormesser.link/401vdyt Subscribe to get the latest videos: http://professormesser.link/yt Calendar of live events: http://www.professormesser.com/calendar/ FOLLOW PROFESSOR MESSER: Professor Messer official website: http://www.professormesser.com/ Twitter: http://www.professormesser.com/twitter Facebook: http://www.professormesser.com/facebook Instagram: http://www.professormesser.com/instagram Google +: http://www.professormesser.com/googleplus
Views: 18714 Professor Messer