RSA Public Key Encryption Algorithm (cryptography). How & why it works. Introduces Euler's Theorem, Euler's Phi function, prime factorization, modular exponentiation & time complexity.
Link to factoring graph: http://www.khanacademy.org/labs/explorations/time-complexity

Views: 558992
Art of the Problem

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: 472087
itfreetraining

The history behind public key cryptography & the Diffie-Hellman key exchange algorithm.
We also have a video on RSA here: https://www.youtube.com/watch?v=wXB-V_Keiu8

Views: 622012
Art of the Problem

This video explains to you how PKI works to create a secure environment.

Views: 82626
SecureMetric

How does public-key cryptography work? What is a private key and a public key? Why is asymmetric encryption different from symmetric encryption? I'll explain all of these in plain English!
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Simply Explained - Savjee

This Algorithm is used to exchange the secret /symmetric key between sender and receiver.
This exchange of key can be done with the help of public key and private key
step 1 Assume prime number p
step 2 Select a such that a is primitive root of p and a less than p
step 3 Assume XA private key of user A
step 4 Calculate YA public key of user A with the help of formula
step 5 Assume XB private key of user B
step 6 Calculate YB public key of user B with the help of formula
step 7 Generate K secret Key using YB and XA with the help of formula at Sender side.
step 8 Generate K secret Key using YA and XB with the help of formula at Receiver side.

Views: 59678
Sundeep Saradhi Kanthety

What is PUBLIC-KEY CRYPTOGRAPHY? What does PUBLIC-KEY CRYPTOGRAPHY mean? PUBLIC-KEY CRYPTOGRAPHY meaning - PUBLIC-KEY CRYPTOGRAPHY definition - PUBLIC-KEY CRYPTOGRAPHY explanation.
Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.
Public-key cryptography, or asymmetric cryptography, is any cryptographic system that uses pairs of keys: public keys that may be disseminated widely paired with private keys which are known only to the owner. There are two functions that can be achieved: using a public key to authenticate that a message originated with a holder of the paired private key; or encrypting a message with a public key to ensure that only the holder of the paired private key can decrypt it.
In a public-key encryption system, any person can encrypt a message using the public key of the receiver, but such a message can be decrypted only with the receiver's private key. For this to work it must be computationally easy for a user to generate a public and private key-pair to be used for encryption and decryption. The strength of a public-key cryptography system relies on the degree of difficulty (computational impracticality) for a properly generated private key to be determined from its corresponding public key. Security then depends only on keeping the private key private, and the public key may be published without compromising security.
Public-key cryptography systems often rely on cryptographic algorithms based on mathematical problems that currently admit no efficient solution—particularly those inherent in certain integer factorization, discrete logarithm, and elliptic curve relationships. Public key algorithms, unlike symmetric key algorithms, do not require a secure channel for the initial exchange of one (or more) secret keys between the parties.
Because of the computational complexity of asymmetric encryption, it is usually used only for small blocks of data, typically the transfer of a symmetric encryption key (e.g. a session key). This symmetric key is then used to encrypt the rest of the potentially long message sequence. The symmetric encryption/decryption is based on simpler algorithms and is much faster.
Message authentication involves hashing the message to produce a "digest," and encrypting the digest with the private key to produce a digital signature. Thereafter anyone can verify this signature by (1) computing the hash of the message, (2) decrypting the signature with the signer's public key, and (3) comparing the computed digest with the decrypted digest. Equality between the digests confirms the message is unmodified since it was signed, and that the signer, and no one else, intentionally performed the signature operation — presuming the signer's private key has remained secret. The security of such procedure depends on a hash algorithm of such quality that it is computationally impossible to alter or find a substitute message that produces the same digest - but studies have shown that even with the MD5 and SHA-1 algorithms, producing an altered or substitute message is not impossible. The current hashing standard for encryption is SHA-2. The message itself can also be used in place of the digest.
Public-key algorithms are fundamental security ingredients in cryptosystems, applications and protocols. They underpin various Internet standards, such as Transport Layer Security (TLS), S/MIME, PGP, and GPG. Some public key algorithms provide key distribution and secrecy (e.g., Diffie–Hellman key exchange), some provide digital signatures (e.g., Digital Signature Algorithm), and some provide both (e.g., RSA).
Public-key cryptography finds application in, among others, the information technology security discipline, information security. Information security (IS) is concerned with all aspects of protecting electronic information assets against security threats. Public-key cryptography is used as a method of assuring the confidentiality, authenticity and non-repudiability of electronic communications and data storage.

Views: 815
The Audiopedia

Views: 846223
dtommy1979

OCR Specification Reference
A Level 1.3.1c
Why do we disable comments? We want to ensure these videos are always appropriate to use in the classroom. However, we value your feedback, and are happy to consider amendments due to inaccuracies. Please get in touch with us directly at: [email protected]
For full support and additional material please visit our web site http://craigndave.org

Views: 7470
craigndave

What is ID-BASED CRYPTOGRAPHY? What does ID-BASED CRYPTOGRAPHY mean? ID-BASED CRYPTOGRAPHY meaning - ID-BASED CRYPTOGRAPHY definition - ID-BASED CRYPTOGRAPHY explanation.
Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.
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Identity-based cryptography is a type of public-key cryptography in which a publicly known string representing an individual or organization is used as a public key. The public string could include an email address, domain name, or a physical IP address.
The first implementation of identity-based signatures and an email-address based public-key infrastructure (PKI) was developed by Adi Shamir in 1984, which allowed users to verify digital signatures using only public information such as the user's identifier. Under Shamir's scheme, a trusted third party would deliver the private key to the user after verification of the user's identity, with verification essentially the same as that required for issuing a certificate in a typical PKI.
Shamir similarly proposed identity-based encryption, which appeared particularly attractive since there was no need to acquire an identity's public key prior to encryption. However, he was unable to come up with a concrete solution, and identity-based encryption remained an open problem for many years. The first practical implementations were finally devised by Sakai in 2000, and Boneh and Franklin in 2001. These solutions were based on bilinear pairings. Also in 2001, a solution was developed independently by Clifford Cocks.
Identity-based systems allow any party to generate a public key from a known identity value such as an ASCII string. A trusted third party, called the private key generator (PKG), generates the corresponding private keys. To operate, the PKG first publishes a master public key, and retains the corresponding master private key (referred to as master key). Given the master public key, any party can compute a public key corresponding to the identity ID by combining the master public key with the identity value. To obtain a corresponding private key, the party authorized to use the identity ID contacts the PKG, which uses the master private key to generate the private key for identity ID.
Identity-based systems have a characteristic problem in operation. Suppose Alice and Bob are users of such a system. Since the information needed to find Alice's public key is completely determined by Alice's ID and the master public key, it is not possible to revoke Alice's credentials and issue new credentials without either (a) changing Alice's ID (usually a phone number or an email address which will appear in a corporate directory); or (b) changing the master public key and re-issusing private keys to all users, including Bob.
This limitation may be overcome by including a time component (e.g. the current month) in the identity.

Views: 303
The Audiopedia

Two Categories of attacks
1) Passive Attacks
a) Release of the content
b) Traffic Analysis
2) Active Attacks
a) Masquerade
b) Replay
c) Modification of Message
d) Denial of Service

Views: 107814
Sundeep Saradhi Kanthety

How do we exchange a secret key in the clear? Spoiler: We don't - Dr Mike Pound shows us exactly what happens.
Mathematics bit: https://youtu.be/Yjrfm_oRO0w
Computing Limit: https://youtu.be/jv2H9fp9dT8
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This video was filmed and edited by Sean Riley.
Computer Science at the University of Nottingham: https://bit.ly/nottscomputer
Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

Views: 207839
Computerphile

In this video it is easily explained how to find mode
And formulaes of rsa
As well as diffie-hellman
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rsa algorithm
rsa algorithm in network security
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Views: 81005
Well Academy

The FBI is currently in a battle with Apple to allow encrypted phones be unlocked, but how does encryption even work?
How Powerful Is Apple? ►►►► http://bit.ly/1OBOqRk
Sign Up For The TestTube Newsletter Here ►►►► http://bit.ly/1myXbFG
How Secure Are Fingerprint Scanners? ►►►►http://bit.ly/1R7K5qX
Read More:
ADVANCED ENCRYPTION STANDARD (AES)
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
"The Advanced Encryption Standard (AES) specifies a FIPS-approved cryptographic algorithm that can be used to protect electronic data. The AES algorithm is a symmetric block cipher that can encrypt (encipher) and decrypt (decipher) information."
"This standard may be used by Federal departments and agencies when an agency determines that sensitive (unclassified) information"
Analysis of Avalanche Effect in Plaintext of DES using Binary Codes
http://www.ijettcs.org/Volume1Issue3/IJETTCS-2012-10-25-097.pdf
"Cryptography provides a method for securing and authenticating the transmission of information across insecure communication channels."
"Symmetric keys encryption or secret key encryption identical key is used by sender and receiver."
"Data can be recovered from cipher only by using exactly the same key used to encipher it."
Advanced Encryption Standard (AES)
http://searchsecurity.techtarget.com/definition/Advanced-Encryption-Standard
"The Advanced Encryption Standard became effective as a federal government standard in 2002"
"ES is one of the Suite B cryptographic algorithms used by NSA's Information Assurance Directorate in technology approved for protecting national security systems."
iOS Security
http://www.apple.com/business/docs/iOS_Security_Guide.pdf#page=12
"On mobile devices, speed and power efficiency are critical. Cryptographic operations are complex and can introduce performance or battery life problems if not designed and implemented with these priorities in mind."
"Every iOS device has a dedicated AES 256 crypto engine built into the DMA path between the flash storage and main system memory, making file encryption highly efficient"
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Views: 328053
Seeker

Mia Epner, who works on security for a US national intelligence agency, explains how cryptography allows for the secure transfer of data online. This educational video explains 256 bit encryption, public and private keys, SSL & TLS and HTTPS.
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Views: 217692
Code.org

This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459

Views: 54458
Udacity

A simple explanation of how prime numbers are used in Public Key Cryptography from ABC1 science program Catalyst

Views: 62668
Simon Pampena

Public-key cryptography, also known as asymmetric cryptography, is a class of cryptographic algorithms which require two separate keys, one of which is secret (or private) and one of which is public. Although different, the two parts of this key pair are mathematically linked. The public key is used to encrypt plaintext or to verify a digital signature; whereas the private key is used to decrypt ciphertext or to create a digital signature. The term "asymmetric" stems from the use of different keys to perform these opposite functions, each the inverse of the other -- as contrasted with conventional ("symmetric") cryptography which relies on the same key to perform both.
Public-key algorithms are based on mathematical problems which currently admit no efficient solution that are inherent in certain integer factorization, discrete logarithm, and elliptic curve relationships. It is computationally easy for a user to generate their own public and private key-pair and to use them for encryption and decryption. The strength lies in the fact that it is "impossible" (computationally infeasible) for a properly generated private key to be determined from its corresponding public key. Thus the public key may be published without compromising security, whereas the private key must not be revealed to anyone not authorized to read messages or perform digital signatures. Public key algorithms, unlike symmetric key algorithms, do not require a secure initial exchange of one (or more) secret keys between the parties.
This video is targeted to blind users.
Attribution:
Article text available under CC-BY-SA
Creative Commons image source in video

Views: 762
Audiopedia

This video explains why key exchange is an issue in cryptography and introduces Diffie-Hellman's solution to this problem.
NB : This video was created as a part of an assignment. It is heavily influenced from another youtube video which you can find here https://www.youtube.com/watch?v=YEBfamv-_do

Views: 47674
Bishal Sapkota

What is PKI (Public Key Infrastructure)?
Discover what you need to know about the level of security PKI provides, how easy it is to implement and how convenient it is for users.
Public key infrastructures (PKIs) are relied upon to secure a broad range of digital applications, validating everything from transactions and identities to supply chains. However, infrastructure vulnerabilities represent a significant risk to the organizations that rely on PKI alone to safeguard digital applications.
Gemalto offers PKI encryption key management solutions to help you protect the keys at the heart of PKI as well as PKI-based authentication tokens that leverage the security benefits offered by PKI to deliver dependable identity protection
Watch and learn how PKI can benefit you and your organization.
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Our solutions: https://safenet.gemalto.com/data-protection/pki-security-solutions/

Views: 23707
Gemalto Security

find relevant notes at-https://viden.io/

Views: 60115
LearnEveryone

DES algorithm follows the Feistel Structure
Most of the Block cipher algorithms follows Feistel Structure
BLOCK SIZE - 64 bits Plain Text
No. of Rounds - 16 Rounds
Key Size - 64 bits
Sub Key Size - 48 bits
No. of Sub Keys - 16 Sub Keys
Cipher Text - 64 bits

Views: 145776
Sundeep Saradhi Kanthety

Diffie Hellman Key Exchange in Hindi for Symmetric Key Encryption System – With Example
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Views: 50169
Easy Engineering Classes

This video explains how the elgama cryptosystem encryption and decryption is done 😎😎
Visit Our Channel :- https://www.youtube.com/channel/UCxik...
In this lecture we have taught about Diffie Hellman Key Exchange and how it operates. Also a quick overview of AES and the basics of encryption.
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Views: 29747
Quick Trixx

How SSL works by leadingcoder.
This is a full tutorial how to setup SSL that requires client certificate for reference: http://www.windowsecurity.com/articles/Client-Certificate-Authentication-IIS6.html .

Views: 1397666
tubewar

Public key encryption (PKE) allows parties that had never met in advance to communicate over an unsafe channel. The notion was conceived in the 1970s, followed by the discovery that one could provide formal definitions of security for this and other cryptographic problems, and that such definitions were achievable by assuming the hardness of some computational problem (e.g., factoring large numbers). For PKE, the most basic security definition -- semantic security -- guarantees privacy, namely that it is infeasible to learn anything about the plaintext from its encryption. However, as cryptographic applications grew more sophisticated, this level of security is often not sufficient, since it does not protect against active attacks arising in networked environments. In this talk I will review some of my work aimed at achieving stronger security notions for public key encryption, including protections against adaptive corruptions, man-in-the-middle attacks (non-malleability), chosen ciphertext security, and, if time allows, tampering attacks. The emphasis of this line of work is on achieving the stronger notion from as general an assumption as possible (e.g., directly from semantically secure PKE), as well as achieving a black box construction, namely using the underlying scheme as a subroutine, without assuming it has any special structure or algebraic properties. This allows for more efficient cryptosystems that can be instantiated with a larger set of assumptions. Based on several joint works with different coauthors. The main part of the talk will be based on joint works with Seung Geol Choi, Dana Dachman-Soled, and Hoeteck Wee.

Views: 84
Microsoft Research

For more detail on back substitution go to: http://bit.ly/1W5zJ2g
Here is a link with help on relative primes: http://www.mathsisfun.com/definitions/relatively-prime.html
This is (hopefully) a very simple example of how to calculate RSA public and private keys. Just to be clear: these values should not be used for any real encryption purposes.

Views: 121258
Jenn Janesko

The complete YouTube playlist can be viewed here: https://goo.gl/mjyDev
This lesson explains the concept of the Elliptic Curve Cryptography(ECC), under the course, "Cryptography and Network Security for GATE Computer Science Engineering".
The lesson explains the questions on the following subtopics:
Elliptic Curve Cryptography(ECC)
ECC - Public key cryptosystem
ECC - Key Exchange
ECC - Encryption and Decryption
Elliptic curve
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.
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Elliptic Curve Cryptography(ECC) - GATE Computer Science - Unacademy

Views: 12676
Unacademy - GATE Preparation

Public-key cryptography, also known as asymmetric cryptography, is a class of cryptographic algorithms which require two separate keys, one of which is secret and one of which is public. Although different, the two parts of this key pair are mathematically linked. The public key is used to encrypt plaintext or to verify a digital signature; whereas the private key is used to decrypt ciphertext or to create a digital signature. The term "asymmetric" stems from the use of different keys to perform these opposite functions, each the inverse of the other -- as contrasted with conventional cryptography which relies on the same key to perform both.
This video targeted to blind users.
Attribution:
Article text available under CC-BY-SA
Public domain image source in video

Views: 2097
encyclopediacc

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: 484181
itfreetraining

This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.

Views: 13468
Udacity

We will look at a collection of mathematical problems suggested by side-channel attacks against public key cryptosystems, and how the techniques inspired by this work relate to a variety of different applications. First, we discuss the cold boot attack, a side-channel attack against disk encryption systems that uses the phenomenon of DRAM remanence to recover encryption keys from a running computer. In the course of the attack, however, there may be errors introduced in the keys that the attacker obtains. It turns out that the structure of the key data in an AES key schedule can allow an attacker to more efficiently recover the private key in the presence of such errors. We extend this idea to a RSA private keys, and show how the structure of RSA private key data can allow an attacker to recover a key in the presence of random errors from 27 of the bits of the original key. Most previous work on RSA key recovery used the lattice-based techniques introduced by Coppersmith for finding low-degree roots of polynomials modulo numbers of unknown factorization. We will show how powerful analogies from algebraic number theory allow us to translate this theorem from the ring of integers to the ring of polynomials and beyond. This sort of intellectual arbitrage allows us to give a faster algorithm for list decoding of Reed-Solomon codes along with a natural extension to multi-point algebraic geometric codes, as well as an algorithm to find small solutions to polynomials over ideals in number fields.

Views: 1090
Microsoft Research

Supplement to the cryptocurrency video: How hard is it to find a 256-bit hash just by guessing and checking? What kind of computer would that take?
Cryptocurrency video: https://youtu.be/bBC-nXj3Ng4
Thread for Q&A questions: http://3b1b.co/questions
Several people have commented about how 2^256 would be the maximum number of attempts, not the average. This depends on the thing being attempted. If it's guessing a private key, you are correct, but for something like guessing which input to a hash function gives a desired output (as in bitcoin mining, for example), which is the kind of thing I had in mind here, 2^256 would indeed be the average number of attempts needed, at least for a true cryptographic hash function. Think of rolling a die until you get a 6, how many rolls do you need to make, on average?
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3Blue1Brown

To get this project in ONLINE or through TRAINING Sessions, Contact:JP INFOTECH, Old No.31, New No.86, 1st Floor, 1st Avenue, Ashok Pillar, Chennai -83.
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An Efficient Certificateless Encryption for Secure Data Sharing in Public Cloud in java
We propose a mediated certificateless encryption scheme without pairing operations for securely sharing sensitive information in public clouds. Mediated certificateless public key encryption (mCL-PKE) solves the key escrow problem in identity based encryption and certificate revocation problem in public key cryptography. However, existing mCL-PKE schemes are either inefficient because of the use of expensive pairing operations or vulnerable against partial decryption attacks. In order to address the performance and security issues, in this paper, we first propose a mCL-PKE scheme without using pairing operations. We apply our mCL-PKE scheme to construct a practical solution to the problem of sharing sensitive information in public clouds. The cloud is employed as a secure storage as well as a key generation center. In our system, the data owner encrypts the sensitive data using the cloud generated users’ public keys based on its access control policies and uploads the encrypted data to the cloud. Upon successful authorization, the cloud partially decrypts the encrypted data for the users. The users subsequently fully decrypt the partially decrypted data using their private keys. The confidentiality of the content and the keys is preserved with respect to the cloud, because the cloud cannot fully decrypt the information. We also propose an extension to the above approach to improve the efficiency of encryption at the data owner. We implement our mCL-PKE scheme and the overall cloud based system, and evaluates its security and performance. Our results show that our schemes are efficient and practical.

Views: 894
jpinfotechprojects

This video lecture is produced by S. Saurabh. He is B.Tech from IIT and MS from USA.
Lecture Slides: Computer Networks A Top Down Approach by Jim Kurose and Ross
Certification authority (CA)
Digital Certificate
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certificate authority server
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To learn C programming from IITian S.Saurabh visit
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Views: 29152
saurabhschool

ABSTRACT:The mediated certificateless encryption (mCL-PKE) scheme solves the key escrow problem and certificate revocation problem. mCL-PKE scheme does not utilize pairing operations. Since most CL-PKC schemes are based on bilinear pairing and are computationally expensive. The security mediator acts as a policy enforcement point as well and supports instantaneous revocation of compromised or malicious users. It is more efficient than the pairing based scheme. By applying mCL-PKE scheme can construct a practical solution to the problem of sharing sensitive information in the public clouds.

Views: 320
Rakesh G

Introduction to Cryptography - I
=====================
Materials (video, slides, english subtitles) from / Stanford Introduction to Cryptography
Slides & Subtitle Link:
http://www.mediafire.com/file/rr8pnxag9kpe3g7/Crypto-I.rar/file
About this Course:
Cryptography is an indispensable tool for protecting information in computer systems. In this course you will learn the inner workings of cryptographic systems and how to correctly use them in real-world applications. The course begins with a detailed discussion of how two parties who have a shared secret key can communicate securely when a powerful adversary eavesdrops and tampers with traffic. We will examine many deployed protocols and analyze mistakes in existing systems. The second half of the course discusses public-key techniques that let two parties generate a shared secret key. Throughout the course participants will be exposed to many exciting open problems in the field and work on fun (optional) programming projects. In a second course (Crypto II) we will cover more advanced cryptographic tasks such as zero-knowledge, privacy mechanisms, and other forms of encryption.
SKILLS YOU WILL GAIN During the 66 Video in this Course:
1 - Cryptography,
2 - Cryptographic Attacks,
3 - Public-Key Cryptography,
4 - Symmetric-Key Algorithm,

Views: 27
TO Courses

AES algorithm is the Block Cipher Symmetric Algorithm
Block Size is 128 bits
Key Size is 128 bits ( 4 words or 16 Bytes )
Sub Key Size is 1 Word (32 bit)
Number of Sub keys 44 Words
Number of Rounds 10
Cipher Text Size is 128 bits

Views: 87645
Sundeep Saradhi Kanthety

Introduction to Cryptography - I
=====================
Materials (video, slides, english subtitles) from / Stanford Introduction to Cryptography
Slides & Subtitle Link:
http://www.mediafire.com/file/rr8pnxag9kpe3g7/Crypto-I.rar/file
About this Course:
Cryptography is an indispensable tool for protecting information in computer systems. In this course you will learn the inner workings of cryptographic systems and how to correctly use them in real-world applications. The course begins with a detailed discussion of how two parties who have a shared secret key can communicate securely when a powerful adversary eavesdrops and tampers with traffic. We will examine many deployed protocols and analyze mistakes in existing systems. The second half of the course discusses public-key techniques that let two parties generate a shared secret key. Throughout the course participants will be exposed to many exciting open problems in the field and work on fun (optional) programming projects. In a second course (Crypto II) we will cover more advanced cryptographic tasks such as zero-knowledge, privacy mechanisms, and other forms of encryption.
SKILLS YOU WILL GAIN During the 66 Video in this Course:
1 - Cryptography,
2 - Cryptographic Attacks,
3 - Public-Key Cryptography,
4 - Symmetric-Key Algorithm,

Views: 22
TO Courses

Take the Full Course of Cryptography and Network Security
What we Provide
1) 20 Videos (Index is given down) + More Update will be Coming Before final exams
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3)Strategy to Score Good Marks in Cryptography and Network Scurity
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Sample Notes : https://goo.gl/Ze1FpX
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Cryptography and System Security Index
Lecture 1 Introduction to Cryptography and Security System
Lecture 2 Security Goals and Mechanism
Lecture 3 Symmetric Cipher
Lecture 4 Substitution Cipher
Lecture 5 Transposition Cipher
Lecture 6 Stream and Block Cipher
Lecture 7 Mono Alphabetic Cipher
Lecture 8 Poly Alphabetic Cipher
Lecture 9 Diffie Hellman
Lecture 10 RSA Algorithm with Solved Example
Lecture 11 IDEA Algorithm Full Working
Lecture 12 SHA-1 Algorithm Full Working
Lecture 13 Blowfish Algorithm Full working
Lecture 14 DES Algorithm Full Working
Lecture 15 Confusion and Diffusion
Lecture 16 AES Algorithm Full working
Lecture 17 Kerberos
Lecture 18 Malicious Software ( Virus and worms )
Lecture 19 DOS and DDOS Attack
Lecture 20 Digital Signature Full working Explained
More videos Coming Soon.

Views: 122943
Last moment tuitions

Friends, in todays video I give you explaination of What is Bitcoin in simple hindi language. I cover the basics here which will make you understand what is Bitcoin and How does bitcoin work. I also tell you about how you can get Bitcoin address and trade in Bitcoins. Hopefully this video will help you to understand Bitcoin Ecosystem further. I also touch upon Bitcoin Exchanges and wallets. Please keep in mind that these are Bitcoin basics and if you want to know more, do let us in comments section with hashtag #AskArun
If you like the video please make sure you like it, and if you have not subscribed, please do so right away!
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Doston, aaj ke video mein maine apko explain kartaa hoon ki Bitcoin kya hai aur voh bhi simple hindi language mein. Mein Bitcoin ke basics cover karta hoon jiski vajah se apko samajh jayega ki Bitcoin kaam kaise kartaa hai. Video mein maine ye bhi samjhata hoon ki aap bitcoin ka address kaise le sakte hai aur uske saath aap kaise trade bhi kar sakenge. Asha kartaa hoon ki is video ki vajah se apko samajh mein aa jayega ki Bitcoin kaise kaam kartaa hai. Bitcoin Exchanges aur Bitcoin Wallets ke barein mein bhi explanation is video mein di gayi hai. Doston, yaad rakhiye agar apko Bitcoin ke barein mein aur kuch sawal hai toh humein comments section mein jaroor poochiyega lekin #AskArun hashtag use karna mat bhooliye
आपको अगर कोई सवाल है तोह जरूर कमैंट्स में हमें बताईये - अगर वीडियो अच्छा लगा तोह लिखे और सब्सक्राइब जरूर कीजियेगा
Video Highlights
***************************************************************
00:20 - Bitcoin Introduction hindi
00:49 - What is Bitcoin?
01:06 - When can you use Bitcoin?
01:32 - How to get Bitcoin?
02:03 - Bitcoin transaction
02:50 - The Bitcoin fame
03:01 - Bitcoin's price
03:30 - Bitcoin Public and Private key
04:23 - Bitcoin mining
05:25 - Bitcoin exchanges and wallets
06:02 - Bitcoin verdict
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Views: 139626
Trakin Tech

This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459

Views: 55216
Udacity

A series following the greatest problems we face, from prehistoric through modern times.

Views: 37292
Art of the Problem

What is CERTIFICATE-BASED ENCRYPTION? What does CERTIFICATE-BASED ENCRYPTION mean? CERTIFICATE-BASED ENCRYPTION meaning - CERTIFICATE-BASED ENCRYPTION definition - CERTIFICATE-BASED ENCRYPTION explanation.
Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.
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Certificate-based encryption is a system in which a certificate authority uses ID-based cryptography to produce a certificate. This system gives the users both implicit and explicit certification, the certificate can be used as a conventional certificate (for signatures, etc.), but also implicitly for the purpose of encryption.
A user Alice can doubly encrypt a message using another user's (Bob) public key and his (Bob's) identity.
This means that the user (Bob) cannot decrypt it without a currently valid certificate and also that the certificate authority cannot decrypt the message as they don't have the user's private key (i.e., there is no implicit escrow as with ID-based cryptography, as the double encryption means they cannot decrypt it solely with the information they have).Certificate is the trust between two parties.
Key revocation can be added to the system by requiring a new certificate to be issued as frequently as the level of security requires. Because the certificate is "public information", it does not need to be transmitted over a secret channel. The downside of this is the requirement for regular communication between users and the certificate authority, which means the certificate authority is more vulnerable to electronic attacks (such as denial-of-service attacks) and also that such attacks could effectively stop the system from working. This risk can be partially but not completely reduced by having a hierarchy of multiple certificate authorities.
The best example of practical use of certificate-based encryption is Content Scrambling System (CSS), which is used to encode DVD movies in such a way as to make them playable only in a part of the world where they are sold. However, the fact that the region decryption key is stored on the hardware level in the DVD players substantially weakens this form of protection.

Views: 61
The Audiopedia

Video shows what cryptography means. The discipline concerned with communication security (eg, confidentiality of messages, integrity of messages, sender authentication, non-repudiation of messages, and many other related issues), regardless of the used medium such as pencil and paper or computers.. cryptography pronunciation. How to pronounce, definition by Wiktionary dictionary. cryptography meaning. Powered by MaryTTS

Views: 1398
SDictionary

Hashing Techniques Hash Function, Types of Hashing Techniques in Hindi and English
* Direct Hashing
* Modulo-Division Hashing
* Mid-Square Hashing
* Folding Hashing - Fold-Shift Hashing and Fold Boundary Hashing
* PseudoRandom Hashing
* Subtraction Hashing
For Students of B.Tech, B.E, MCA, BCA, B.Sc., M.Sc., Courses - As Per IP University Syllabus and Other Engineering Courses

Views: 227342
Easy Engineering Classes

A brief introduction to cloud data encryption and key management for the strongest data security and regulatory compliance available for businesses operating in private and public IaaS clouds.

Views: 2578
Porticor

Namaskaar Dosto, is video mein maine aapko firewall ke baare mein bataya hai, aap sabhi ne internet use karte time firewall ke baare mein jarur suna hoga, ab maine aapko bataya hai ki firewall kya hai? firewall kya kaam karta hai? aur aapko firewall ki kya jarurat hai? Dosto firewall ek security ki layer hai jo aapko computer ko protect karta hai malicious attacks se, yeh ek hardware bhi ho sakta hai, aur software bhi ho sakta hai, aur firewall ki madad se administration bhi kar sakte hai, kyuki jaise kisi country mein koi specific service agar government ko block karni hai toh bhi firewall kaam mein aata hai, aap yeh video dekhiye aur aapko pata chal jayega ki firewall kya hai, aur internet use karte time aapko firewall use karna kyu jaruri hai. Mujhe umeed hai ki firewall ke baare mein banayi gayi yeh video aapko pasand aayegi.
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Technical Guruji