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

Views: 17933
Udacity

#rsa #deffiehellman #cryptographylectures #lastmomenttuitions
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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: 280477
Last moment tuitions

Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Sections 3.1-3.2.1
stream ciphers, A5/1, shift registers
Class Lecture, 2011

Views: 27953
Mark Stamp

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

Views: 1082
Udacity

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: 480835
itfreetraining

An introduction to linear feedback shift registers, and their use in generating pseudorandom numbers for Vernam ciphers.
For more cryptography, subscribe to my channel: https://www.youtube.com/channel/UC1KV5WfubHTV6E7sVCnTidw

Views: 29667
Jeff Suzuki

XOR ciphers take advantage of Ascii encoding and basic bit switching operations. They are extremely fast, but not particularly secure when used alone, without a key exchange algorithm. XOR ciphers make up much of the basis of how modern encryption works.
More Crypto 101:
ADFVGX - https://www.youtube.com/watch?v=Y5-ory-Z25g
Pigpen - https://www.youtube.com/watch?v=bUlIvx0fgV8
Homophonic Cipher - https://www.youtube.com/watch?v=sB_3fcO8G24
Vigenère Cipher - https://www.youtube.com/watch?v=QzizXgWGjcM
Cracking Substitution Ciphers - https://www.youtube.com/watch?v=p99Wo_rr7OA
Caesar shift and Atbash - https://www.youtube.com/watch?v=BbcYLI_3mNA
Support me on Patreon if you are into that - https://www.patreon.com/laingsoft

Views: 9537
Charles Laing

On August 29, 2012, Prof. Pante Stanica from the Naval Postgraduate School, spoke on graph-theoretic tools for cryptographic Boolean functions. In this 50 minute talk, Prof Stanica discusses various properties of Boolean functions through the prism of graph theory. Cayley graphs and Nagy graphs are intorduced in this context, and new directions for further research are mentioned at the end of the talk. More details of parts of the talk can be found in his book with Thomas W. Cusick: "Cryptographic Boolean Functions and Applications," Academic Press - Elsevier, March 2009.

Views: 225
David Joyner

This is the fourth in a series about cryptography; an extremely important aspect of computer science and cyber security. It covers the XOR logical operation, that is the exclusive OR operation, explaining how it can be used to encrypt and decrypt a sequence of binary digits. XOR is an important process that is employed by many modern day ciphers. Using a spreadsheet, this video demonstrates how the XOR logical operation can be applied to a single character ASCII code to encrypt and decrypt it using the same symmetric key, and the same method.

Views: 309
Computer Science

Analysis and Beyond - Celebrating Jean Bourgain's Work and Impact
May 23, 2016
More videos on http://video.ias.edu

Views: 510
Institute for Advanced Study

Part 3: Introduction to codes and an example or RSA public key encryption.

Views: 1884
MAT 243 Discrete Mathematics

Paper by Seny Kamara and Tarik Moataz presented at Eurocrypt 2017. See https://www.iacr.org/cryptodb/data/paper.php?pubkey=28003

Views: 235
TheIACR

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

Views: 7884
Udacity

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: 211
Microsoft Research

simple program that uses xor encryption algorithm to encrypt a string.
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Views: 15693
Zer0Mem0ry

The study of monotonicity and negation complexity for Boolean functions has been prevalent in complexity theory as well as in computational learning theory, but little attention has been given to it in the cryptographic context. Recently, Goldreich and Izsak (2012) have initiated a study of whether cryptographic primitives can be monotone, and showed that one-way functions can be monotone (assuming they exist), but a pseudorandom generator cannot. In this work, we start by filling in the picture and proving that many other basic cryptographic primitives cannot be monotone. We then initiate a quantitative study of the power of negations, asking how many negations are required. We provide several lower bounds, some of them tight, for various cryptographic primitives and building blocks including one-way permutations, pseudorandom functions, small-bias generators, hard-core predicates, error-correcting codes, and randomness extractors. Among our results, we highlight the following. i) Unlike one-way functions, one-way permutations cannot be monotone. ii) We prove that pseudorandom functions require log n−O(1) negations (which is optimal up to the additive term). iii) Error-correcting codes with optimal distance parameters require log n−O(1) negations (again, optimal up to the additive term). iv) We prove a general result for monotone functions, showing a lower bound on the depth of any circuit with t negations on the bottom that computes a monotone function f in terms of the monotone circuit depth of f. This result addresses a question posed by Koroth and Sarma (2014) in the context of the circuit complexity of the Clique problem. Joint work with Siyao Guo, Igor Carboni Oliveira, and Alon Rosen.

Views: 239
Microsoft Research

Image Encryption and Decryption using Chaotic Key Sequence Generated by Sequence of Logistic Map and Sequence of States of Linear Feedback Shift Register
This video project is done by:
Potcharaphol Chat-anan (Aung)
Tan Wei Jie, Chester
Feng Wei
Nicholas Koh Ming Xuan
Jonathan Liem Zhuan Kim
Chia Su Chi Faith

Views: 12444
Potcharaphol Chat-anan

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com

Views: 82865
Introduction to Cryptography by Christof Paar

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.
Learn more at http://code.org/
Help us translate into your language: http://code.org/translate/videos
Stay in touch with us!
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Help us caption & translate this video!
https://amara.org/v/HGaS/

Views: 225143
Code.org

Spies used to meet in the park to exchange code words, now things have moved on - Robert Miles explains the principle of Public/Private Key Cryptography
note1: Yes, it should have been 'Obi Wan' not 'Obi One' :)
note2: The string of 'garbage' text in the two examples should have been different to illustrate more clearly that there are two different systems in use.
http://www.facebook.com/computerphile
https://twitter.com/computer_phile
This video was filmed and edited by Sean Riley.
Computer Science at the University of Nottingham: http://bit.ly/nottscomputer
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: 428733
Computerphile

Views: 4698
Introduction to Cryptology

2018 Program for Women and Mathematics
Topic: Mathematical Ideas in Lattice Based Cryptography
Speaker: Jill Pipher
Affiliation: Brown University
Date: May 21, 2018
For more videos, please visit http://video.ias.edu

Views: 622
Institute for Advanced Study

Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in

Views: 28218
nptelhrd

Лекция: Analysis of Boolean Functions. Part I | Курс: Analysis of Boolean Functions | Лектор: Ryan O'Donnell | Организатор: Математическая лаборатория имени П.Л.Чебышева
Смотрите это видео на Лекториуме: https://www.lektorium.tv/lecture/28290
Подписывайтесь на канал: https://www.lektorium.tv/ZJA
Следите за новостями:
https://vk.com/openlektorium
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Views: 1785
Лекториум

Caesar Code method in Data Encryption is discussed here with details of example calculation.
Script and audio: Dr. Rajib L. Das
Website: www.rldworld.com

Views: 182
RLD World

Candidates should be able to:
• Show understanding of the use of encryption.

Views: 4745
Liam McQuay

What is AVALANCHE EFFECT? What does AVALANCHE EFFECT mean? AVALANCHE EFFECT meaning - AVALANCHE EFFECT definition - AVALANCHE EFFECT explanation.
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Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.
In cryptography, the avalanche effect is the desirable property of cryptographic algorithms, typically block ciphers and cryptographic hash functions, wherein if an input is changed slightly (for example, flipping a single bit), the output changes significantly (e.g., half the output bits flip). In the case of high-quality block ciphers, such a small change in either the key or the plaintext should cause a drastic change in the ciphertext. The actual term was first used by Horst Feistel, although the concept dates back to at least Shannon's diffusion.
If a block cipher or cryptographic hash function does not exhibit the avalanche effect to a significant degree, then it has poor randomization, and thus a cryptanalyst can make predictions about the input, being given only the output. This may be sufficient to partially or completely break the algorithm. Thus, the avalanche effect is a desirable condition from the point of view of the designer of the cryptographic algorithm or device.
Constructing a cipher or hash to exhibit a substantial avalanche effect is one of the primary design objectives, and mathematically the construction takes advantage of butterfly effect. This is why most block ciphers are product ciphers. It is also why hash functions have large data blocks. Both of these features allow small changes to propagate rapidly through iterations of the algorithm, such that every bit of the output should depend on every bit of the input before the algorithm terminates.
The strict avalanche criterion (SAC) is a formalization of the avalanche effect. It is satisfied if, whenever a single input bit is complemented, each of the output bits changes with a 50% probability. The SAC builds on the concepts of completeness and avalanche and was introduced by Webster and Tavares in 1985.
Higher-order generalizations of SAC involve multiple input bits. Boolean functions which satisfy the highest order SAC are always bent functions, also called maximally nonlinear functions, also called "perfect nonlinear" functions.

Views: 946
The Audiopedia

Proofs in Cryptography
Lecture 7 Reduction Proof Example - PRF Family
ALPTEKİN KÜPÇÜ
Assistant Professor of Computer Science and Engineering
Koç University
http://crypto.ku.edu.tr

Views: 2472
KOLT KU

Security+ Training Course Index: http://professormesser.link/sy0501
Professor Messer’s Course Notes: http://professormesser.link/501cn
Frequently Asked Questions: http://professormesser.link/faq
- - - - -
Creating a public key infrastructure requires extensive planning. In this video, you’ll learn about the most important components required to build a successful PKI.
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Subscribe to get the latest videos: http://professormesser.link/yt
Calendar of live events: http://www.professormesser.com/calendar/
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Professor Messer official website: http://www.professormesser.com/
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Google +: http://www.professormesser.com/googleplus

Views: 21260
Professor Messer

Talk at crypto 2013. Authors: David Cash, Stanislaw Jarecki, Charanjit S. Jutla, Hugo Krawczyk, Marcel-Catalin Rosu, Michael Steiner

Views: 1188
TheIACR

Avishay Tal (Stanford University)
https://simons.berkeley.edu/talks/tbd-11
Boolean Devices

Views: 220
Simons Institute

Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in

Views: 18287
nptelhrd

Update: The simulation is now freely available on Google Play https://play.google.com/store/apps/details?id=air.rc4simulation&hl=en.
Details: A presentation explaining the RC4 algorithm through animation. Coded with Flash AS3.0. The specification and required algorithms were already provided by the employer. My work in this project is on programming the interface, functioning and the required animations.

Views: 28096
Vishwas Gagrani

- symmetric
- asymmetric
- stream ciphers
- CBC mode
Exercise: combining cryptographic primitives to solve a specific problem.

Views: 263
ralienpp

www.hiteshChoudhary.com www.newdemy.com
What are security issues in Cryptography?
Why there is a need of Cryptography is a very important question. In the earlier times when one need to transfer any sensitive information, one can write it on paper and can seal it along with manual monitoring system i.e. one person guarding or protecting the information. But after the invention of radio, things got changed. One can tune into your radio without your knowledge and can collect all information. Just collecting the information is not a bug issue but one can modify the information as well. Information security attack is a broad term, so let’s make a few scenario examples to clarify it out on a broad level.
Case 1
User A wants to transmit a file to user B. The file may contain some sensitive information like Bank passwords. User C, who is not authorized to read the file, is somehow monitor the transfer and captures a copy of the file during transmission.
Case 2
User A wants to transmit a file to user B. User A gives some bank details to open and close new accounts. User C, intercepts the file and add User C’s information to be added and gets a new unauthorized bank account. User C can also delete some valid account information by altering the information. User B updates the details according to information passed by User A, having no idea that information was tempered on its way.
Case 3
User A is just relaxing in this case. User C, who is an unauthorized person, just creates his own message and act as a User A and passes the information to User B. User B accepts the message and act according the message. It is totally up to User C that what he wants to do. User C can format all the information or add some backdoor information in the system and so on.
Case 4
User C works for the company and due to some reasons C was fires from the company. User A asks the User B, who is an administrator in the company to lock all the access of User C’s account. But User C, creates some useless traffic and delays the message to reach to user B. User c makes a final access to the account and downloads the entire information to local or permanent access. After completing the work he allows the message to get passed.
Case 5
A message is sent from user A to user B to purchase xyz share or xyz amount. Things didn’t went in right direction for User A and investment lose value. Now user A denies that he ever passed any message to user B to purchase any share.
These are some of the broadly covered situations explaining the need of cryptography. Cryptography gives us a solution to all of these problems. We just have to utilize the concept and put it in some form of codes or protocols to implement it.

Views: 2396
Hitesh Choudhary

Previous video: https://youtu.be/W39KqX0ZTbU
Next video: https://youtu.be/_XBQeAnjjwk

Views: 2825
Leandro Junes

Technical talks from the Real World Crypto conference series.

Views: 1013
Real World Crypto

Proofs in Cryptography
Lecture 3 Reduction Proofs - What are they?
ALPTEKİN KÜPÇÜ
Assistant Professor of Computer Science and Engineering
Koç University
http://crypto.ku.edu.tr

Views: 2434
KOLT KU

We present a Multi-Authority Attribute-Based Encryption (ABE) system. In our system, any party can become an authority and there is no requirement for any global coordination other than the creation of an initial set of common reference parameters. A party can simply act as an ABE authority by creating a public key and issuing private keys to different users that reflect their attributes. A user can encrypt data in terms of any boolean formula over attributes issued from any chosen set of authorities. Finally, our system does not require any central authority. In this talk, I will present our system and discuss its proof, which employs dual system encryption techniques. Our system uses bilinear groups of composite order, and we prove security under static assumptions in the random oracle model. This is joint work with Brent Waters.

Views: 1684
Microsoft Research

Please Subscribe here, thank you!!! https://goo.gl/JQ8Nys
Congruence Modulo n Symmetry Proof

Views: 5678
The Math Sorcerer

Publicly Verifiable Boolean Query Over Outsourced Encrypted Data
Get the Project Source Code Link : http://linkshrink.net/7TW6cv

Views: 379
1 Crore Projects

The 3rd Bar-Ilan Winter School on Cryptography: Bilinear Pairings in Cryptography, which was held between February 4th - 7th, 2013.
The event's program: http://crypto.biu.ac.il/winterschool2013/schedule2013.pdf
For All 2013 Winter school Lectures: http://www.youtube.com/playlist?list=PLXF_IJaFk-9C4p3b2tK7H9a9axOm3EtjA&feature=mh_lolz
Dept. of Computer Science: http://www.cs.biu.ac.il/
Bar-Ilan University: http://www1.biu.ac.il/indexE.php

Views: 6103
barilanuniversity

Luis Medina, University of Puerto Rico
Title: Experiments with Exponential Sums over the Binary Field.
Let $\mathbb{F}$ be the binary field and $F({\bf X}) = F(X_1, \cdots, X_n)$ a polynomial in $n$ variables over $\mathbb{F}$. The exponential sum associated to $F$ over $\mathbb{F}$ is defined as $$ S(F)=\sum_{x_1,\cdots,x_n \in \mathbb{F}}(-1)^{F(x_1,\cdots, x_n)}. $$ Boolean functions (functions over $\mathbb{F}$) have many applications to cryptography and coding theory. In this talk, we present the study of exponential sums of boolean symmetric functions from the Experimental Mathematics perspective. In particular, we find recurrence relations they satisfy and attempt to get their exact values from these recurrences.
Joint work with: Francis N. Castro and Ivelisse Rubio.

Views: 55
Experimental mathematics

Vinod Vaikuntanathan, Massachusetts Institute of Technology
The Mathematics of Modern Cryptography
http://simons.berkeley.edu/talks/Vaikuntanathan-Wee-2015-07-06

Views: 5508
Simons Institute

This video contains the basic of Group theory and basic operators like Implication will help you in various competitive exams like GATE , NET, PSU's etc

Views: 69402
KNOWLEDGE GATE

Dynamic Searchable Symmetric Encryption allows a client to store a dynamic collection of encrypted documents with a server, and later quickly carry out keyword searches on these encrypted documents, while revealing minimal information to the server. In this paper we present a new dynamic SSE scheme that is simpler and more efficient than existing schemes while revealing less information to the server than prior schemes, achieving fully adaptive security against honest-but-curious servers. We implemented a prototype of our scheme and demonstrated its efficiency on datasets from prior work. Apart from its concrete efficiency, our scheme is also simpler: in particular, it does not require the server to support any operation other than upload and download of data. Thus the server in our scheme can be based solely on a cloud storage service, rather than a cloud computation service as well, as in prior work. In building our dynamic SSE scheme, we introduce a new primitive called Blind Storage, which allows a client to store a set of files on a remote server in such a way that the server does not learn how many files are stored, or the lengths of the individual files; as each file is retrieved, the server learns about its existence (and can notice the same file being downloaded subsequently), but the file’s name and contents are not revealed. This is a primitive with several applications other than SSE, and is of independent interest.

Views: 581
Microsoft Research