Search results “Feistel structure in cryptography history”
Lecture 5: Data Encryption Standard (DES): Encryption by Christof Paar
For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
Lecture 6: Data Encryption Standard (DES): Key Schedule and Decryption by Christof Paar
For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
Block Cipher Standards (DES)
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: 29107 nptelhrd
Chapter 3, part 1: Symmetric Key Crypto --- stream ciphers, A5/1, shift registers
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: 25117 Mark Stamp
What is symmetric encryption?
Cryptography has a fascinating history going back thousands of years. However, until relatively recently all cryptographic algorithms fell into one category referred to as symmetric encryption. In symmetric encryption both the sender and receive share a single key that is used both to encrypt and decrypt messages. Encryption takes a plaintext message and produces a ciphertext. Decryption takes the ciphertext message and produces the originalplaintext. A variety of simple symmetric encryption algorithms exist. Symmetric encryption is still in wide use today, although computers have allowed the algorithms that are used to become significantly more complex and secure. Credits: Talking: Geoffrey Challen (Assistant Professor, Computer Science and Engineering, University at Buffalo). Producing: Greg Bunyea (Undergraduate, Computer Science and Engineering, University at Buffalo). Part of the https://www.internet-class.org online internet course. A blue Systems Research Group (https://blue.cse.buffalo.edu) production.
Views: 474 internet-class
Blowfish (cipher)
Blowfish is a symmetric-key block cipher, designed in 1993 by Bruce Schneier and included in a large number of cipher suites and encryption products. Blowfish provides a good encryption rate in software and no effective cryptanalysis of it has been found to date. However, the Advanced Encryption Standard (AES) now receives more attention. Schneier designed Blowfish as a general-purpose algorithm, intended as an alternative to the aging DES and free of the problems and constraints associated with other algorithms. At the time Blowfish was released, many other designs were proprietary, encumbered by patents or were commercial or government secrets. Schneier has stated that, "Blowfish is unpatented, and will remain so in all countries. The algorithm is hereby placed in the public domain, and can be freely used by anyone." This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 28633 Audiopedia
In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure. An alternative, less common term is encipherment. To encipher or encode is to convert information from plain text into cipher or code. In non-technical usage, a 'cipher' is the same thing as a 'code'; however, the concepts are distinct in cryptography. In classical cryptography, ciphers were distinguished from codes. Codes generally substitute different length strings of characters in the output, while ciphers generally substitute the same number of characters as are input. There are exceptions and some cipher systems may use slightly more, or fewer, characters when output versus the number that were input. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 111 Audiopedia
Confusion and diffusion
Confusion and diffusion In cryptography, confusion and diffusion are two properties of the operation of a secure cipher identified by Claude Shannon in his 1945 classified report A Mathematical Theory of Cryptography.Confusion means that each binary digit (bit) of the ciphertext should depend on several parts of the key. -Video is targeted to blind users Attribution: Article text available under CC-BY-SA image source in video https://www.youtube.com/watch?v=0nODywkerzw
Views: 9177 WikiAudio
29C3: Security Evaluation of Russian GOST Cipher (EN)
Speaker: Dr Nicolas T. Courtois Survey of All Known Attacks on Russian Government Encryption Standard In this talk we will survey some 30 recent attacks on the Russian GOST block cipher. Background: GOST cipher is the official encryption standard of the Russian federation, and also has special versions for the most important Russian banks. Until 2012 there was no attack on GOST when it is used in encryption with random keys. I have developed more than 30 different academic attacks on GOST the fastest has complexity of 2^118 to recover some but not all 256-bit keys generated at random, which will be presented for the first time at CCC conference. It happens only once per decade that a government standard is broken while it is still an official government standard (happened for DES and AES, no other cases known). All these are broken only in academic sense, for GOST most recent attacks are sliding into maybe arguably practical in 30 years from now instead of 200 years... Our earlier results were instrumental at ISO for rejecting GOST as an international encryption standard last year. Not more than 5+ block cihers have ever achieved this level of ISO standardisation in 25 years and it NEVER happended in history of ISO that a cipher got broken during the standardization process. For more information visit: http://bit.ly/29C3_information To download the video visit: http://bit.ly/29C3_videos Playlist 28C3: http://bit.ly/29C3_playlist
Views: 353 Christiaan008
What does stream cipher mean?
What does stream cipher mean? A spoken definition of stream cipher. Intro Sound: Typewriter - Tamskp Licensed under CC:BA 3.0 Outro Music: Groove Groove - Kevin MacLeod (incompetech.com) Licensed under CC:BA 3.0 Intro/Outro Photo: The best days are not planned - Marcus Hansson Licensed under CC-BY-2.0 Book Image: Open Book template PSD - DougitDesign Licensed under CC:BA 3.0 Text derived from: http://en.wiktionary.org/wiki/stream_cipher Text to Speech powered by TTS-API.COM
Fundamentals of Cryptography
In this video, I explain the fundamentals concept of cryptography like types of crypt analysis, symmetric & asymmetric key algorithms, encryption & decryption process, overview of cryptography fundamentals, basic terminology used in cryptography, brute force attack, social engineering attack, implementation attack etc.. -~-~~-~~~-~~-~- Dear Friends please watch my video lecture and hit like, subscribes and don't forget to share with your friends. -~-~~-~~~-~~-~-
Views: 411 Kavita Jakhar
Network Security - Block Cipher Mode of Operation
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 2 - Symmetric Key Cryptography In this module we present the basic mechanism of symmetric key crytography algorithms, discuss the DES and AES standard, describe the criteria for selecting AES standard, present the block cipher operating modes and discuss how the block swapping attacks and replay attacks can be prevented and detected. Learning Objectives • Understand the criteria for selecting crypto algorithms • Perform cryptoanalysis on simple ciphers • Select operating modes for symmetric encryption and to prevent block swapping and replay attacks • Understand DES and AES standards and their buildig blocks Subscribe at: https://www.coursera.org
Views: 98 intrigano
Properties of Modular Arithmetic
Properties of Modular Arithmetic are introduced.
Views: 52 Ranthony Clark
Information Security Lessons in Kurdish - Lecture No.5
Information Security Lessons in Kurdish - Lecture No.5 Feistel Cipher Structure.. Part of E-Learning project in Kurdish language produced by a group of students. Dohuk Polytechnic University Zakho Technical Institute.
Views: 261 Abdulraheem Jamil
Views: 2463 Internetwork Security
2011 Killian Lecture: Ronald L. Rivest, "The Growth of Cryptography"
Lecture title: "The Growth of Cryptography" Ronald L. Rivest, a professor of electrical engineering and computer science who helped develop one of the world's most widely used Internet security systems, was MIT’s James R. Killian, Jr. Faculty Achievement Award winner for 2010–2011. Rivest, the Andrew and Erna Viterbi professor in MIT's Department of Electrical Engineering and Computer Science, is known for his pioneering work in the field of cryptography, computer, and network security. February 8, 2011 Huntington Hall (10-250)
Threat Model - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 1315 Udacity
Data Encryption Standard
The Data Encryption Standard (DES, /ˌdiːˌiːˈɛs/ or /ˈdɛz/) is a previously predominant symmetric-key algorithm for the encryption of electronic data. It was highly influential in the advancement of modern cryptography in the academic world. Developed in the early 1970s at IBM and based on an earlier design by Horst Feistel, the algorithm was submitted to the National Bureau of Standards (NBS) following the agency's invitation to propose a candidate for the protection of sensitive, unclassified electronic government data. In 1976, after consultation with the National Security Agency (NSA), the NBS eventually selected a slightly modified version, which was published as an official Federal Information Processing Standard (FIPS) for the United States in 1977. The publication of an NSA-approved encryption standard simultaneously resulted in its quick international adoption and widespread academic scrutiny. Controversies arose out of classified design elements, a relatively short key length of the symmetric-key block cipher design, and the involvement of the NSA, nourishing suspicions about a backdoor. The intense academic scrutiny the algorithm received over time led to the modern understanding of block ciphers and their cryptanalysis. DES is now considered to be insecure for many applications. This is chiefly due to the 56-bit key size being too small; in January, 1999, distributed.net and the Electronic Frontier Foundation collaborated to publicly break a DES key in 22 hours and 15 minutes (see chronology). There are also some analytical results which demonstrate theoretical weaknesses in the cipher, although they are infeasible to mount in practice. The algorithm is believed to be practically secure in the form of Triple DES, although there are theoretical attacks. In recent years, the cipher has been superseded by the Advanced Encryption Standard (AES). Furthermore, DES has been withdrawn as a standard by the National Institute of Standards and Technology (formerly the National Bureau of Standards). This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 1103 Audiopedia
Write: go rot13.com and text your message first and copy Translate: paste your rot13 type text and it will be translate automatically Music: Ich Grolle Nicht
Views: 2772 By Cips
Binary number
In mathematics and digital electronics, a binary number is a number expressed in the binary numeral system, or base-2 numeral system, which represents numeric values using two different symbols: typically 0 and 1 . More specifically, the usual base-2 system is a positional notation with a radix of 2. Because of its straightforward implementation in digital electronic circuitry using logic gates, the binary system is used internally by almost all modern computers and computer-based devices such as mobile phones. This video targeted to blind users. Attribution: Article text available under CC-BY-SA Public domain image source in video
Views: 22 encyclopediacc
Ciphertext Meaning
Video shows what ciphertext means. Encoded text, text that is unreadable.. Ciphertext Meaning. How to pronounce, definition audio dictionary. How to say ciphertext. Powered by MaryTTS, Wiktionary
Views: 757 SDictionary
What Is A Chosen Ciphertext Attack?
A chosen ciphertext attack (cca) is an model for cryptanalysis where the cryptanalyst can gather information by obtaining decryptions of ciphertexts a in which gathers information, at least part, choosing and its decryption under unknown key someone please explain using simple example how attack, attacker assumed to have way trick scenario has ability choose c i view their corresponding plaintexts p adaptive make his or her choice inputs performing description, examples, similar methods 1 attacksin preceding lectures, our notion security encryption was constrained work against so called passive dec 2014 one may piece attempt obtain decrypted video created stanford university course 'cryptography i'this week's topic authenticated ''22 jan 201629 mar 2015 plaintext we gave adversary access oracle 31 mr. Chosen ciphertext attack simple english wikipedia, the free chosen wikipedia. Essentially a cryptosystem that is rcca secure has full cca2 security except for. Let a be an algorithm in cca attack against the scheme. Chosen ciphertext attack wikipedia en. Again, 9 jan 2017 in an adaptive chosen ciphertext attack scenario, the attacker's goal is to decrypt a c without any knowledge of (symmetric or replayable (rcca) secure encryp tion. Somorovsky 2011 xml cca securebad newsfoundations of cryptographywellesley college implementation chosen ciphertext attacks against pgp and gnupg. Patrick chosen pt, ct, known ciphertext only attack are follows the same mechanism to predict. Luiz firmino, cissp, cism chosen ciphertext attacks stanford university attack youtube. Adaptive chosen ciphertext attack springercrypto it. What is the exact difference between chosen plaintext and ciphertext attacks. Discuss some historical real world examples vaudenay 2002 padding oracle attacks, jager. Wikipedia wiki chosen ciphertext_attack url? Q webcache. Adaptive chosen ciphertext attacks ws. Chosen ciphertext attacks computer science wellesley college. Rsa, aes, des, 3des are chosen ciphertext attacks to do. Chosen ciphertext security princeton cs. Kahil jallad1,4, jonathan katz2,4, jena j1 the eon 21 nov 2005 chosen ciphertext security (cca) (this is a straightforward conver proof. Rerandomizable and replayable adaptive chosen ciphertext. 7 3 chosen ciphertext attacks 12 min youtube. Chosen ciphertext attacks georgia tech college of computing attack (cca). Chosen ciphertext attack simple english wikipedia, the free. Chosen ciphertext attack simple english wikipedia, the free cryptanalysis how does a chosen work, with springer. Googleusercontent search. Implementation of chosen ciphertext attacks against pgp and gnupg. Lecture 4 1 introduction 2 chosen ciphertext attack security.
Views: 173 Til Til
introduction to database --learn database in urdu hindi
Learn more with http://vdotutorials.com/ mohammad fayyaz in this video introduction to database you can learn about database, more this video is baout introduction to database concepts. you can also learn about introduction to database design, this video also tells you about dbms introduction to database management system, Know you can learn every thing in urdu and hindi and in language of common man this video introduction to database will teach you main concept about database in urdu and hindi, keep watching urdu video lectures thankyou