'Cipher' presentation slideshows

Session 1: Introduction to cryptology

Session 1: Introduction to cryptology. Cryptology. Cryptology: criptos=secret + logos=science Cryptology = Cryptography + Cryptanalysis Opposite and complementary at the same time Cryptography: develops methods of encipherment in order to protect information.

969 views • 70 slides

Cryptography and Mary Queen of Scots

Cryptography and Mary Queen of Scots. Alice Yuyen Chang Spring 2004 at Chang Gung University A Lecture Given in Freshman English Courses. Think before you read. What will be the best methods to guarantee the security of classified documents or your love letters?

877 views • 55 slides

CRYPTOGRAPHY

CRYPTOGRAPHY. Lecture 2 Tuesday, June 27th. Caesar shift. Plain : abcdefghijklmnopqrstuvwxyz ROT 0 : ABCDEFGHIJKLMNOPQRSTUVWXYZ ROT 1 : BCDEFGHIJKLMNOPQRSTUVWXYZA ROT 2 : CDEFGHIJKLMNOPQRSTUVWXYZAB ROT 3 : DEFGHIJKLMNOPQRSTUVWXYZABC ROT 4 : EFGHIJKLMNOPQRSTUVWXYZABCD

783 views • 43 slides

Sympatric Encryption

539 views • 43 slides

CRYPTOGRAPHIC DATA INTEGRITY ALGORITHMS

CRYPTOGRAPHIC DATA INTEGRITY ALGORITHMS. Contents. CRYPTOGRAPHIC HASH FUNCTIONS MESSAGE AUTHENTICATION CODES DIGITAL SIGNATURES. 1. CRYPTOGRAPHIC HASH FUNCTIONS. Applications of Cryptographic Hash Functions Two Simple Hash Functions Requirements and Security

945 views • 40 slides

Cryptography

Cryptography. Chapter 2 of Tjaden, Brett, Fundamentals of Secure Computer Systems. Franklin, Beedle & Associates, 2004. Overview. What is cryptography? Classic cryptosystems The Caesar cipher Monoalphabetic replacement cipher The one-time pad Types of cryptosystems Codes vs. ciphers

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Cryptography and Network Security Chapter 12

831 views • 33 slides

Beyond-birthday-bound Security Based on Tweakable Block Ciphers

Beyond-birthday-bound Security Based on Tweakable Block Ciphers. Kazuhiko Minematsu NEC Corporation. Fast Software Encryption 2009, Leuven, Belgium. Doubling the Block Length of a Cipher. Build 2n-bit block cipher using n-bit components Many solutions, e.g., using Feistel Permutation.

432 views • 28 slides

An Introduction to Cryptography

516 views • 27 slides

Crypto Laboratory Winter 2007-2008

Crypto Laboratory Winter 2007-2008. Alexander Grechin and Zohar Rogel Under supervision of Zvika Berkovich. Development technology. C# language (VS 2005) and Microsoft .NET framework 2.0 Reflection technology Built-in graphics features Simple GUI generation. Purchased knowledge.

331 views • 22 slides

Randomness

Randomness. Is this a problem?. Importance of randomness Keys Challenges Random algorithms Objective: uniform choice in large domain Implementation attempts Time Time as seed & PRG Traffic Memory contents. True RNG. Physical sources Disk rotation Sampling of unsynchronized clocks

295 views • 17 slides

Functionality of the RSA cipher

Functionality of the RSA cipher. CrypTool Team November 2010. Cryptography and what you need it for. Data reaches their receiver indirectly by passing between several servers. At each node, the data can be captured, read and even changed. Modern cryptography is about securing this data.

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293 views • 16 slides

A brief introduction to cryptography

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Data Front Solutions Team

Data Front Solutions Team. James McKenna Group Role: Project Manager. Angela Decker Group Role: Stakeholder Liaison. Lauren Nearhood Group Role: Creative Consultant. Linda Levan-Mowery Group Role: Technical Writer. Problem Statement. {.

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Pseudorandom Generators

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1st Class Discrete Structures ??????? ???????? ?????? ?????? : ? .? . ??? ???? ????

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Monoalphabetic Cipher

Monoalphabetic Cipher. Rather than just shifting the alphabet Could shuffle (jumble) the letters arbitrarily Each plaintext letter maps to a different random cipher text letter hence key is 26 letters long Plain: abcdefghijklmnopqrstuvwxyz Cipher: DKVQFIBJWPESCXHTMYAUOLRGZN

1.83k views • 11 slides

An Expert System for Solving Simple Cryptograms

An Expert System for Solving Simple Cryptograms. Carolyn Rucci Dr. Ralph Morelli 1 year project. Overview. Goal Background information What is an Expert System My Expert System - CipherExpert How does CipherExpert Work? Extensibility Results from testing Caesar Cipher. Cipher?.

238 views • 10 slides

Lecture 2 Classical Cipher System SIMPLE SUBSTITUTION CIPHERS

Lecture 2 Classical Cipher System SIMPLE SUBSTITUTION CIPHERS. By: NOOR DHIA AL- SHAKARCHY 2012-2013. 2- SIMPLE SUBSTITUTION CIPHERS :.

381 views • 10 slides