'Simple substitution cipher' diaporamas de présentation

E-Commerce Architectures and Technologies

E-Commerce Architectures and Technologies. Rob Oshana Southern Methodist University. Cryptography. Security Service Layers. Non-repudiation. Data Integrity. Data Confidentiality. Access Control. Authentication. Authentication. Typically the first step to gain access to a system

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Cryptography and Network Security Chapter 2

1.27k views • 66 slides

Ciphers

Ciphers. Dan Fleck CS 469: Security Engineering. 1. 1. 1. These slides are modified with permission from Bill Young ( Univ of Texas). What is Good Encryption ?. The following are suggested as tests of worth for current cryptographic practice: is based on sound mathematics;

485 views • 46 slides

Cryptography in Ancient Civilizations

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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

CRYTOGRAPHY

CRYTOGRAPHY. PIGPEN CIPHER. Contents. Introduction History Advantages Disadvantages Explanation (how it works) Illustrated examples TEST! Cracking the code (how to break it). Introduction. Simple substitution cipher for symbols based on a grid.

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Classical Techniques: Substitution

Classical Techniques: Substitution. Substitute a character, digit or symbol for each character in the plaintext Discussed: The Caesar cipher Monoalphabetic cipher Playfair cipher Polyalphabetic cipher. Caesar Cipher. 2000 years ago, by Julius Caesar

318 views • 15 slides

Introduction to Cryptography

Introduction to Cryptography. Lecture 6. Substitution Cipher.

270 views • 11 slides