'Substitution ciphers' diaporamas de présentation

Modern Cryptography ?????

Modern Cryptography ?????. 2017. 3. ? ? ? ?? ????? ??????. Outline. 1. Information Security 2. History of Cryptography 3. Modern Cryptography 3.1 Overview 3.2 Block cipher 3.3 Public key encryption 3.4 Digital signature 3.5 Hash and MAC 4. Certification and PKI.

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Section 3.6: An Introduction to Cryptography

Math for Liberal Studies. Section 3.6: An Introduction to Cryptography. Adding Security to Messages. How do we protect the security of the messages we send? This is a very important issue in the information age Consider the number of times you send information you hope is secure:

1.12k views • 59 slides

Classic Crypto

Classic Crypto. Overview. We briefly consider the following classic (pen and paper) ciphers Transposition ciphers Substitution ciphers One-time pad Codebook These were all chosen for a reason We see same principles in modern ciphers. Transposition Ciphers.

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Introduction to Information Security Lecture 2: Quick Overview on Information Security

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ITIS 3200: Introduction to Information Security and Privacy

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ITIS 3200: Introduction to Information Security and Privacy

620 views • 43 slides

Cryptography and Network Security Chapter 2

531 views • 42 slides

Cryptography

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CS363

Week 1 - Friday. CS363. Last time. What did we talk about last time? Computer criminals Methods of defense Cryptography basics. Questions?. Project 1. Security tidbit of the day.

573 views • 36 slides

CS363

Week 1 - Friday. CS363. Last time. What did we talk about last time? Computer criminals Methods of defense Cryptography basics. Questions?. Project 1. Security tidbit of the day.

461 views • 36 slides

CS 5950/6030 Network Security Class 6 (W, 9/ 14 /05)

CS 5950/6030 Network Security Class 6 (W, 9/ 14 /05). Leszek Lilien Department of Computer Science Western Michigan University [Using some slides prepared by: Prof. Aaron Striegel, U. of Notre Dame Prof. Barbara Endicott-Popovsky , U. Washington, Prof. Deborah Frincke , U. Idaho

435 views • 34 slides

CS 5950/6030 Network Security Class 6 (W, 9/ 14 /05)

CS 5950/6030 Network Security Class 6 (W, 9/ 14 /05). Leszek Lilien Department of Computer Science Western Michigan University [Using some slides prepared by: Prof. Aaron Striegel, U. of Notre Dame Prof. Barbara Endicott-Popovsky , U. Washington, Prof. Deborah Frincke , U. Idaho

481 views • 34 slides

Cryptography CS 555

Cryptography CS 555. Topic 2: Evolution of Classical Cryptography. Lecture Outline. Basics of probability Vigenere cipher. Attacks on Vigenere: Kasisky Test and Index of Coincidence Cipher machines: The Enigma machine. Required readings: Katz & Lindell: 1.1 to 1.3 Recommended readings

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Classical Encryption Techniques Week 6 - Sun

Classical Encryption Techniques Week 6 - Sun. Three Techniques in Encryption. Shift Cipher each letter is translated to a letter a fixed number of places after it in the alphabet. ( Caesar Cipher ) Substitution

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Information Security CS 526 Topic 2

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Information Security CS 526 Topic 2

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Elementary Cryptology

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CSE331: Introduction to Networks and Security

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Symmetric Encryption

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Substitution Ciphers

Substitution Ciphers. Substitute a letter with another letter Caesar Cipher Mono alphabetic Very easy to break Vigenere Cipher Poly alphabetic Took 300 years to break Kasiski Attack Now we know it is easily breakable. Vigenere Cipher Table A B C D E F G H I J K L M N O P

682 views • 2 slides