'Mod 26' presentation slideshows

??? ????????

??? ????????. ????. ????????????? ????????????????? DES ??? Data Encryption Standard ? RSA ??? Rivest-Shamir-Adleman ? ????????????????? ??????????? PGP ? Pretty Good Privacy ???? PGP ?????????????. ????. ???? crytology ? ????????????? ?????? crytography ? ????????????????????

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??? (Cryptology)

??? (Cryptology). ??. ???. ??. Bob. Alice. ???. 1st. 16th. ???? ?? ??. 0699 0043 1313 9642. Select odd numbers. 0 6 9 9 0 0 4 3 1 3 1 3 9 6 4 2. Select even numbers After * 2, if ? 9 then -9. 0 6 9 9 0 0 8 3 2 3 2 3 9 6 8 2. *10. 0+6+9+9+0+0+8+3+2+3+2+3+9+6+8+2 = 70.

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Lecture 02 Symmetric Cryptography 1

Lecture 02 Symmetric Cryptography 1. Dr. Supakorn Kungpisdan supakorn@mut.ac.th. Roadmap. Overview of Cryptography Types of Cryptography Symmetric Cryptography Classical Cryptographic Techniques Block Ciphers Modern Cryptographic Techniques. Basic Terminology.

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ENGG2013 Unit 11 Row-Rank

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CHAPTER 4: Classical (secret-key) cryptosystems

CHAPTER 4: Classical (secret-key) cryptosystems. In t his chapter we deal with some of the very old or quite old cryptosystems that were primarily used in the pre-computer era. IV054. These cryptosystems are too weak nowadays, too easy to break, especially with computers.

716 views • 47 slides

CHAPTER 4: Classical (secret-key) cryptosystems

CHAPTER 4: Classical (secret-key) cryptosystems. In t his chapter we deal with some of the very old or quite old cryptosystems that were primarily used in the pre-computer era. IV054. These cryptosystems are too weak nowadays, too easy to break, especially with computers.

691 views • 47 slides

Cryptography( ??? )

Cryptography( ??? ). ??? ???? ???? ????. ???. ??????????????????????. ???????. ????. ???????????????????? ??????????? ASCII ????????????? 8 ????????? ? B,A,T,C ??? 01000010, 01100010, 00110111 , ? 01000011 ??? ???? B ???????????????????????? 0100001 1 ? ??????? C ? ????????????.

717 views • 46 slides

Cryptography

Cryptography. The Science, Mathematics, and Art of Secrecy. Who is the largest of employer of mathematicians in the world (and a significant employer of computer scientists). Click for the Answer. Terms. Information Assurance Securing systems from unauthorized entry

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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

512 views • 38 slides

Cryptography

Cryptography. The Science, Mathematics, and Art of Secrecy. Who is the largest of employer of mathematicians in the world (and a significant employer of computer scientists). Click for the Answer. Terms. Information Assurance Securing systems from unauthorized entry

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ENGG2013 Unit 10 n ? n determinant and an application to cryptography

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Modular Arithmetic

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Cryptanalysis

Cryptanalysis. The general goal of cryptanalysis is to find the key being used in an encryption, or at the very least, the decryption function Recall that there are four possible starting points for a cryptanalysis Ciphertext only : we only have the ciphertext string y of a message

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Elements of Coding and Encryption

Elements of Coding and Encryption. Continuation. Greatest Common Divisor. Given integers m and n , not both zero, we define the greatest common divisor of m and n to be the largest integer that divides both m and n : GCD ( m , n ).

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Introduction to Codes, Ciphers, and Cryptography

Introduction to Codes, Ciphers, and Cryptography. Michael A. Karls Ball State University. Introduction. Throughout history, people have had the need to send messages to other people in secret ! Methods have been developed to disguise and break secret messages. Definitions and Terminology.

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Some Number Theory

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CPSC 3730 Cryptography

CPSC 3730 Cryptography. Chapter 2 Classical Encryption Techniques. Fig 2.1 Model of Conventional Encryption. Brute Force Attack/ Key Search. Table 2.2 Average Time Required for Exhaustive Key Search. Caesar Cipher (substitution technique).

221 views • 9 slides