'Shift ciphers' diaporamas de présentation

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:

1.13k views • 59 slides

Polyalphabetic CIPHERS

Polyalphabetic CIPHERS. Linguistics 484. Summary. The idea How to recognize: index of coincidence How many alphabets: Kasiski. The idea. Remove the invariant that a plaintext letter always maps to the same cryptotext letter. Smooth out the frequency distribution, removing clues.

471 views • 33 slides

Classical Cryptosystems

Classical Cryptosystems. Shift Ciphers (Caesar) y= x+k (mod 26) Affine Ciphers y=ax+b (mod 26) Vigenere Ciphers codes=(02,14,03,04,18) Substitution Ciphers (26! Permutations) Sherlock Holmes P27 (Visual Substitution) The Playfair and ADFG[V]X Ciphers Block Ciphers

831 views • 32 slides

Cryptology with Spreadsheets

Cryptology with Spreadsheets. A Computer Course for Everyone. Jim Belk Texas A&M University. The Course. MATH 135: The Art of Secret Writing Cornell University, Spring 2005 Humanities students fulfilling a math/computer science requirement. No prerequisites

537 views • 17 slides

Discrete Mathematics: Cryptography

Discrete Mathematics: Cryptography. Section Summary. Classical Cryptography Caesar Cipher Shift Cipher Affine Ciphers Block Ciphers Cryptosystems Public Key Cryptography RSA Cryptosystem. Caesar Cipher.

3.17k views • 14 slides

146 views • 14 slides