'Encipher' presentation slideshows

Cryptography is the science of using mathematics to encrypt and decrypt data.

Cryptography is the science of using mathematics to encrypt and decrypt data. Cryptography enables you to store sensitive information or transmit it across insecure networks (like the Internet) so that it cannot be read by anyone except the intended recipient. What is Cryptography?.

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Security Basics (Cryptography)

Security Basics (Cryptography). SSE USTC Qing Ding. Agenda. What is and Why network security? What security services do we need? Cryptographic process Public key vs. Secret key scheme Digital signing, Tamper-proofing & Encrypting Security (Cryptographic) technologies

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More on Elementary Cryptology

More on Elementary Cryptology. The Multiliteral Cipher.

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Public Key Encryption

CS461/ECE422 Spring 2012. Public Key Encryption. Reading Material. Text Chapters 2 and 21 Handbook of Applied Cryptography, Chapter 8 http://www.cacr.math.uwaterloo.ca/hac/. Symmetric keys & Distribution. Every pair of people must share a secret key E.g.: Alice, Bob, Carol, David:

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Chap 1: Introduction

Chap 1: Introduction. Some background The message is usually represented as M or P (plaintext), the encryption result is usually represented as C (ciphertext). C usually has the same length as M or even longer E(M) = C, D(C) = M D(E(M)) = M

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Section 2.3: Substitution Ciphers

Section 2.3: Substitution Ciphers. Practice HW from Barr Textbook (not to hand in) p. 92 # 1, 2 # 3-5 ( Use Internet Site ). A substitution cipher is a cipher in which correspondents agree on a rearrangement

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Classic Cryptography

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Bishop: Chapter 10 (Cont.) Key Management: Storage & Revoking

Bishop: Chapter 10 (Cont.) Key Management: Storage & Revoking. Topics. Key exchange Session vs interchange keys Classical vs public key methods Key generation Cryptographic key infrastructure Certificates Key storage Key escrow Key revocation Digital signatures. Storing Keys.

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HW 3: Problems 2&3

HW 3: Problems 2&3. HW 3 Prob 2:Encipher. encipher( S , n ) takes as input a string S and a non-negative integer n between 0 and 25. This function returns a new string in which the letters in S have been rotated by n characters. For this problem, you should assume that....

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