'Enciphered message' presentation slideshows

Chapter 11: Cipher Techniques

Chapter 11: Cipher Techniques. Some Problems Types of Ciphers Networks Examples. Overview. Problems What can go wrong if you naively use ciphers Cipher types Stream or block ciphers? Networks Link vs end-to-end use Examples Privacy-Enhanced Electronic Mail (PEM)

1.23k views • 94 slides

October 2, 2003

October 2, 2003. Introduction to Computer Security Lecture 6 Cryptography. Overview of the DES. A block cipher: encrypts blocks of 64 bits using a 64 bit key outputs 64 bits of ciphertext A product cipher performs both substitution and transposition (permutation) on the bits

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Public Key Cryptography and Cryptographic Hashes

586 views • 46 slides

Public Key Cryptography and Cryptographic Hashes

657 views • 46 slides

The RSA Cryptosystem

407 views • 19 slides