Outline for November 13, 2006
Greetings and felicitations!
Quick discussion of midterm
Product ciphers: DES
Basic idea: 2 keys, one private, one public
Cryptosystem must satisfy:
Given public key, computationally infeasible to get private key;
Cipher withstands chosen plaintext attack;
Encryption, decryption computationally feasible [note: commutativity not required]
Benefits: can give confidentiality or authentication or both
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Version of November 14, 2006 at 9:24 PM