* Reading*: §9.2–9.3

- Greetings and felicitations!
- Quick discussion of midterm

- Product ciphers: DES
- Public-Key Cryptography
- 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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