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- 500 BC, Hebrew scholars
- substitution ciphers
- 1863, Kasiski
- polyalphabetic cipher cryptanalysis
- 1883, Kerchoff
- Requirements for viability of encryption systems.
- 1917, Gilbert Vernam
- (AT&T) one-time pad.
- 1917, William Friedman, Herbert Yardley
- fathers of US
cryptanalysis.
- 1919, Koch and Damm
- invention of rotor machine.
Up until the 1970s, cryptography is primarily studied by
governments and criminals.
Kevin McCurley
1/23/1998