| Ciphers | |
- Substitution ciphers are easy (e.g 'a' replaced by 'b', 'b'
replaced by 'c', etc)
- Substitution ciphers are relatively easy to crack
- Vernam ciphers (one-time pad) can be totally secure, but are impractical
Slide 50 | ©Copyright 1997 | Jan Newmarch |