首页 > itarticle > cryptography study notes (2): some ancient encryption algorithms Caesar cipher Vigener cipher (16’th centry, Rome) Rotor Machines

cryptography study notes (2): some ancient encryption algorithms Caesar cipher Vigener cipher (16’th centry, Rome) Rotor Machines

admin 11月 11, 2020 0

A key for a substitution cipher is a subsitution that basiclly says how to map our letters.

Caesar cipher

Actually is not really a cipher at all. And the reason is that it doesn’t have a key.
Basiclly is a substitution cipher where the substitution is fixed. Namely, it’s a shift by three.

Vigener cipher (16’th centry, Rome)

Key is a word.

Rotor Machines

The Hibber machine (single rotor).
The Enigma machine (3 - 5 rotor).