27 Sep
2017
27 Sep
'17
11:24 p.m.
Well if they don't know the key length, then using somewhere between 1/3 and 2/3 should make it unbreakable.
No, using the full length is necessary. Using a key length less than the full length of the message is very dangerous.
Hmm, as far as I'm aware, you can't do cryptanalysis on 2 characters. Marxos