28 Mar
2016
28 Mar
'16
2:27 a.m.
On 03/27/2016 10:15 PM, Lennart Sorensen wrote:
Good crypto protocols are very much designed to not be trivial to break even with some known plain text. It is a known obvious attack so they are designed to protect against exactly that.
Yep, they've been doing that for centuries. With a polyalphabetic cipher, each time a letter occurs in the plain text, a different letter is used in the cipher text. This makes it impossible to use the statistical methods used with monoalphabetic ciphers, where a plain text letter always has the same cipher text letter. https://en.wikipedia.org/wiki/Polyalphabetic_cipher