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The Vernam cipher

Opublikowany przez w One-time key encryption system ·
Tags: Vernam cipher
Let a ⊕ b denote the bitwise exclusive-or of two binary arguments: a, b.

The one-time key encryption system is defined as follows:

First, we specify the integer l > 0. We then define the spaces of the message M, key K, and ciphertext C. They are all equal to {0, 1} l.

The key generation algorithm works by selecting the binary string K = {0, 1} l according to the uniform probability distribution.

Encryption works as follows: we use the key k ={0, 1} l and the message m ={0, 1} l where the result is defined as c =k ⊕ m.

The opposite operation is as follows: we give the key k = {0, 1} l and the ciphertext c =  {0, 1} l.
For the final we get m = k ⊕ c.

Klucz jednorazowy a sekretarki

Opublikowany przez w Historia kryptografii ·
Tags: Klauzulaściśle fajne
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