Enterprise Cloud Security and Governance

Stream cipher

In a stream cipher, each plaintext digit is encrypted one at a time with the corresponding digit of the secret key and the result is the ciphertext.

In practice, the digit is typically a bit and XOR used for combination operations.

This is a basic XOR table:

A	B	Q
0	0	0
0	1	1
1	0	1
1	1	0

Let's assume that we have a word kplabs with the corresponding representation 0110.

If we want to encrypt this word with stream cipher, and assuming that XOR operations are performed, then it will be as follows:

Key = 1100