2. Lets consider the stream cipher RC4, but instead of the full 256 bytes, we will use 8 x 3-bits. That is, the state vector S is 8 x 3-bits. We will operate on 3-bits of plaintext at a time since S can take the values 0 to 7, which can be represented as 3 bits.

Assume we use a 4 x 3-bit key of K = [1 2 3 6]. And a plaintext P = [1 2 2 2]

The first step is to generate the stream.

Initialise the state vector S and temporary vector T. S is initialised so the S[i] = i, and T is initialised so it is the key K (repeated as necessary).

S = [0 1 2 3 4 5 6 7]

T = [1 2 3 6 1 2 3 6]