self-synchronizing stream cipher

The encription function can be described by the following:
Sigma_i=( c_i-t, c_i-(t+1), ... , c_i-1),
z_i = g(sigma_i, k),
c_i = h(z_i, m_i)
where sigma₀ is the non-secret initial state, k is the key, g is the function that produces the keystream z_i, and h is the output function.

Properties:

1. Self-synchronization, possible to resynch if ciphertext digits are inserted or deleted beacuse it's operating on a fixed number of ciphertext digits.
2. Limited error propagation, if the ciphertext block is size t (see above) only t digits are effected if a digit is inserted, changed, or deleted. The stream will resynch on the next block
3. active attacks
   Property 2 implies that the attacker can corrupt t digits by corrupting a single one in the stream, thereby increasing the likely hood that the attack will be detected. It is a consequence of property 1 that the dection of an insertion, deletion, or replay attack will be harder to detect.
4. Diffusion of plaintext statistics