  The combinative applications of one-way coupled map lattice (OCML) and some
simple algebraic operations have demonstrated to be able to construct the best
known chaotic cryptosystem with high practical security, fast encryption speed,
and excellent robustness against channel noise. In this paper, we propose a
differential-like chosen cipher attack to break the prototypical system
cooperating with INT and MOD operations. This cryptographic method exploits the
weakness that the high-dimensional cryptosystem degenerates to be
one-dimensional under constant driving, therefore, is no more sensitive to the
slight perturbation on the driving after convergence. The experimental results
show that this method can successfully extract the key within just hundreds of
iterations. To the best of our knowledge, it is the first time to present
successful cryptanalysis on such a cryptosystem. we also make some suggestions
to improve the security in future versions.
