@ARTICLE{Li:ChaoticCipher:PLA2001, author = {Shujun Li and Xuanqin Mou and Yuanlong Cai}, title = {Improving Security of a Chaotic Encryption Approach}, journal = {Physics Letters A}, year = {2001}, volume = {290}, number = {3-4}, pages = {127-133}, doi = {10.1016/S0375-9601(01)00612-0}, note = {preprint available online at \url{http://www.hooklee.com/pub.html}}, }