@PHDTHESIS{Li:Dissertation2003, AUTHOR = {Shujun Li}, TITLE = {Analyses and New Designs of Digital Chaotic Ciphers}, SCHOOL = {School of Electronic and Information Engineering, Xi'an Jiaotong University}, YEAR = {2003}, address = {Xi'an, China}, month = {June}, note = {both Chinese and English editions available online at \url{http://www.hooklee.com/pub.html}}, }