自从人类有了通信的需要以来,怎样在通信中保密以及如何破译敌方的密码就引起了广泛的兴趣。保密通信不仅在军事、国防等领域发挥独特作用,而且在经济和私人通信等方面也日益重要。随着电信业的全球化,以及多媒体技术在信息领域的广泛应用,在高度串接的宽带光学网络中,信息安全性越来越成为重要的热门课题。例如,未来可使用视频网络来召开重要 Since mankind had the need for communication, it has attracted a great deal of interest in how to keep secrets in communication and how to decipher the enemy’s password. Confidentiality communication not only plays a unique role in the fields of military affairs and national defense, but also is increasingly important in economic and private communications. With the globalization of telecommunication industry and the wide application of multimedia technology in the field of information, information security has increasingly become an important hot topic in highly concatenated broadband optical networks. For example, the future can use video networks to hold important