This paper introduces the main components of key escrow encryption systems and their functions, and includes the general model for key escrow encryption systems by relation between components, finally analyses security of key escrow encryption systems.

• 本文在介绍密钥托管加密系统各部分组成及其功能的基础上，讨论了各部分之间的关系，并总结出密钥托管加密系统的一般模型，然后据此对密钥托管加密系统环境的安全性进行了分析。