摘要： 在介绍S/Key一次性口令认证系统的基础上，指出S/Key系统的两个重大缺陷，并针对每一个缺陷提出了改进方案，提出了一种新的改进的一次性口令认证系统E-S/Key(Enhanced-S/Key)，并分析了新认证系统的安全性。

关键词: 一次性口令, 认证, Hash函数

Abstract: In this paper , two fatal defects of S/Key system are analysed on the foundation of introduction of S/Key which is a one-time password authentication system, and improvement schemes are given according to each defect. A kind of new and improved one-time password authentication system,E-S/Key(enhanced S/Key) is put forward and the security is analysed.

中图分类号: 

• TP393.08