Abstract: General Methods of cryptanalysis are introduced. Seome specific techniques of deciphering password are discussed, including cleaning the password, using the backdoor, cyber cheating, guessing by social engineering, mathematical analyzing, and exhaustive attacking, etc.

Key words: decryption, electronic evidence, identification

摘要： 简述了密码分析的一般方法，讨论了密码破解的几种具体实现方法，包括清除密码、后门密码、网络窃听、社会工程、计算密码、暴力破解等。

关键词: 密码破解, 电子证据, 鉴定