In this paper we will take a close look at four most important modes in cryptographic algorithm:Elec- tronic Code Book mode(ECB),Cipher Block Chaining mode(CBC),Cipher Feedback mode(CFB)and Output Feed- back mode(OFB).

• 论文对四种最主要的加密算法模式,即电子编码本模式(Electronic Code Book,ECB)、密码分组链接模式(Cipher Block Chaining,CBC)、密码反馈模式(Cipher Feedback,CFB)和输出反馈模式(Output Feedback,OFB)进行了讨论。