我想用3DES加密一段文本，大家推荐用什么模块好？

weiyi_cn

在Win2000 + ActivePerl的环境下
用
Benjamin Trott 的 Crypt-DES_EDE3
http://search.cpan.org/~btrott/Crypt-DES_EDE3-0.01/lib/Crypt/DES_EDE3.pm
还是
劉康民 的 Crypt-DES_EEE3
http://search.cpan.org/~gugod/Crypt-DES_EEE3-0.01/lib/Crypt/DES_EEE3.pm
？
好像加密算法略有不同
第一个是：encrypt-decrypt-encrypt
第二个是：encrypt-encrypt-encrypt
请教各位前辈了。

don

only different is EDE can be used as DES when three keys are same.


http://kingkong.me.berkeley.edu/~kenneth/courses/sims250/des.html

2.2 The 3DES Algorithm
        3DES uses the same basic machinery of Sec.2.1 three times over using 3 keys k1,k2,k3.The plaintext (M) is encrypted using k1. This result is encrypted with k2 and the result is then encrypted with k3 to get ciphertext (C). C = Ek3(Ek2(Ek1(M))).   This mode of using 3DES is called the DES-EEE mode since all three keys run in the encryption mode. The other mode is called DES-EDE where the second stage is run in decryption mode. i.e. C = Ek3(Dk2(Ek1(M))).

        The 3 keys may or may not be independent. For DES-EDE mode three options are defined

1. The keys k1, k2, and k3 are independent.

2. k1 and k2 are independent but k1 = k3

3. k1 = k2 = k3  - In this case, 3DES becomes backward compatible with DES.

weiyi_cn

呵呵，我还是倾向于用EDE。
其实只要有基本的DES模块什么3DES啦都可以自己写的。
我自己写了个“5DES”（EDEDE）
不过要自己拆分明文比较麻烦。
还不如用CBC省心。
我想用更好的Blowfish，但ActiveState不提供Windows下的模块