求助一个160bit的加密算法是什么?

如下图,求助 F运算 和 G运算 的算法是什么,谢谢~

图片说明

1个回答

SHA-1算法代码和解释:
https://blog.csdn.net/qq_35649764/article/details/83859132

这个图的含义,是定义了密码加密保存,和密码验证两个流程。其中密码加密保存用了SHA-1算法,这是一种散列算法,不可逆。保证在设备上即使拿到密文C,也还原不出明文A。

你的问题在密码验证流程。按这个流程看,意图是把验证过程的内容加密传输,需要能够解密,在未指定具体加密算法的情况下,具备解密功能的算法都可以。比如DES,AES,RSA。

假设用RSA,那么密文D相当于是公钥。
G运算应该包含两步:
1. 用随机数B生成密文C,同上面的密码加密过程。
2. 将密文C用公钥(密文D)再次加密,生成密文E。

F运算就是生成密钥的过程。
密文E经过解密后,得到的是密文C,再与设备上原来保存的密文C比对,间接判断明文A是否与之前保存的密码一致。

u014627520
lcedbug 那就有点难搞了,谢谢啦~
大约一个月之前 回复
bobhuang
bobhuang 回复lcedbug: 因为密文C/D/E都是160位,猜测F和G是自定义的算法,而不是常见的强加密算法。如果在不知道算法的情况下破解的话,只能用特殊的密文C和明文A去逐步尝试了。
大约 2 个月之前 回复
u014627520
lcedbug 谢谢!您的密码验证过程讲得很详细清晰,我能够理解!我现在是想在设备添加这个功能,但是因为不清楚跟上位机之间的具体解密算法,所以进行不下去~ DES, AES, RSA这些算法密钥都不是160bit的,猜不出怎么算的
大约 2 个月之前 回复
bobhuang
bobhuang 回复lcedbug: 按我的理解,把解释补充到回复中了。
大约 2 个月之前 回复
u014627520
lcedbug 加密的算法我已经知道是SHA_1, 但是解密使用的算法并不知道,猜测也是SHA_1,但是找不出输入是什么
大约 2 个月之前 回复
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