使用SHA1加密 [英] Encryption using SHA1

问题描述

我正在开发一个大型应用程序，并且当数据在不同大陆的两台计算机之间传输时，我需要加密.我从未从事过加密工作.我想要一个可以在PHP/Ruby/Python中处理而没有任何依赖关系的简单加密.

I am developing a large application and i need encryption when a data is traveling between two machines in different continents. I have never worked on encryption. I want a simple encryption which can be handled in PHP / Ruby / Python without any dependencies.

因此，我决定使用HMAC SHA1.

So i decided to use HMAC SHA1.

$pad=hash_hmac("sha1","The quick brown....","mykey");

这是我在互联网上进行一些研究后发现的.

This is what i found out after some research on the internet.

如果有人不知道密钥，解密它有多难?另外，还有其他替代方法吗?

How hard it is to decrypt it if someone doesn't know the key? Also, any alternatives to this?

更新-感谢所有答复.问题解决了.

UPDATE - thanks for all the responses. Problem solved.

推荐答案

即使知道密钥也无法解密. HMAC SHA1是一种密钥哈希算法，不是加密.

It's impossible to decrypt it, even if you know the key. HMAC SHA1 is a keyed hash algorithm, not encryption.

散列是一种加密的单向函数，无论输入的长度如何，该函数始终会生成相同长度的值(我认为SHA1是128位).哈希的要点是，给定输出值，在计算上找不到要产生该输出的输入值是不可行的.密钥哈希用于防止彩虹表攻击.即使知道密钥，也无法撤消哈希过程.

A hash is a cryptographic one-way function that always generates a value of the same length (I think SHA1 is 128-bits) regardless of the length of the input. The point of a hash is that, given the output value, it's computationally infeasible to find an input value to produce that output. A keyed hash is used to prevent rainbow table attacks. Even if you know the key you can't reverse the hash process.

对于加密，您需要查看AES.

For encryption you want to look at AES.

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