压缩和加密...哪个首先应用？ [英] Compression and Encryption... Which to apply first?

问题描述

我正在开发一个远程备份项目在C ...
我想发送数据和压缩以及加密数据。

但是我很困惑首先压缩还是先加密！

什么会更好？：

1. 压缩数据，然后对其加密
。

2. 加密数据，然后压缩

另外，我将使用zlib进行压缩。
我想知道使用哪个加密库...
有些人说libgcrypt是好的。
建议使用好的加密库（非常容易使用）...）：

或者这两个作业都有什么？ / p>

谢谢！

解决方案

>

任何良好的加密算法都会产生类似于压缩效果的随机数据。

I am working on a remote backup project in C... I want to send data and compress as well as encrypt the data.

However I am confused whether to compress first or encrypt first!

What will be better?:

1. Compress the data and then encrypt it
2. Encrypt the data and then compress it

Also I am going to use zlib for compression. And I am wondering which encryption lib to use... Some people say libgcrypt is good. Suggestion for good encryption libraries(very easy to use) will be appreciated... :)

or is there anything that does both of the jobs?

Thanks!

解决方案

You should compress before encrypting.

Any good encryption algorithm will produce random-like data that will not compress well.

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