压缩和加密时，是先压缩，还是先加密? [英] When compressing and encrypting, should I compress first, or encrypt first?

问题描述

如果我要对文件进行 AES 加密，然后对其进行 ZLIB 压缩，那么压缩效率会比我先压缩然后加密的效率低吗?

If I were to AES-encrypt a file, and then ZLIB-compress it, would the compression be less efficient than if I first compressed and then encrypted?

换句话说，我应该先压缩还是先加密，还是有关系?

In other words, should I compress first or encrypt first, or does it matter?

推荐答案

先压缩.加密文件后，您将生成不可压缩的随机数据流.压缩过程取决于在数据中找到可压缩的模式.

Compress first. Once you encrypt the file you will generate a stream of random data, which will be not be compressible. The compression process depends on finding compressible patterns in the data.

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