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this post was submitted on 10 Aug 2023
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It's not compressible at all. You will end-up with a file that is larger than the original.
Whether compressing before you encrypt leaks information, or not compressing is what leaks, or it's irrelevant is complicated to decide and depends on the details of what you are doing. But encrypting and then compressing is a bit worse than useless, and always a mistake.
Also might be faster to encrypt a compressed file, since it will be smaller?
Yes.
Well, encryption tends to be either a very fast operation or something with a slow stage that doesn't depend on the size of your data. So although this is technically true, it's also not relevant.