有没有办法检查文件是否加密？ [关闭]

Question

Is there a way to check if a file is encrypted?

Answer 1

Assuming text file.

You can measure character distribution. If characters appear in numbers close to each other (i.e. a small variance) then you most likely have an encrypted file.

Of course this can only be applied to large enough files. You can't tell if a file containing only "ABC" is encrypted or not.

Assuming binary data.

Similar to the above, but it's a little harder to explain.