alt Hacker NewsYou would still expect some amount of file structure, ex byte headers or something at the beginning/end of file. no?
Replies
throwawaysoxjje • yesterday at 2:49 PM
I’d expect the greater length of the encrypted data (which should look random) vs the structured header/footer to rapidly push the Shannon entropy to the maximum
wang_li • yesterday at 2:56 PM
No. Why would you? Encrypted data should look no different than random. The app figures out if it is the app's data after it attempts to decode it.
That would be expected for encodings or container file formats. Straight-up encryption like AES produces results that are visually indistinguishable from random data.