You acknowledge in your question that an encrypted file will closely simulate random noise.
If the encryption method was perfect, the (uncorrupted) file would be indistinguishable from random noise. (No encryption is perfect!)
Corruption could entail any or all of:
- The inversion of a single bit somewhere in the file.
- The inversion of every bit in the file.
- The removal of a single byte somewhere in the file.
- The removal of every byte in the file.
- The insertion of a single extra byte in the file.
- The insertion of any number of extra bytes within the file.
- The replacement of a single byte in the file.
- The replacement of every byte within the file.
- Other...
Bottom line: unless a checksum of the encrypted file was generated at the same time the file was encrypted; and you know how that checksum was generated; and you have access to the checksum; and you can guarantee that the checksum could not itself have been corrupted; you might just as well be asking how to reverse time for all the possibility of getting a useful answer to your question.
Stop pursuing the solution to an impossible problem.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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