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I encountered a scheme where a hash of a message was used to encrypt the same message:

result = Encrypt(message=m, key=hash(m))

Specifically:

result = AES-256-CBC(message=random(1..2^132), key=SHA3(message))

Is it possible for an adversary to decrypt the message if he knows the result?

kelalaka
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Konstantin
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    If you can guess the message, you can confirm your guess, nothing more should be possible. – SEJPM Oct 24 '19 at 13:10
  • Note that I closed this question as dupe without looking at who answered the previous question (I was among the answerers). – Maarten Bodewes Oct 24 '19 at 19:32

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