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You cannot and should not be able to use a hash or rainbow table for encrypted messages. If that is possible (you don't use a nonce), then your encryption is br
by tutfbhuf 5y ago
You cannot and should not be able to use a hash or rainbow table for encrypted messages. If that is possible (you don't use a nonce), then your encryption is broken since many common messages can be looked up in a rainbow table and you can use replay attacks.
- mimi89999 5y agoThat would have to happen on the device before encryption or after decryption.
- Mindwipe 5y agoWhatapp's client applications already do this before encryption to check against a list of hashes of child abuse material.
- tutfbhuf 5y agoThis is of course great, but such hash based filters for images or videos can be circumvented easily by just flipping one bit (without corrupting the file). I guess what we really need is some kind of ML trained filter that has a great rate of success and a very low false positive rate.