3 ms·

What if in the header of the file they put an md5sum that is not encrypted? I don't think that would represent a data leak, and you could then dedupe based on

• sp332 15y ago
  But only one of the two users could decrypt the block - useless. downvoters: If I encrypt a plaintext, and you encrypt the same plaintext, we'll have different ciphertexts. If we detect that we encrypted the same plaintext, how do we deduplicate? (Also, I would consider that a leak.)