1
$\begingroup$

If one wants to keep the receiver's name non encrypted, but it also appears in the encrypted message - will it leak information? (other than the receiver's name, of course.)

Let's assume a "bad" case - where there are many messages to the same person, and that the name in the encrypted message will always appear in the exact same place, and will be publicly known to be there.

Of course it doesn't matter whether it's a name, or any other information that will be present in both encrypted, and non-encrypted form.

Improve this question
$\endgroup$
1
  • $\begingroup$ As long as your encryption is secure know plaintexts don't help the attacker. $\endgroup$ – CodesInChaos Dec 2 '14 at 14:10
2
$\begingroup$

No, it won't "leak" information, as long as you're using a modern symmetric algorithm that's resistant to known-plaintext attacks.

However, depending on the encryption mode used (and whether there's integrity checking or not), there can be other security implications, such as the data in the known spot being substituted.

Improve this answer
$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.