New answers tagged man-in-the-middle
DrLecter is right. It all boils down to making sure to use the right public key. In fact this is the same for any public key cryptosystem be it RSA elGamal or ECC variants thereof. A MAC or whatever other construction local to your system won't do the job. The MAC e.g. can only make sure the last "editor" of the message knew the symmetric key the message ...
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