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6

They are standards for encryption of mails, notable S/MIME and PGP. There is defined how the encrypted message gets encapsulated so that the mail client knows that it is encrypted. These encapsulations have a very specific Content-Type headers or at least specific markers in the content, i.e. markers like -----BEGIN PGP MESSAGE----- or Content-Type's ...


4

Encrypted data should have a relatively uniform distribution of randomness, so if notable portions of it fed through tests such as a chi-squared test don't end up showing as random, then it's unlikely it's encrypted. Since you have multiple messages, close attention to the first bytes of each message is also relevant because it'll give a chance to detect a ...



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