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What determines the hashing algorithm used form mail signing? I sign an mail. it is first run through a hashing algorithm and next encrypted with my private key. Bob, the receiver will decrypt it with the corresponding public key, but how does we/ his mail client know what hashing algorithm to run through the message to compare the hashes ?

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  • What kind of mail signing are you talking about?
    – user
    Commented Mar 15, 2017 at 11:57
  • @MichaelKjörling I'm referring to digitally signed messages support.office.com/en-ie/article/…
    – cyzczy
    Commented Mar 15, 2017 at 12:21
  • Ah, so you're referring to S/MIME.
    – user
    Commented Mar 15, 2017 at 14:17

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