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- handle incoming encrypted messages from user to receive sensitive data, and to sign replies -> postman would need a GPG key too
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- ban keys from unknow users flooding -> counter, reseted when key added in DB
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- protect against replay (foo resending eavesdropped mail) -> store message IDs, but how to limit to a reasonnable timeframe ?
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- protect against intercepted mail with falsified headers (From/Reply-To/... could be tampered to get replies, reply tampered too, and then resent to avoid being detected)
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