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Which type of key is used to sign an e-mail message in a PKI framework?
Receiver's public key
Receiver's private key
Sender's private key
Sender's public key
A digital signature is an encrypted hash of a message and is always encrypted with sender's private key. Or to put it another way, encryption and signing are the two "private" steps in a Public Key Infrastructure (PKI) framework while decrypting and verifying are "public".
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