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You and your co-worker use RSA public-key for encryption and authentication. How can you confirm the content authenticity and origin authenticity of the digitally signed e-mail from your co-worker?
You should have the sender's private key.
You should have both public and private keys of the sender.
You should have the sender's public key.
Using your private key is enough.
You can confirm the origin of the message by deciphering it with the sender's public key.
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