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For sending the session key, the PGP uses a symmetric algorithm. True or false?
True
False
PGP creates the sender's session key. PGP already knows about the recipient's public key from an earlier exchange. PGP encrypts the plain text message to send (i.e. MIME message) using the session key to a cipher text. PGP encrypts the the session key and the cipher text together with the recipient's public key as one large cipher text (note: the cipher text is encapsulated in this large cipher text) and sends this to the recipient.
The receiver receives the message and decrypts the large cipher text into the sender's cipher text with sender's session key with the receiver's public key. PGP applies the sender's session key to decryption the sender's cipher text.
Since the cipher text is encrypted and decrypted with two keys to encrypt and two keys to decrypt in the same direction, PGP uses a symmetric algorithm.
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