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Sender generates a message. • Sender generates a session key (-bits long) • Message is encrypted using CAST- (or IDEA, TDEA) using the session key • The session key is encrypted using RSA and the recipient's public key. The encrypted session key is prepend to the message • The receiver uses RSA and its private key to recover the session key. • Using the session key, the receiver decrypts the message.

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1. Sender generates a message. • Sender generates a session key (-bits long) • Message is encrypted using CAST- (or IDEA, TDEA) using the session key • The session key is encrypted using RSA and the recipient's public key. The encrypted session key is prepend to the message • The receiver uses RSA and its private key to recover the session key. • Using the session key, the receiver decrypts the message.





 
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