Encrypting a Message with PGP

signature

}

Compressed message.

with or without signature

Encrypt using

IDEA

Generate one-time

session key using

random number

generator

Encrypt session

key using RSA

Alice

Joy

Mike

Carol

receiver’s public key

Encrypted copy of

session key added

(RSA) using receiver’s

public key

sender’s public

key ring

step1: PGP generates a session key and encrypts the message .

step2 : PGP fetches the recipient's public key from your public key ring

using his USER ID to encrypt the session key .

step3: The session key component of message is constructed .