Evaluating an argument and questioning: the code book07: 10which sentence is most relevant to the argument thatzimmermann's pgp was easy to use? read the excerpt from the code bookby this stage, sending a pgp encrypted message isbecoming quite complicated. the idea cipher is beingused to encrypt the message, rsa is being used toencrypt the idea key, and another stage of encryptionhas to be incorporated if a digital signature is required. however, zimmermann developed his product in such away that it would do everything automatically, so that aliceand bob would not have to worry about the mathematics. to send a message to bob, alice would simply write here-mail and select the pgp option from a menu on hercomputer screen. next she would type in bob's name, then pgp would find bob's public key and automaticallyperform all the encryption. at the same time pgp woulddo the necessary jiggery-pokery required to digitally signthe message. upon receiving the encrypted message, bob would select the pgp option, and pgp would decryptthe message and verify the author. nothing in pgp wasoriginal-diffie and hellman had already thought of digitalo by this stage, sending a pgp encrypted message isbecoming quite complicated. the idea cipher is being used to encrypt the message, rsa is being used to encrypt the idea key, andanother stage of encryption has to be incorporated if adigital signature is required. to send a message to bob, alice would simply writeher e-mail and select the pgp option from a menu onher computer screen. o nothing in pgp was original-diffie and hellman hadalready thought of digital signatures and othercryptographers had used a combination of symmetricand asymmetric ciphers to speed up encryptionsubmitnextsave and exitmark this and return