Question

by this stage, sending a pgp encrypted message is becoming quite complicated. the idea cipher is being used to encrypt the message, rsa is being used to encrypt the idea key, and another stage of encryption has to be incorporated if a digital signature is required. however, zimmermann developed his product in such a way that it would do everything automatically, so that alice and bob would not have to worry about the mathematics. to send a message to bob, alice would simply write her e - mail and select the pgp option from a menu on her computer screen. next she would type in bobs name, then pgp would find bobs public key and automatically perform all the encryption. at the same time pgp would do the necessary jiggery - pokery required to digitally sign the message. upon receiving the encrypted message, bob would select the pgp option, and pgp would decrypt the message and verify the author. nothing in pgp was original—diffie and hellman had already thought of digital signatures and other cryptographers had used a combination of symmetric and asymmetric ciphers to speed up encryption—but zimmermann was the first to put everything together in one easy - to - use encryption product, which was efficient enough to run on a moderately sized personal computer. which fact most effectively supports the claim that pgp can be used by an ordinary person? pgp is based on complicated mathematics. pgp works efficiently on a personal computer. pgp incorporates a digital signature. pgp is used to encrypt digital messages.

Explanation:

The text states that Zimmermann made PGP automatic so users don't need to worry about the math. Also, it can run on a personal - computer. The fact that it works efficiently on a personal computer implies ease - of - use for ordinary people as personal computers are commonly owned. The other options focus on features like encryption methods or digital signatures which don't directly relate to ease - of - use for ordinary users.

Answer:

PGP works efficiently on a personal computer.