ISC2 Exam ISSEP Topic 4 Question 49 Discussion

Pretty Good Privacy (PGP) and Secure Multipurpose Internet Mail Extensions (S/MIME) are two ways

of sending secure e-mail messages over the

Internet. Both use public key cryptography, where users each possess two keys, a public key for

encrypting, and a private key for decrypting

messages. Because PGP has evolved from a free distribution, it is more popular than S/MIME.

Answer option C is incorrect. Transport Layer Security (TLS) is an application layer protocol that uses

a combination of public and symmetric

key processing to encrypt data.

Answer option D is incorrect. Internet Protocol Security (IPSec) is a standard-based protocol that

provides the highest level of VPN security.

IPSec can encrypt virtually everything above the networking layer. It is used for VPN connections

that use the L2TP protocol. It secures both

data and password.

IPSec cannot be used with Point-to-Point Tunneling Protocol (PPTP).