CISSP-ISSMP · Question #216
CISSP-ISSMP Question #216: Real Exam Question with Answer & Explanation
The correct answer is B: PGP. 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
Question
Which of the following are the ways of sending secure e-mail messages over the Internet? Each correct answer represents a complete solution. Choose two.
Options
- ATLS
- BPGP
- CS/MIME
- DIPSec
Explanation
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 A 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).
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