E mail Security

In public key cryptosystem _____ keys are used for encryption and decryption.

• Same

• Different

• Encryption Keys

• None of the mentioned

Pretty good privacy program is used for

• Electronic mails

• File encryption

• Electronic mails & File encryption

• None of the mentioned

A cryptographic hash function has variable output length.

• True

• False

S/MIME is abbreviated as __________________

• Secure/Multimedia Internet Mailing Extensions

• Secure/Multipurpose Internet Mailing Extensions

• Secure/Multimedia Internet Mail Extensions

• Secure/Multipurpose Internet Mail Extensions

IPSec is designed to provide security at the _________

• Transport layer

• Network layer

• Application layer

• Session layer

In tunnel mode, IPSec protects the ______

• Entire IP packet

• IP trailer

• IP payload

• IP header

Pretty good privacy (PGP) is used in ______

• Browser security

• Email security

• FTP security

• WiFi security

____________ operates in transport mode or the tunnel mode.

• IPSec

• PGP

• SSL

• None of the above

____________ was invented by Phil Zimmermann

• IPSec

• PGP

• SSL

• None of above

In PGP, to exchange e-mail messages, a user needs a ring of _______ keys.

• secret

• public

• either (a) or (b)

• both (a) and (b)