Question Details

Public key cryptography





1. Public key cryptography is so-named because:
a. It is the world standard for HTTPS
b. It works on all popular computer operating systems
c. It uses an encryption key that can be released to the public
d. The encryption algorithms reside in the public domain


2. A security manager is searching for an encryption algorithm to be used
to encrypt data files containing sensitive information. Which of the
following algorithms should NOT be considered:
a. FISH
b. Twofish
c. Blowfish
d. CAST


3. A particular encryption algorithm transforms plaintext to ciphertext by
XORing the plaintext with the encryption key. This is known as:
a. Electronic codebook
b. Cipher block chaining
c. Block cipher
d. Stream cipher


4. Two parties that have never communicated before wish to send
messages using symmetric encryption key cryptography. How should the
parties begin?
a. The receiving party should send its public encryption key to the
transmitting party.
b. Each party should exchange public encryption keys.
c. Each party should send the encryption key via the communications
channel to the other party.
d. One party should transmit the encryption key via an out of band
communications channel to the other party.


5. Two parties that have never communicated before wish to send
messages using asymmetric key cryptography. How should the parties
begin?
a. The receiving party should send its private encryption key to the
transmitting party.
b. The transmitting party should send its private encryption key to the
receiving party.
c. The receiving party should send its public encryption key to the
transmitting party.
d. The transmitting party should send its public encryption key to the
receiving party





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