C839V5/D334 ADDITIONAL PRACTICE EXAM QUESTIONS ND ANSWERS

C839V5/D334 ADDITIONAL PRACTICE
128 - answer- The hash value in bits for MD5 is ____.
A. 128
B. 160
C. 256

variable; fixed - answer- Hashing involves taking a _____ length input and producing a
_____ length output (message digest).
A. fixed; fixed
B. variable; fixed
C. fixed; variable

160 - answer- The hash value in bits for SHA-1 is ____.
A. 128
B. 160
C. 256

128 - answer- The hash value in bits for MD4 is ____.
A. 128
B. 160
C. 256

Transport - answer- IPSec ______ mode involves "end-to-end" encryption; i.e. data
remains encrypted from the time it leaves a sender's device to the time it arrives at the
receiver's device.
A. Tunnel
B. Transport
C. Trusted

One-time pad - answer- _____ is considered to be unbreakable since it only uses its
cipher code once.

ASCII - answer- _____ encoding involves 8-bit values and supports up to 256
characters.

collision - answer- A _____ occurs when two different input values produce the same
hash signature.
A. collision
B. rainbow
C. tunnel

UTF-16 - answer- _____ is an encoding method with 16-bit values and supports up to
65,536 characters.

,80; 80 - answer- The light-weight symmetric stream cipher Trivium operates with a key
size of ______ bits and an initialization vector (IV) of _____ bits.
A. 80; 80
B. 64; 128
C. 128; 64

hardware security module (HSM) - answer- A _____ is a tamper-evident and intrusion-
resistant physical device that safeguards and manages cryptographic keys and provides
cryptographic processing.
A. TPM
B. HSM
C. DES

trusted platform module (TPM) - answer- A _____ is a dedicated processor that handles
hardware-level encryption; allows the use of full disk encryption on a hard drive in a
manner that minimizes the impact on system performance.
A. TPM
B. HSM
C. PRNG

HMAC - answer- _____ is a message authentication code (MAC) that can be used to
verify the integrity and authentication of the message. It involves hashing the message
with a secret key, and thus differs from standard hashing, which is purely a one-way
function.
A. HMAC
B. Rainbow table
C. Key escrow

Symmetric - answer- _____ ciphers make use of a single secret key for both encryption
and decryption.

01011 - answer- Solve by applying the binary XOR function.
11011
10000

A. 11011
B. 10000
C. 01011

10000 - answer- Solve by applying the binary AND function.
11011
10000

A. 11011
B. 10000
C. 01011

, 11011 - answer- Solve by applying the binary OR function.
11011
10000

A. 11011
B. 10000
C. 01011

1 - answer- 15 mod 7 = _____
A. 5
B. 2.14
C. 1

5 - answer- 12 mod 7 = _____
A. 5
B. 1.7
C. 1

Block, Stream - answer- The two types of symmetric ciphers are _____ and _____
A. Block, Stream
B. CTR, DES
C. Active, Passive

Public key - answer- When encrypting data using asymmetric cryptography, which key
should be shared or distributed to facilitate decryption?
A. Secret key
B. Private key
C. Public key

Block cipher modes - answer- _____ are used to manage how blocks of data are
processed in symmetric encryption.
A. Stream ciphers
B. Block cipher modes
C. Padding

CFB, OFB, CTR - answer- Which symmetric block cipher modes enable the block
cipher to operate like a stream cipher?
A. ECB, DES, ECC
B. CFB, OFB, CTR
C. DSA, RSA, RC6

S-boxes - answer- Symmetric block ciphers make use of _____ to perform substitution
as part the encryption process.
A. p-boxes
B. s-boxes