C839v5/D334 Additional Practice Exam Questions and Answers
128 - -The hash value in bits for MD5 is ____.
A. 128
B. 160
C. 256
-variable; fixed - -Hashing involves taking a _____ length input and producing a _____ length
output (message digest).
A. fixed; fixed
B. variable; fixed
C. fixed; variable
-160 - -The hash value in bits for SHA-1 is ____.
A. 128
B. 160
C. 256
-128 - -The hash value in bits for MD4 is ____.
A. 128
B. 160
C. 256
-Transport - -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
-Tunnel - -IPSec ______ mode involves encryption from gateway to gateway, i.e. just through
the public network space.
A. Tunnel
B. Transport
C. Trusted
-Tunnel
Remember, with tunnel mode, encryption does not happen until just before it leaves the
local network. Traffic likely remains unencrypted between the end user device and the
local network boundary. - -A security analyst on a local network using monitoring tools is
likely to only be able to read contents of traffic encrypted using IPSec ______ mode.
A. Tunnel
B. Transport
C. Trusted
,-Chaskey - -_____ is a lightweight cryptography method for signing messages (MAC). It
boasts a relatively undemanding hardware implementation (only ~3,333 gates required at
1MHz clock rate) making it suitable for IoT implementation.
-128 - -Chaskey has a key size of _____ bits.
A. 256
B. 128
C. 80
-salt - -A weakness of one-way hashing is that the same piece of plaintext will result in the
same ciphertext unless _____ is applied.
A. Salt
B. Ash
C. Ether
-40 - -The minimum recommended key size to use with RC4 is _____ bits.
A. 40
B. 20
C. 64
-2048 - -RC4 is a symmetric stream cipher with a variable key size up to a max of _____ bits.
A. 256
B. 2048
C. 1024
-Data Encryption Standard (DES) - -_____ has a block size of 64 bits, key size of 56 bits, and
16 rounds of substitution & transposition.
A. DES
B. AES
C. RC4
-rainbow table - -A(n) _____ is a collection of precomputed hash values of actual plaintext
passwords used for password cracking.
A. initialization vector
B. key pair
C. rainbow table
-.cer - -_____ is a common x.509 certificate file type that is used with both PEM and DER
formats.
A. .crt
B. .cer
C. .der
-Triple Data Encryption Standard (3DES) - -_____ has a block size of 64 bits, key size of 112
bits, and 48 rounds of substitution & transposition.
, A. DES
B. RSA
C. 3DES
-128, 192, 256 - -Key sizes used with the Advanced Encryption Standard (AES) include
_____. _____, or _____.
A. 10, 12, 14
B. 128, 192, 256
C. 32, 64, 80
-128 - -The Advanced Encryption Standard (AES) operates using _____ bit blocks.
A. 128
B. 192
C. 256
-80 - -Skipjack is a symmetric block cipher that uses a ______ bit key.
A. 64
B. 80
C. 112
-128-bit key size; 64-bit IV - -Enocoro operates with a key size of ______ bits and an
initialization vector (IV) of _____ bits.
A. 80; 80
B. 128; 64
C. 80; 64
-64 - -Skipjack has a block size of _____bits.
A. 64
B. 80
C. 128
-Light-weight hashing algorithms - -PHOTON, SPONGENT, Lesamnta-LW, and Quark are
examples of light-weight _____.
A. hashing algorithms
B. public-key algorithms
C. symmetric block ciphers
-IDEA - -_____ has a block size of 64 bits, key size of 128 bits, and >17 rounds of
substitution & transposition.
A. RSA
B. DSA
C. IDEA
-RSA - -_______ is a partially homomorphic crypto system that leverages prime number
characteristics, operates with a 1024-4096 bit variable key size, and 1 round.
A. RSA
128 - -The hash value in bits for MD5 is ____.
A. 128
B. 160
C. 256
-variable; fixed - -Hashing involves taking a _____ length input and producing a _____ length
output (message digest).
A. fixed; fixed
B. variable; fixed
C. fixed; variable
-160 - -The hash value in bits for SHA-1 is ____.
A. 128
B. 160
C. 256
-128 - -The hash value in bits for MD4 is ____.
A. 128
B. 160
C. 256
-Transport - -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
-Tunnel - -IPSec ______ mode involves encryption from gateway to gateway, i.e. just through
the public network space.
A. Tunnel
B. Transport
C. Trusted
-Tunnel
Remember, with tunnel mode, encryption does not happen until just before it leaves the
local network. Traffic likely remains unencrypted between the end user device and the
local network boundary. - -A security analyst on a local network using monitoring tools is
likely to only be able to read contents of traffic encrypted using IPSec ______ mode.
A. Tunnel
B. Transport
C. Trusted
,-Chaskey - -_____ is a lightweight cryptography method for signing messages (MAC). It
boasts a relatively undemanding hardware implementation (only ~3,333 gates required at
1MHz clock rate) making it suitable for IoT implementation.
-128 - -Chaskey has a key size of _____ bits.
A. 256
B. 128
C. 80
-salt - -A weakness of one-way hashing is that the same piece of plaintext will result in the
same ciphertext unless _____ is applied.
A. Salt
B. Ash
C. Ether
-40 - -The minimum recommended key size to use with RC4 is _____ bits.
A. 40
B. 20
C. 64
-2048 - -RC4 is a symmetric stream cipher with a variable key size up to a max of _____ bits.
A. 256
B. 2048
C. 1024
-Data Encryption Standard (DES) - -_____ has a block size of 64 bits, key size of 56 bits, and
16 rounds of substitution & transposition.
A. DES
B. AES
C. RC4
-rainbow table - -A(n) _____ is a collection of precomputed hash values of actual plaintext
passwords used for password cracking.
A. initialization vector
B. key pair
C. rainbow table
-.cer - -_____ is a common x.509 certificate file type that is used with both PEM and DER
formats.
A. .crt
B. .cer
C. .der
-Triple Data Encryption Standard (3DES) - -_____ has a block size of 64 bits, key size of 112
bits, and 48 rounds of substitution & transposition.
, A. DES
B. RSA
C. 3DES
-128, 192, 256 - -Key sizes used with the Advanced Encryption Standard (AES) include
_____. _____, or _____.
A. 10, 12, 14
B. 128, 192, 256
C. 32, 64, 80
-128 - -The Advanced Encryption Standard (AES) operates using _____ bit blocks.
A. 128
B. 192
C. 256
-80 - -Skipjack is a symmetric block cipher that uses a ______ bit key.
A. 64
B. 80
C. 112
-128-bit key size; 64-bit IV - -Enocoro operates with a key size of ______ bits and an
initialization vector (IV) of _____ bits.
A. 80; 80
B. 128; 64
C. 80; 64
-64 - -Skipjack has a block size of _____bits.
A. 64
B. 80
C. 128
-Light-weight hashing algorithms - -PHOTON, SPONGENT, Lesamnta-LW, and Quark are
examples of light-weight _____.
A. hashing algorithms
B. public-key algorithms
C. symmetric block ciphers
-IDEA - -_____ has a block size of 64 bits, key size of 128 bits, and >17 rounds of
substitution & transposition.
A. RSA
B. DSA
C. IDEA
-RSA - -_______ is a partially homomorphic crypto system that leverages prime number
characteristics, operates with a 1024-4096 bit variable key size, and 1 round.
A. RSA
