additional practice

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

B. Diffie-Hellman

C. Chaskey

Symmetric Block

Blowfish and Twofish are both _ ciphers with common key sizes of 128, 192, or 256 bits.

A. symmetric block

B. symmetric stream

C. asymmetric

RC5

_ is a symmetric block cipher that uses block sizes of 32, 64, or 128 bits and boasts a variable key size up to 2048 bits.