WGU C839 Flash Cards for OA question & answers 100% correct updated 2022

WGU C839 Flash Cards for OA question & answers 100% correct
updated 2022


DES - correct answer 64 Bit Block - 56 Bit Key - 16 Rounds

AES - correct answer 128 Bit Block - 128, 192, 256 Bit Key - 10, 12, 14 Rounds

BlowFish - correct answer 64 Bit Block - 32 thru 448 Bit Key - 16 Rounds

TwoFish - correct answer 128 Bit Block - 1 thru 256 Bit Key - 16 Rounds

Serpent - correct answer 128 Bit Block 128, 192, 256 Bit Key - 32 Rounds

SkipJack - correct answer 64 Bit Block - 80 Bit Key - 32 Rounds

IDEA - correct answer 64 Bit Block - 128 Bit Key - 8.5 Rounds

Symmetric Block Ciphers - correct answer DES - AES - BlowFish - TwoFish - Serpent -
SkipJack - IDEA

Symmetric Block Ciphers with 64 Bit Block Size - correct answer DES - BlowFish -
SkipJack - IDEA

Symmetric Block Ciphers with 128 Bit Block Size - correct answer AES - TwoFish -
Serpent

Symmetric Block Ciphers with 128, 192, 256 Bit Key Size - correct answer AES -
Serpent

Symmetric Block Ciphers with 16 Rounds - correct answer DES - BlowFish - TwoFish

Symmetric Block Ciphers with 32 Rounds - correct answer Serpent - SkipJack

RC4 - correct answer 1 thru 2048 Bit Key Size & 1 Round (40 bit minimum
recommended)

FISH - correct answer Uses Lagged Fibonacci pseudorandom number generator

PIKE - correct answer Revised version of FISH to address known plaintext attack
vulnerabilities

Symmetric Stream Ciphers - correct answer RC4 - Fish - Pike

, Asymmetric Encryption Algos - correct answer RSA - ECC - El Gamal - DSA

RSA - correct answer Leverages prime number characteristics, 1024-4096 bit variable
key size, 1 round. Uses Trapdoor function to enable use for encryption and digital
signatures. One-way trapdoor functions can be inverted with knowledge of trapdoor
factorization information.

ECC - correct answer Leverages discrete logarithm characteristics

El Gamal - correct answer Used in recent versions of PGP

DSA - correct answer A Federal Information Processing Standard for digital signatures
(FIPS 186)

Hash Algos - correct answer MD5 - SHA1 - SHA256 - FORK256 - RIPEMD160 - GOST
- TIGER

MD5 - correct answer 128 Bit Hash Value

SHA1 - correct answer 160 Bit Hash Value

SHA256 - correct answer 256 Bit Hash Value

FORK256 - correct answer 256 Bit Hash Value

GOST - correct answer 256 Bit Hash Value

TIGER - correct answer 192 Bit Hash Value

Key Exchange Algos - correct answer Diffie Hellman (DH) - Menezes-Qu-Vanstone
(MQV) - Key Exchange Algorithm (KEA) - Elliptic Curve DH (ECDH)

RSA Encryption Formula - correct answer C = Me % n

RSA Decryption Formula - correct answer P = Cd % n

EC Formula - correct answer y2 = x3 + Ax + B

Symmetric Decryption Formula - correct answer P = D(k,c)

Symmetric Encryption Formula - correct answer C = E(k,p)

Cipher disk invented by ___ in Year ____ - correct answer Leon Alberti - 1466

Vigenere Cipher invented by ____ in ____ Year - correct answer Giovan Battista
Bellaso - 1553