WGU C839 Flash Cards for OA QUESTIONS WITH CORRECT ANSWERS

WGU C839 Flash Cards for OA QUESTIONS WITH CORRECT ANSWERS DES (block/key/rounds) - CORRECT ANSWERS BLOCK SIZE - 64bit KEY SIZE - 56bit ROUNDS - 16 AES (block/key/rounds) - CORRECT ANSWERS BLOCK SIZE - 128bit KEY SIZE - 128, 192, or 256 ROUNDS - 10,12, or 14 Blowfish (block/key/rounds) - CORRECT ANSWERS BLOCK SIZE - 64bit KEY SIZE - 32-448 bit ROUNDS - 16 Twofish (block/key/rounds) - CORRECT ANSWERS BLOCK SIZE - 128bit KEY SIZE - 1-256bit ROUNDS - 16 Serpent (block/key/rounds) - CORRECT ANSWERS BLOCK SIZE - 128bit KEY SIZE - 128,192, or 256bit ROUNDS - 32 Skipjack (block/key/rounds) - CORRECT ANSWERS BLOCK SIZE - 64bit KEY SIZE - 80bit ROUNDS - 32 IDEA (block/key/rounds) - CORRECT ANSWERS BLOCK SIZE - 64bit KEY SIZE - 128bit ROUNDS - 8.5 COMMON SYMMETRIC STREAM CIPHERS RC4 - CORRECT ANSWERS 1-2048 bit key size COMMON SYMMETRIC STREAM CIPHERS FISH - CORRECT ANSWERS Uses Lagged Fibonacci pseudorandom number generator COMMON SYMMETRIC STREAM CIPHERS: PIKE - CORRECT ANSWERS Revised version of FISH to address known plaintext attack vulnerabilities COMMON ASYMMETRIC ENCRYPTION ALGORITHMS: RSA - CORRECT ANSWERS Factors the product of large prime numbers COMMON ASYMMETRIC ENCRYPTION ALGORITHMS: ECC - CORRECT ANSWERS Uses discrete logarithm characteristics Used in recent versions of PGP - CORRECT ANSWERS El Gamal SHA 1 hash key - CORRECT ANSWERS 160bit MD5 hash key - CORRECT ANSWERS 128bit SHA256 hash key - CORRECT ANSWERS 256bit FORK256 hash key - CORRECT ANSWERS 256bit RIPEMD-160 hash key - CORRECT ANSWERS 160bit GOST hash key - CORRECT ANSWERS 256bit TIGER hash key - CORRECT ANSWERS 192bit Key Exchange Algorithms - CORRECT ANSWERS Diffie Hellman (DH) Menezes-Qu-Vanstone (MQV) Key Exchange Algorithm (KEA) Elliptic Curve DH (ECDH) BLOCK CIPHER MODES: Electronic Code Book (ECB) - CORRECT ANSWERS Each block is encrypted independently, BUT identical plaintext blocks are encrypted in to identical ciphertext blocks. (least secure) BLOCK CIPHER MODES: Cipher Block Training (CBC) - CORRECT ANSWERS Each block of plaintext is XORed with the previous ciphertext block before being encrypted. To make blocks unique, an initialization vector must be used in the first block Cipher Feedback (CFB) - CORRECT ANSWERS Allows encryption of partial blocks rather than requiring full blocks for encryption. This eliminates the need to pad a block like in CBC. The Output Feedback (OFB) - CORRECT ANSWERS Makes a block cipher into a synchronous stream cipher. It generates keystream blocks, which are then XORed with the plaintext blocks to get the ciphertext.