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WGU Introduction to Cryptography HNO1 Sample Questions:

1. (A security analyst uses a polyalphabetic substitution cipher with a keyword of YELLOW to encrypt a message. Which cipher should be used to encrypt the message?)

A) Vigenere
B) Caesar
C) Playfair
D) Pigpen

2. (What makes the RC4 cipher unique compared to RC5 and RC6?)

A) Stream
B) Symmetric
C) Block
D) Asymmetric

3. (Which default port must be allowed by firewalls for the key exchange of the IPsec handshaking process to be successful?)

A) UDP 500
B) UDP 443
C) TCP 500
D) TCP 443

4. (How does Electronic Codebook (ECB) mode encryption function?)

A) Converts from block to stream, then uses a counter value and a nonce to encrypt the data
B) Encrypts each block with the same key, where each block is independent of the others
C) Uses a self-synchronizing stream on the blocks, where the IV is encrypted and XORed with the data stream
D) Uses an IV to encrypt the first block, then uses the result to encrypt the next block

5. (What describes a true random number generator?)

A) Fast and deterministic, and the same input produces the same results
B) Integer increased by one to match requests and responses
C) Unique integer determined through factorization of integers
D) Slow and nondeterministic, and the same input produces different results

Solutions: