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WGU Introduction to Cryptography HNO1 Sample Questions:

1. (Which mode of encryption uses an Initialization Vector (IV) to encrypt the first block and then uses the result to encrypt the next block?)

A) Cipher Feedback (CFB)
B) Output Feedback (OFB)
C) Electronic Codebook (ECB)
D) Cipher Block Chaining (CBC)

2. (What describes how Counter (CTR) mode encryption functions?)

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

3. (A security analyst is using 3DES for data encryption. Which 3DES key size is valid?)

A) 112-bit
B) 2,048-bit
C) 56-bit
D) 128-bit

4. (Which symmetric encryption technique uses a 112-bit key size and a 64-bit block size?)

A) AES
B) 3DES
C) IDEA
D) DES

5. (What is the maximum key size (in bits) supported by AES?)

A) 256
B) 512
C) 192
D) 128

Solutions: