WGU Introduction-to-Cryptography Dumps Full Questions - Exam Study Guide
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WGU Introduction to Cryptography HNO1 Sample Questions (Q92-Q97):
NEW QUESTION # 92
(How does Electronic Codebook (ECB) mode encryption function?)
Answer: C
Explanation:
ECB is the simplest block cipher mode: each plaintext block is encrypted independently using the same key and the block cipher primitive. There is no IV and no chaining, so identical plaintext blocks produce identical ciphertext blocks. This property leaks patterns and structure in the plaintext, which is why ECB is generally considered insecure for most real-world data beyond tiny, random-looking inputs. For example, images encrypted with ECB often reveal outlines because repeated pixel blocks map to repeated ciphertext blocks. Option A describes CTR mode, option C describes CBC mode, and option B resembles feedback-based modes. ECB's independence also means it can be parallelized, but the pattern leakage is a severe weakness. Modern practice prefers authenticated encryption modes (like GCM) or, at minimum, modes with IVs and chaining (like CBC with proper padding and MAC).
Therefore, the correct statement is that ECB encrypts each block with the same key and each block is independent of the others.
NEW QUESTION # 93
(Which mode of encryption converts data into a stream encryption and then uses a counter value and a nonce to encrypt the data?)
Answer: D
Explanation:
CTR (Counter) mode converts a block cipher into a stream-like encryption method by generating a keystream from encrypted counter blocks. The core idea is to construct a sequence of input blocks using a nonce (unique per message/session) plus an incrementing counter. Each nonce||counter block is encrypted with the block cipher under the shared key; the output is a pseudorandom block that is XORed with plaintext to produce ciphertext. Decryption repeats the same keystream generation and XORs with ciphertext to recover plaintext. CTR offers practical benefits: it is highly parallelizable, supports precomputation of keystream blocks, and allows random access to any block without needing previous blocks (unlike CBC). ECB and CBC are block modes that do not use nonce+counter keystream generation. CFB is a feedback mode that can behave stream-like, but it does not use the explicit counter/nonce construction characteristic of CTR. CTR's security hinges on never reusing the same nonce/counter sequence with the same key, because that would reuse the keystream and enable XOR-based plaintext recovery. Therefore, the correct mode is Counter (CTR).
NEW QUESTION # 94
(Which type of exploit involves looking for different inputs that generate the same hash?)
Answer: D
Explanation:
A birthday attack targets hash functions by exploiting the birthday paradox: collisions (two different inputs producing the same hash output) can be found much faster than brute-forcing a specific preimage. For an n-bit hash, the expected work t o find any collision is on the order of 2