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WGU Introduction-to-Cryptography Exam Syllabus Topics:

Section	Weight	Objectives
Hash Functions & Data Integrity	15%	- Properties: collision resistance, one-way function - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - Uses: integrity checks, password storage, message authentication - HMAC construction and application
Key Management & Secure Protocols	10%	- Key generation, storage, exchange, and destruction - Cryptographic attacks: brute force, birthday, man-in-the-middle - Secure protocols: TLS/SSL, IPsec, SSH, PGP
Cryptography Fundamentals	20%	- Historical evolution and modern applications - Basic terminology: plaintext, ciphertext, algorithm, key - Core goals: confidentiality, integrity, authentication, non-repudiation
Implementation & Best Practices	5%	- Selecting appropriate algorithms and key sizes - Standards and compliance - Common mistakes and vulnerabilities
Symmetric Encryption	25%	- Key generation, distribution, and management challenges - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Principles and operation - Algorithms: AES, DES, 3DES, Blowfish
Asymmetric Encryption & Public Key Infrastructure	25%	- Certificate lifecycle: creation, validation, revocation - Algorithms: RSA, ECC, Diffie-Hellman - Digital signatures: purpose and process - PKI components: certificates, CAs, trust models - Principles: public/private key pairs

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WGU Introduction to Cryptography HNO1 Sample Questions (Q21-Q26):

NEW QUESTION # 21
(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. Uses a self-synchronizing stream on the blocks, where the IV is encrypted and XORed with the data stream
C. Uses an IV to encrypt the first block, then uses the result to encrypt the next block
D. Encrypts each block with the same key, where each block is independent of the others

Answer: D

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 # 22
(What is the length (in bits) of a SHA-1 hash output?)

A. 0
B. 1
C. 2
D. 3

Answer: C

Explanation:
SHA-1 (Secure Hash Algorithm 1) produces a fixed-size output of 160 bits (20 bytes). Hash output size matters in cryptography because it influences collision resistance and the effort required for various attacks. For an ideal n-bit hash, finding a collision by generic means is expected around 2

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