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WGU Introduction-to-Cryptography Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Cryptography Fundamentals20%- Historical evolution and modern applications
- Basic terminology: plaintext, ciphertext, algorithm, key
- Core goals: confidentiality, integrity, authentication, non-repudiation
Topic 2: Key Management & Secure Protocols10%- Secure protocols: TLS/SSL, IPsec, SSH, PGP
- Key generation, storage, exchange, and destruction
- Cryptographic attacks: brute force, birthday, man-in-the-middle
Topic 3: Asymmetric Encryption & Public Key Infrastructure25%- Principles: public/private key pairs
- Certificate lifecycle: creation, validation, revocation
- PKI components: certificates, CAs, trust models
- Algorithms: RSA, ECC, Diffie-Hellman
- Digital signatures: purpose and process
Topic 4: Hash Functions & Data Integrity15%- Uses: integrity checks, password storage, message authentication
- HMAC construction and application
- Properties: collision resistance, one-way function
- Algorithms: SHA-1, SHA-256, SHA-3, MD5
Topic 5: Implementation & Best Practices5%- Common mistakes and vulnerabilities
- Standards and compliance
- Selecting appropriate algorithms and key sizes
Topic 6: Symmetric Encryption25%- Key generation, distribution, and management challenges
- Algorithms: AES, DES, 3DES, Blowfish
- Principles and operation
- Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB)

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WGU Introduction to Cryptography HNO1 Sample Questions (Q93-Q98):

NEW QUESTION # 93
(What is a focus of the ISO/IEC 27001 standard?)

Answer: C

Explanation:
ISO/IEC 27001 is an international standard for establishing, implementing, maintaining, and continually improving an Information Security Management System (ISMS). Its focus is not inventing cryptographic algorithms, but managing information security through a structured governance approach: identifying assets, assessing risks, selecting and implementing controls, measuring effectiveness, and continuously improving.
The standard emphasizes a risk-based methodology-controls are chosen based on organizational context and threat landscape, and the ISMS is refined over time through audits, management reviews, and corrective actions. While cryptography can be part of the control set (e.g., encryption policies, key management, secure communications), ISO/IEC 27001 addresses a broad range of security domains beyond crypto, including physical security, access control, incident management, supplier relationships, and business continuity. It also does not enforce criminal penalties; it is a certification/management standard. And it is not limited to network security. Therefore, the correct focus is risk management and continuous improvement of information security.


NEW QUESTION # 94
(What is used to randomize the initial value when generating Initialization Vectors (IVs)?)

Answer: D

Explanation:
An IV (Initialization Vector) is a value used to ensure that encrypting identical plaintext under the same key produces different ciphertexts, preventing pattern leakage. In many secure designs, the IV must be unique (and often unpredictable) per encryption operation. A common way to ensure uniqueness is to incorporate a nonce-a "number used once." A nonce can be random, pseudo-random, or a counter-based value depending on the mode and security requirements. For example, CTR mode uses a nonce combined with a counter to produce unique input blocks; GCM uses a nonce/IV to ensure unique authentication and encryption behavior. The encryption key should remain stable across many operations and should not be used as the "randomizer" for IV generation; mixing key material into IV creation in an ad hoc way can create reuse or correlation issues. Plaintext and algorithm do not provide the needed uniqueness property. The nonce concept is specifically about ensuring one-time uniqueness of the starting value so that IV reuse does not repeat keystream blocks (stream modes) or reveal plaintext equality (CBC/CTR). Therefore, the correct choice is Nonce.


NEW QUESTION # 95
(What are the roles of keys when using digital signatures?)

Answer: C


NEW QUESTION # 96
(What is a component of a one-time password (OTP) that is needed to guess future iterations of passwords?)

Answer: B

Explanation:
OTP systems (such as HOTP and TOTP) generate a sequence of passwords using a shared secret and a moving factor (counter or time). The critical secret that underpins the ability to compute past or future OTP values is the seed (also called the shared secret key). In HOTP, the seed is used with an HMAC function and an incrementing counter; in TOTP, the seed is used with HMAC and a time-step value. If an attacker obtains the seed and knows the algorithm and moving factor, they can compute future OTPs. The "function" and
"encryption algorithm" are typically standardized and public; security relies on keeping the seed secret. An initialization vector is not a standard OTP component in HOTP/TOTP generation. Therefore, the component needed to predict future OTP values is the seed. Protecting the seed is essential: it should be stored securely (e.
g., hardware token secure storage) and transmitted only through controlled provisioning processes. If compromised, OTP becomes predictable and no longer serves as a strong second factor.


NEW QUESTION # 97
(How does a Caesar cipher operate in the encryption of messages?)

Answer: C

Explanation:
A Caesar cipher is a classic monoalphabetic substitution cipher where each plaintext letter is replaced by a letter a fixed number of positions away in the alphabet. For example, with a shift of 3, A becomes D, B becomes E, and so on, wrapping around at the end (X#A, Y#B, Z#C). This "fixed shift" is the entire key: both sender and receiver must know the shift value to encrypt and decrypt. Decryption simply shifts letters back by the same amount. The Caesar cipher illustrates foundational cryptographic ideas: key-based transformation, reversible mapping, and the importance of key space size. Because the key space is tiny (only 25 meaningful shifts in the Latin alphabet), it is easily broken by brute force. It is also vulnerable to frequency analysis because letter frequency patterns in the ciphertext resemble those of the plaintext, just relabeled. While historically important for introducing substitution concepts, it provides no meaningful security by modern standards. The defining operation is the fixed positional shift, which directly matches option D.


NEW QUESTION # 98
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