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WGU Introduction-to-Cryptography Exam Syllabus Topics:

SectionObjectives
Topic 1: Cryptanalysis and Attacks- Brute Force and Dictionary Attacks
- Social Engineering Prevention
- Common Attack Vectors
Topic 2: Asymmetric Cryptography- Public Key Infrastructure (PKI)
- RSA Algorithm
- Diffie-Hellman Key Exchange
- Elliptic Curve Cryptography (ECC)
Topic 3: Cryptography Fundamentals- History and Evolution of Cryptography
- Cryptographic Terminology
- Symmetric vs Asymmetric Encryption
Topic 4: Applied Cryptography- PGP and Email Encryption
- VPN Security
- SSL/TLS Protocols
- Cryptographic Best Practices
Topic 5: Symmetric Cryptography- Block Ciphers (AES, DES, 3DES)
- Key Management
- Initialization Vectors (IV)
- Stream Ciphers
Topic 6: Hashing and Digital Signatures- Hash Functions (MD5, SHA-1, SHA-256)
- Digital Signature Standards
- Message Authentication Codes (MAC)

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WGU Introduction to Cryptography HNO1 Sample Questions (Q46-Q51):

NEW QUESTION # 46
(A security engineer is implementing device authentication as a form of two-factor authentication in a Public Key Infrastructure (PKI) environment. What should be used as a second form of authentication?)

Answer: B

Explanation:
In a PKI environment, a digital certificate is the standard credential used to bind an identity (user, device, service) to a public key, with that binding vouched for by a Certificate Authority. For device authentication, the device typically proves possession of the private key corresponding to the certificate' s public key (for example, during a TLS handshake). As a second factor in a two-factor model, a certificate (often stored in a TPM, smart card, or secure enclave) represents "something you have"-a cryptographic credential anchored to hardware or a managed endpoint. The other listed options (symmetric encryption, asymmetric encryption, digital signature) are cryptographic operations or algorithm classes, not stand-alone authentication factors. A digital signature is a mechanism used within authentication flows, but it is not itself the credential that establishes an enrolled device identity within PKI. In practice, a certificate-based device factor is commonly paired with a knowledge factor (password/PIN) or a biometric factor to achieve true 2FA, but among these choices, the appropriate second form of authentication in PKI terms is the digital certificate.


NEW QUESTION # 47
(What are the roles of keys when using digital signatures?)

Answer: D


NEW QUESTION # 48
(What is the correlation between the number of rounds and the key length used in the AES algorithm?)

Answer: D

Explanation:
In AES, the number of rounds is explicitly tied to the key length. AES-128 uses 10 rounds, AES-192 uses 12 rounds, and AES-256 uses 14 rounds. The purpose of additional rounds is to increase diffusion and confusion, strengthening resistance against cryptanalysis as the key schedule and state transformations iterate more times. Although key length primarily affects brute-force resistance, AES's designers and standardization parameters link longer keys with more rounds to maintain security margins across variants, especially considering differences in the key schedule structure. Thus, as key length increases from 128 to 192 to 256 bits, the number of rounds increases correspondingly from 10 to 12 to 14. This relationship is fixed by the AES specification and does not vary dynamically at runtime. Therefore, the correct correlation is that the number of rounds increases as the key length increases.


NEW QUESTION # 49
(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 # 50
(What are the primary characteristics of Bitcoin proof of work?)

Answer: A

Explanation:
Bitcoin's proof of work (PoW) is designed so that finding a valid block is computationally difficult, but checking validity is computationally easy. Miners must repeatedly hash candidate block headers (double SHA-
256) with different nonces until they find a hash value below a network-defined target. This trial-and-error search requires significant work and energy because the probability of success per attempt is extremely low at current difficulty levels. However, verification is straightforward: any node can hash the block header once (or a small number of times) and confirm the resulting hash meets the target threshold and that the block contents follow protocol rules. This "hard to produce, easy to verify" property is essential: it makes it expensive for attackers to rewrite history or outpace honest miners, while allowing all participants-even low- power devices-to validate blocks efficiently. Therefore, the primary characteristic of Bitcoin proof of work is that it is difficult to produce and easy to verify.


NEW QUESTION # 51
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