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Introduction-to-Cryptography New Test Materials, Introduction-to-Cryptography Dumps Vce

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WGU Introduction to Cryptography HNO1 Sample Questions (Q73-Q78):

NEW QUESTION # 73
(Which lesson can be learned from organizations that experience breaches due to poor cryptographic practices?)

• A. Comprehensive risk assessments are vital for identifying potential vulnerabilities.
• B. Security measures should be secondary to business objectives.
• C. Regular audits and updates are unnecessary.
• D. Employee training is not relevant for preventing breaches.

Answer: A

Explanation:
Breaches tied to poor cryptographic practices often stem from preventable issues: outdated algorithms, weak key management, misconfigured TLS, missing integrity checks, hard-coded secrets, unrotated keys, or improper certificate validation. A key lesson is that organizations must proactively identify and prioritize these risks-exactly what comprehensive risk assessments are designed to do. Effective risk assessment inventories cryptographic assets (keys, certificates, protocols), maps them to business processes, evaluates threats (e.g., MITM, data exfiltration, supply-chain tampering), and finds gaps between current controls and best practices. It also helps ensure crypto decisions align with real-world risk, compliance requirements, and operational constraints. The other options are explicitly wrong: training is relevant because many crypto failures are implementation/configuration errors; audits and updates are essential because cryptographic guidance evolves; and security cannot be "secondary" without increasing breach likelihood and impact.
Therefore, the most defensible lesson is that comprehensive risk assessments are vital for identifying vulnerabilities before attackers exploit them.

NEW QUESTION # 74
(Which additional input element can be used to implement integrity in combination with symmetric ciphers?)

• A. Encoding algorithm
• B. Initialization vector
• C. Nonce value
• D. Hash function

Answer: D

Explanation:
Symmetric encryption alone typically provides confidentiality, but it does not automatically provide integrity. Many encryption modes (especially older ones like CBC without authentication) are malleable, meaning an attacker may be able to modify ciphertext and cause predictable changes in plaintext after decryption. To add integrity, systems commonly combine symmetric encryption with a cryptographic hash-based integrity mechanism, such as a hash function used in an HMAC (Hash-based Message Authentication Code) or a dedicated authenticated-encryption mode like GCM that internally uses authentication tags. Among the given options, a hash function is the fundamental additional element that enables integrity checks: it allows construction of a MAC (e.g., HMAC-SHA-256) that the receiver verifies to detect any tampering. An initialization vector and a nonce value are used to ensure uniqueness and randomness properties for encryption but do not, by themselves, guarantee integrity.
An encoding algorithm changes representation, not security. Therefore, the correct additional input element for implementing integrity alongside symmetric encryption is a hash function, typically as part of an HMAC or similar MAC construction.

NEW QUESTION # 75
(Which component is used to verify the integrity of a message?)

• A. TKIP
• B. IV
• C. AES
• D. HMAC

Answer: D

Explanation:
HMAC (Hash-based Message Authentication Code) is a standard mechanism used to verify both integrity and authenticity of a message when two parties share a secret key. It combines a cryptographic hash function (such as SHA-256) with a secret key in a structured way that resists common attacks on naive keyed-hash constructions. The sender computes an HMAC tag over the message and transmits the message plus tag. The receiver recomputes the HMAC using the same shared secret key and compares the result; if the tag matches, the receiver can be confident the message was not modified in transit and that it came from someone who knows the shared key. AES is an encryption algorithm primarily providing confidentiality; it can provide integrity only when used in authenticated modes (e.g., GCM) but "AES" alone is not the integrity component. An IV helps randomize encryption but does not validate integrity. TKIP is a legacy WLAN protocol component, not the general integrity verifier. Therefore, the correct component for verifying message integrity among the options is HMAC.

NEW QUESTION # 76
(What is a characteristic of Cipher Block Chaining (CBC) mode in cryptography?)

• A. It requires a different key for each encryption operation.
• B. It encrypts each block of plaintext dependent on the previous block.
• C. It operates on 32-bit blocks.
• D. It generates a continuous stream of key material.

Answer: B

Explanation:
CBC mode introduces chaining between blocks to prevent the pattern leakage inherent in ECB. In CBC, each plaintext block is XORed with the previous ciphertext block before being encrypted with the block cipher. For the first block, CBC uses an Initialization Vector (IV) to serve as the "previous ciphertext" input. This makes encryption of each block dependent on the previous block's ciphertext, which is exactly the defining characteristic described in option A. CBC does not generate a continuous stream of key material-that describes stream ciphers or stream-like modes such as CTR/OFB. CBC also does not require a different key per operation; the same symmetric key is reused, while the IV must be fresh/unpredictable to ensure semantic security. The block size is determined by the underlying block cipher (e.g., AES is 128-bit blocks, DES/3DES are 64-bit blocks), not a fixed 32-bit size for CBC itself. Because CBC is not inherently authenticated, best practice is to pair it with a MAC (Encrypt-then-MAC) or use an AEAD mode instead.

NEW QUESTION # 77
(Quantum computing poses a threat to which cryptographic algorithm?)

• A. Electronic Codebook (ECB)
• B. Secure Hash Algorithm 256 (SHA-256)
• C. Advanced Encryption Standard (AES)
• D. Rivest-Shamir-Adleman (RSA)

Answer: D

Explanation:
Large-scale quantum computers threaten many widely deployed public-key algorithms because quantum algorithms can solve their underlying hard math problems efficiently. In particular, Shor's algorithm can factor large integers and compute discrete logarithms in polynomial time, which directly breaks the security assumptions of RSA (factoring) and traditional Diffie-Hellman/ECC (discrete log). That makes RSA the clearest target among the options. By comparison, symmetric algorithms like AES are affected mainly by Grover's algorithm, which provides a quadratic speedup for brute force; this can be mitigated by using larger keys (e.g., AES-256). Hash functions like SHA-256 also face Grover-style speedups for preimage search, again mitigated by output length/security margin, and collision resistance is impacted differently. ECB is a mode of operation, not a standalone algorithm, and its issues are classical (pattern leakage), not specifically quantum. Therefore, the algorithm most directly threatened by quantum computing among the choices is RSA.

NEW QUESTION # 78
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