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WGU Introduction to Cryptography HNO1 Sample Questions (Q35-Q40):

NEW QUESTION # 35
(What does nonrepudiation aim to achieve in the context of cryptography?)

• A. Holding parties accountable for their actions and transactions
• B. Verifying the identity of the sender in secure communication
• C. Preventing unauthorized access to sensitive data
• D. Ensuring the confidentiality of encrypted messages

Answer: A

Explanation:
Nonrepudiation aims to prevent a party from later denying having performed an action, such as sending a message, approving a transaction, or signing a document. In cryptographic systems, nonrepudiation is typically supported by digital signatures, audit logs, and trusted time-stamping: if a message is signed with a private key and verified with the corresponding public key (often bound to an identity via a certificate), the signer can be held accountable for that signed content. This creates evidence that can be used for dispute resolution, compliance, and legal or contractual enforcement. Nonrepudiation is distinct from confidentiality (keeping data secret) and from access control (preventing unauthorized use). While authentication (verifying identity) is related and often a prerequisite, the defining goal is accountability-ensuring that actions can be attributed to entities in a way that is difficult to dispute later. Effective nonrepudiation also depends on secure private key management, certificate validation, and procedures that show the key was under the signer's control at the time. Therefore, the correct answer is holding parties accountable for their actions and transactions.

NEW QUESTION # 36
(A Linux user password is identified as follows:
$2a$08$AbCh0RCM8p8FGaYvRLI0H.Kng54gcnWCOQYIhas708UEZRQQjGBh4
Which hash algorithm should be used to salt this password?)

• A. SHA-512
• B. NTLM
• C. bcrypt
• D. MD5

Answer: C

Explanation:
The string format $2a$08$... is a well-known identifier for the bcrypt password hashing scheme. In common password-hash notation, the prefix indicates the algorithm and parameters: "$2a$" denotes bcrypt (version 2a), and "08" indicates the cost factor (work factor) controlling how computationally expensive hashing is. bcrypt is designed specifically for password storage: it includes a built-in salt and is intentionally slow and adaptive, making brute-force and GPU attacks far more expensive than fast general-purpose hashes like MD5 or SHA-512. NTLM and MD5 are obsolete for secure password storage due to speed and known weaknesses. SHA-512, while cryptographically strong as a hash, is still too fast for password hashing unless used in a dedicated password-hashing construction (e.g., PBKDF2, scrypt, Argon2) with appropriate parameters and salts. Since the given hash clearly matches bcrypt's encoding, the correct algorithm is bcrypt, which incorporates salting and cost-based key stretching as part of its design.

NEW QUESTION # 37
(What is the purpose of code-signing in current systems?)

• A. To generate random numbers for encryption
• B. To verify the integrity and authenticity of software
• C. To compress data for efficient storage
• D. To authenticate users during data transmission

Answer: B

Explanation:
Code-signing is used to provide verifiable assurance that software comes from a known publisher and has not been modified since it was signed. In a typical code-signing workflow, the publisher computes a cryptographic hash (digest) of the executable or package and then creates a digital signature over that digest using the publisher's private key. Operating systems, browsers, and application platforms verify the signature using the corresponding public key (usually delivered via a code-signing certificate chained to a trusted root).
If verification succeeds, the system can trust that the code's contents match what the publisher signed (integrity) and that the signer identity is authenticated by the certificate chain (authenticity). This helps defend against tampering, malware injection, and supply-chain attacks where attackers alter binaries or updates in transit or at rest. Code-signing does not primarily generate randomness, compress data, or authenticate users; it authenticates the software publisher and validates the software artifact. Modern ecosystems also use timestamping and revocation checking to handle certificate expiration and compromised signing keys, reinforcing trust over time.

NEW QUESTION # 38
(A security analyst is using 3DES for data encryption. Which 3DES key size is valid?)

• A. 128-bit
• B. 112-bit
• C. 56-bit
• D. 2,048-bit

Answer: B

Explanation:
3DES (Triple DES) applies the DES block cipher three times to increase effective security, and its commonly cited valid key sizes correspond to how many independent DES keys are used. Two-key 3DES uses two 56- bit DES keys (K1 and K2) in an EDE sequence (Encrypt with K1, Decrypt with K2, Encrypt with K1), yielding 112 bits of keying material (ignoring parity bits). Three-key 3DES uses three independent 56-bit keys for a total of 168 bits of keying material, but that option is not listed here. A 56-bit key corresponds to single DES, not 3DES. 128-bit is associated with AES, not 3DES. 2,048-bit is typical for RSA keys, not symmetric ciphers. Therefore, among the choices provided, 112-bit is a valid 3DES key size. While 3DES is now deprecated for many uses due to its 64-bit block size and performance limitations, understanding its keying options remains important for legacy system assessment.

NEW QUESTION # 39
(Which mode of encryption converts data into a stream encryption and then uses a counter value and a nonce to encrypt the data?)

• A. Counter (CTR)
• B. Cipher Feedback (CFB)
• C. Electronic Codebook (ECB)
• D. Cipher Block Chaining (CBC)

Answer: A

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 # 40
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