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WGU Introduction-to-Cryptography Exam Syllabus Topics:

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WGU Introduction to Cryptography HNO1 Sample Questions (Q44-Q49):

NEW QUESTION # 44
(Which is an example of asymmetric encryption?)

• A. Hash-based Message Authentication Code (HMAC)
• B. Data Encryption Standard (DES)
• C. Secure Hash Algorithm 256 (SHA-256)
• D. Elliptic-Curve Cryptography (ECC)

Answer: D

Explanation:
Asymmetric cryptography uses a public/private key pair where different keys are used for related operations (encryption/decryption or signature/verification). Elliptic-Curve Cryptography (ECC) is a family of asymmetric algorithms built on the mathematics of elliptic curves over finite fields. ECC supports key exchange (ECDH), digital signatures (ECDSA/EdDSA), and other primitives with smaller key sizes for comparable security to traditional discrete-log or RSA systems (e.g., a 256-bit ECC key is often comparable in security to a 3072-bit RSA key, depending on scheme and parameters). By contrast, SHA-256 is a cryptographic hash function (one-way digest), and HMAC is a keyed integrity/authentication construction built from a hash function-neither is encryption. DES is a symmetric block cipher (same key for encryption and decryption). Therefore, the example of asymmetric encryption among the options is ECC.

NEW QUESTION # 45
(Which additional input element can be used to implement integrity in combination with symmetric ciphers?)

• A. Nonce value
• B. Encoding algorithm
• C. Initialization vector
• 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 # 46
(What is the Enigma machine known for in the history of cryptography?)

• A. A type of cryptographic algorithm
• B. A device used for secure communication during World War II
• C. A software program for encrypting emails
• D. A method for decrypting messages

Answer: B

Explanation:
The Enigma machine is historically known as an electro-mechanical cipher device used primarily by Nazi Germany to secure military and diplomatic communications during World War II. It implemented a polyalphabetic substitution through a system of rotors, a reflector, and a plugboard, producing a large number of possible daily key settings. Operators would configure rotor order, ring settings, initial positions, and plugboard swaps, then type messages to generate ciphertext. Enigma's operational security depended heavily on correct procedures and secrecy of keys; weaknesses in procedures and design properties, combined with brilliant cryptanalysis and engineering efforts by Allied codebreakers (notably at Bletchley Park), enabled large-scale decryption of Enigma-encrypted traffic. In cryptography history, Enigma represents the transition from manual ciphers to machine-assisted encryption and demonstrates how both mathematics and operational practices determine real-world security. It is not simply an "algorithm" in the modern software sense, and it is not a decryption method or email encryption tool. Therefore, the correct description is that it was a device used for secure communication during WWII.

NEW QUESTION # 47
(Why should a forensic investigator create a hash of a victim's hard drive and of the bitstream copy of the hard drive?)

• A. To verify that the drives are identical
• B. To establish who created the files on the drives
• C. To certify the information on the drive is correct
• D. To identify if someone opened the drive

Answer: A

Explanation:
In digital forensics, investigators must preserve evidence integrity and demonstrate an unbroken chain of custody. Creating a cryptographic hash (such as SHA-256) of the original drive and then hashing the forensic bitstream image provides a strong mathematical assurance that the copy is an exact, bit-for-bit replica. Because secure hash functions are designed so that any tiny change in data produces a dramatically different digest, matching hashes indicate the image contains identical data to the source at the time of acquisition. This is critical in legal and investigative contexts: analysis is performed on the copy, not the original, to avoid altering evidence. If the hashes match, the investigator can testify that the evidence examined is identical to what was collected, supporting admissibility and credibility.
Hashing does not prove who created files, nor does it directly show whether someone "opened the drive"; it specifically validates the integrity and equivalence of the captured image. Therefore, hashing both artifacts is done to verify that the original and the bitstream copy are identical.

NEW QUESTION # 48
(Which cryptographic operation uses a single key?)

• A. Padding
• B. Hashing
• C. Symmetric
• D. Asymmetric

Answer: C

Explanation:
Symmetric cryptography uses a single shared secret key for both encryption and decryption. This contrasts with asymmetric cryptography, which uses a key pair (public/private). Symmetric algorithms (like AES, ChaCha20) are efficient and well-suited for bulk data encryption, but they require a secure method for key distribution because both parties must possess the same secret. Hashing is not a keyed operation by default (though HMAC is keyed); it maps arbitrary data to a fixed-size digest and is primarily used for integrity checking, fingerprints, and password hashing constructions. Padding is a data formatting technique (e.g., PKCS#7) used to align plaintext to a block size; it is not a cryptographic "operation" that uses a key.
Therefore, the cryptographic operation characterized by using one key shared between parties is symmetric encryption. In real systems, symmetric encryption is frequently combined with asymmetric methods for key exchange and with MACs/AEAD for integrity, producing the standard hybrid approach used in protocols like TLS and IPsec.

NEW QUESTION # 49
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