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| Section | Objectives |
|---|---|
| Key Management and PKI | - Certificates, certificate authorities, and PKI structure - Key exchange and lifecycle management |
| Foundations of Cryptography | - Core concepts of confidentiality, integrity, authentication, non-repudiation - Historical and modern cryptography principles |
| Cryptographic Protocols and Applications | - TLS/SSL conceptual overview - Secure communication design principles |
| Hash Functions and Message Authentication | - MAC and HMAC mechanisms - Cryptographic hash functions (e.g., SHA family concepts) |
| Asymmetric Encryption | - Public key cryptography principles - RSA and ECC fundamentals |
| Symmetric Encryption | - AES and legacy algorithms (e.g., DES conceptually) - Block and stream ciphers |
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The study material to get WGU Introduction to Cryptography HNO1 should be according to individual's learning style and experience. Real WGU Introduction-to-Cryptography Exam Questions certification makes you more dedicated and professional as it will provide you complete information required to work within a professional working environment. These questions will familiarize you with the Introduction-to-Cryptography Exam Format and the content that will be covered in the actual test. You will not get a passing score if you rely on outdated practice questions.
NEW QUESTION # 76
(How can auditing enhance an organization ' s cryptographic practices?)
Answer: D
NEW QUESTION # 77
(An organization wants to digitally sign its software to guarantee the integrity of its source code. Which key should the customer use to decrypt the digest of the source code?)
Answer: D
Explanation:
When software is digitally signed, the organization computes a cryptographic hash (digest) of the software (or its manifest) and then signs that digest using the organization's private key. Verification works in the opposite direction: the customer (verifier) uses the organization's public key to validate the signature and recover/confirm the signed digest, then independently hashes the received software and compares the result. If the digests match and the signature validates under the public key, the customer has strong assurance that the software has not been altered since it was signed and that it was signed by the holder of the corresponding private key. The customer never needs the organization's private key-sharing it would destroy security and enable forgery. Likewise, the customer's own keys are irrelevant to verifying the publisher's signature. The organization's public key is typically delivered inside a certificate chain (code signing certificate) so the verifier can also validate publisher identity and trust. Therefore, the customer uses the organization's public key for signature verification (often described as "decrypting" the signed digest).
NEW QUESTION # 78
(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 # 79
(Which cipher uses shifting letters of the alphabet for encryption?)
Answer: A
Explanation:
The Caesar cipher is the classic substitution cipher that encrypts by shifting letters of the alphabet by a fixed number of positions (e.g., shift by 3: A#D, B#E, etc.). It is a monoalphabetic cipher because a single shift value is applied uniformly across the entire message, making it simple and vulnerable to frequency analysis and brute force (only 25 meaningful shifts in the Latin alphabet). Vigenere also involves shifting, but it uses a repeating keyword to vary the shift per character (polyalphabetic), whereas the question's phrasing typically points to the fundamental "shift cipher," which is Caesar.
SHA-1 is a cryptographic hash function, not a cipher. Bifid is a fractionation cipher combining Polybius square coordinates and transposition, not a direct shifting method. Therefore, the cipher that uses shifting letters of the alphabet for encryption is the Caesar cipher.
NEW QUESTION # 80
(Why did the National Institute of Standards and Technology (NIST) choose Ascon for lightweight cryptography?)
Answer: C
Explanation:
NIST's lightweight cryptography effort targets environments like IoT and embedded systems where CPU, memory, energy, and bandwidth are constrained, yet strong security is still required. Ascon is an authenticated encryption with associated data (AEAD) family designed to be efficient in both hardware and software with small footprint, making it well-suited for constrained devices. NIST selected Ascon because it offers a strong security design with good performance and implementability under tight resource budgets, while providing modern protections (confidentiality + integrity) through AEAD. That aligns with option C: secure and efficient encryption for resource-constrained devices. The selection was not primarily about authenticating users (that is typically handled by protocols and identity systems, not an AEAD primitive). It was also not mainly about legacy compatibility; lightweight cryptography aims at new and constrained deployments rather than preserving outdated stacks. And while Ascon can certainly be used to protect data at rest, that is only one application; the core reason for the choice is its suitability for constrained environments and robust, efficient authenticated encryption.
NEW QUESTION # 81
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