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WGU Introduction-to-Cryptography Exam Syllabus Topics:

Section	Weight	Objectives
Asymmetric Encryption & Public Key Infrastructure	25%	- Certificate lifecycle: creation, validation, revocation - Algorithms: RSA, ECC, Diffie-Hellman - PKI components: certificates, CAs, trust models - Principles: public/private key pairs - Digital signatures: purpose and process
Implementation & Best Practices	5%	- Common mistakes and vulnerabilities - Selecting appropriate algorithms and key sizes - Standards and compliance
Symmetric Encryption	25%	- Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Algorithms: AES, DES, 3DES, Blowfish - Key generation, distribution, and management challenges - Principles and operation
Key Management & Secure Protocols	10%	- Secure protocols: TLS/SSL, IPsec, SSH, PGP - Key generation, storage, exchange, and destruction - Cryptographic attacks: brute force, birthday, man-in-the-middle
Cryptography Fundamentals	20%	- Historical evolution and modern applications - Basic terminology: plaintext, ciphertext, algorithm, key - Core goals: confidentiality, integrity, authentication, non-repudiation
Hash Functions & Data Integrity	15%	- Uses: integrity checks, password storage, message authentication - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - Properties: collision resistance, one-way function - HMAC construction and application

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WGU Introduction to Cryptography HNO1 Sample Questions (Q65-Q70):

NEW QUESTION # 65
(Which cryptographic technique is used to ensure data integrity?)

A. Non-repudiation
B. Authentication
C. Digital signatures
D. Steganography

Answer: C

Explanation:
Data integrity means ensuring that information has not been modified without authorization. Digital signatures are a core cryptographic technique that provides integrity by binding a message (typically its hash) to the signer's private key. The signer creates a signature over the message digest; the verifier checks it with the signer's public key and recomputes the digest. Any change to the message alters the digest and causes verification to fail, revealing tampering. Digital signatures also support authenticity (verifying the signer) and can contribute to nonrepudiation under proper key-management and policy controls, but integrity is a primary guarantee they deliver. "Authentication" is broader and can be achieved by other means, but it is not as directly tied to integrity as signatures in this option set. "Non-repudiation" is an outcome/goal rather than a standalone integrity technique. "Steganography" hides the existence of data and does not inherently protect integrity. Therefore, among these options, digital signatures are the best cryptographic technique for ensuring data integrity.

NEW QUESTION # 66
(How is Public Key Infrastructure (PKI) commonly utilized in web browsers?)

A. To securely manage digital certificates and keys
B. To encrypt data at rest
C. To compress encrypted messages for storage
D. To authenticate users during data transmission

Answer: A

Explanation:
Web browsers rely on PKI to establish trust in secure connections, primarily through X.509 certificates and a built-in set of trusted root Certificate Authorities (CAs). When a browser connects to an HTTPS site, the server presents a certificate chain. The browser validates that chain up to a trusted root, checks that the certificate is valid for the domain (SAN/CN matching), confirms validity dates, and may check revocation status. This PKI process allows browsers to authenticate the website's identity and negotiate encrypted session keys for TLS, enabling confidentiality and integrity for the connection. In practical terms, the browser' s PKI components include certificate stores, validation logic, and mechanisms for handling intermediates, trust policies, and revocation. While PKI supports authentication as an outcome, the best description of how browsers utilize PKI is that they manage and validate digital certificates and associated keys to establish trust.
PKI is not about compressing messages or encrypting data at rest; it is about identity binding and trust chains that make secure web communication possible.

NEW QUESTION # 67
(Why should an asymmetric private key be used to encrypt the digest of an application?)

A. An asymmetric private key uses the same key to encrypt and decrypt large amounts of media, one bit at a time.
B. An asymmetric private key encrypts a small amount of information, which is decrypted with the corresponding private key.
C. An asymmetric private key signs files by signing (encrypting) the hash of a file so integrity and authenticity can be verified with the corresponding public key.
D. An asymmetric private key encrypts and decrypts data in blocks of characters at a time with a complex algorithm.

Answer: C

Explanation:
Digital signing of software typically works by hashing the application (or its manifest) and then using the publisher's private key to create a digital signature over that digest. The private key is used because it is secret and uniquely controlled by the publisher; only the publisher should be able to produce a valid signature. Verifiers (customers) use the publisher's public key to validate the signature and confirm that the digest matches the software they received. This yields two key properties: integrity (the software hasn't been altered; any modification changes the digest and breaks verification) and authenticity (the signature proves it came from the private-key holder). Option A incorrectly describes symmetric stream encryption. Option C incorrectly generalizes private-key behavior as "block encryption." Option D is wrong because verification uses the public key, not a private key; also,
"encrypting with private key" in this context is better understood as signing, not confidentiality encryption. Therefore, the correct rationale is that the asymmetric private key is used to sign the file's digest so the corresponding public key can verify integrity and authenticity.

NEW QUESTION # 68
(What is the length (in bits) of a SHA-1 hash output?)

A. 0
B. 1
C. 2
D. 3

Answer: D

Explanation:
SHA-1 (Secure Hash Algorithm 1) produces a fixed-size output of 160 bits (20 bytes). Hash output size matters in cryptography because it influences collision resistance and the effort required for various attacks.
For an ideal n-bit hash, finding a collision by generic means is expected around 2

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