Introduction-to-Cryptography Zertifizierungsfragen, WGU Introduction-to-Cryptography PrüfungFragen

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WGU Introduction-to-Cryptography Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Symmetric Encryption25%- Key generation, distribution, and management challenges
- Principles and operation
- Algorithms: AES, DES, 3DES, Blowfish
- Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB)
Topic 2: Key Management & Secure Protocols10%- Key generation, storage, exchange, and destruction
- Secure protocols: TLS/SSL, IPsec, SSH, PGP
- Cryptographic attacks: brute force, birthday, man-in-the-middle
Topic 3: Cryptography Fundamentals20%- Historical evolution and modern applications
- Basic terminology: plaintext, ciphertext, algorithm, key
- Core goals: confidentiality, integrity, authentication, non-repudiation
Topic 4: Hash Functions & Data Integrity15%- Uses: integrity checks, password storage, message authentication
- Properties: collision resistance, one-way function
- Algorithms: SHA-1, SHA-256, SHA-3, MD5
- HMAC construction and application
Topic 5: Asymmetric Encryption & Public Key Infrastructure25%- Principles: public/private key pairs
- Certificate lifecycle: creation, validation, revocation
- PKI components: certificates, CAs, trust models
- Digital signatures: purpose and process
- Algorithms: RSA, ECC, Diffie-Hellman
Topic 6: Implementation & Best Practices5%- Common mistakes and vulnerabilities
- Standards and compliance
- Selecting appropriate algorithms and key sizes

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WGU Introduction to Cryptography HNO1 Introduction-to-Cryptography Prüfungsfragen mit Lösungen (Q28-Q33):

28. Frage
(What is a focus of the ISO/IEC 27001 standard?)

Antwort: B

Begründung:
ISO/IEC 27001 is an international standard for establishing, implementing, maintaining, and continually improving an Information Security Management System (ISMS). Its focus is not inventing cryptographic algorithms, but managing information security through a structured governance approach: identifying assets, assessing risks, selecting and implementing controls, measuring effectiveness, and continuously improving.
The standard emphasizes a risk-based methodology-controls are chosen based on organizational context and threat landscape, and the ISMS is refined over time through audits, management reviews, and corrective actions. While cryptography can be part of the control set (e.g., encryption policies, key management, secure communications), ISO/IEC 27001 addresses a broad range of security domains beyond crypto, including physical security, access control, incident management, supplier relationships, and business continuity. It also does not enforce criminal penalties; it is a certification/management standard. And it is not limited to network security. Therefore, the correct focus is risk management and continuous improvement of information security.


29. Frage
(Employee A needs to send Employee B a symmetric key for confidential communication. Which key is used to encrypt the symmetric key?)

Antwort: C

Begründung:
When securely distributing a symmetric key over an untrusted network, a common approach is hybrid cryptography: use asymmetric cryptography to protect the symmetric key, then use the symmetric key for bulk encryption. To ensure only Employee B can recover the symmetric key, Employee A encrypts (wraps) that symmetric key using Employee B's public key. Because only Employee B should possess the matching private key, only B can decrypt the wrapped symmetric key. This is the same principle used in TLS key exchange (in older RSA key transport) and in secure email: encrypt the session key to the recipient's public key. Encrypting the symmetric key with Employee A's private key would not provide confidentiality-anyone with A's public key could reverse it, and it functions more like a signature than encryption. Employee B's private key should never be shared and is used only by B to decrypt. Therefore, for confidentiality of the shared symmetric key, the correct encryption key is Employee B's public key.


30. Frage
(Which number generator has different results given the same input data?)

Antwort: A

Begründung:
A true random number generator (TRNG) produces outputs derived from nondeterministic physical processes (e.g., thermal noise, oscillator jitter, radioactive decay, or other hardware entropy sources). Because the underlying phenomenon is not algorithmically determined by an input seed in the same way as a PRNG, repeated "inputs" (or identical conditions from a software perspective) do not yield the same sequence; the outputs vary unpredictably. By contrast, a pseudorandom number generator (PRNG) is deterministic: given the same seed and internal state, it produces the same output sequence, which is useful for repeatability but means security depends on seed secrecy and proper seeding. "Prime" is not a generator type, and "sequence" is too generic and does not imply nondeterminism. In cryptographic systems, TRNGs (or hardware entropy sources) are often used to seed cryptographically secure PRNGs (CSPRNGs), combining high-quality entropy with efficient generation. Therefore, the generator that can produce different results for the "same input data" is a true random number generator.


31. Frage
(Which certificate encoding process is binary-based?)

Antwort: D

Begründung:
DER (Distinguished Encoding Rules) is a binary encoding format used to represent ASN.1 structures in a canonical, unambiguous way. X.509 certificates are defined using ASN.1, and DER provides a strict subset of BER (Basic Encoding Rules) that guarantees a single, unique encoding for any given data structure. That "unique encoding" property is important for cryptographic operations such as hashing and digital signatures, because different encodings of the same abstract data could otherwise produce different hashes and break signature verification. In contrast, PEM is not a binary encoding; it is essentially a Base64-encoded text wrapper around DER data, bounded by header/footer lines (e.g.,
"BEGIN CERTIFICATE"). PKI is an overall framework for certificate issuance, trust, and lifecycle management-not an encoding. RSA is an asymmetric algorithm used for encryption/signing, not a certificate encoding format. Therefore, the binary-based certificate encoding process among the options is DER.


32. Frage
(A security analyst is using 3DES for data encryption. Which 3DES key size is valid?)

Antwort: A

Begründung:
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.


33. Frage
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