WGU Introduction-to-Cryptography Zertifizierungsantworten & Introduction-to-Cryptography Prüfungsfrage

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WGU Introduction-to-Cryptography Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Hash Functions & Data Integrity	15%	- Algorithms: SHA-1, SHA-256, SHA-3, MD5 - HMAC construction and application - Properties: collision resistance, one-way function - Uses: integrity checks, password storage, message authentication
Topic 2: Implementation & Best Practices	5%	- Standards and compliance - Common mistakes and vulnerabilities - Selecting appropriate algorithms and key sizes
Topic 3: Asymmetric Encryption & Public Key Infrastructure	25%	- PKI components: certificates, CAs, trust models - Certificate lifecycle: creation, validation, revocation - Algorithms: RSA, ECC, Diffie-Hellman - Principles: public/private key pairs - Digital signatures: purpose and process
Topic 4: 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
Topic 5: Symmetric Encryption	25%	- Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Principles and operation - Algorithms: AES, DES, 3DES, Blowfish - Key generation, distribution, and management challenges
Topic 6: Cryptography Fundamentals	20%	- Historical evolution and modern applications - Core goals: confidentiality, integrity, authentication, non-repudiation - Basic terminology: plaintext, ciphertext, algorithm, key

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WGU Introduction to Cryptography HNO1 Introduction-to-Cryptography Prüfungsfragen mit Lösungen (Q60-Q65):

60. Frage
(A company wants to use certificates issued by a root CA to demonstrate to customers that it is a legitimate company being hosted by a cloud provider. Who needs to trust the root CA public key?)

A. The seller and the buyer
B. The Federal Trade Commission and the cloud provider
C. The cloud provider and the seller
D. The buyer and the Federal Trade Commission

Antwort: A

61. Frage
(How does a Caesar cipher operate in the encryption of messages?)

A. Shifting each letter in the alphabet by a fixed number
B. Reversing the order of letters in a message
C. Encrypting messages using complex mathematical algorithms
D. Substitution of letters with their numerical equivalents

Antwort: A

Begründung:
A Caesar cipher is a classic monoalphabetic substitution cipher where each plaintext letter is replaced by a letter a fixed number of positions away in the alphabet. For example, with a shift of 3, A becomes D, B becomes E, and so on, wrapping around at the end (X#A, Y#B, Z#C). This "fixed shift" is the entire key: both sender and receiver must know the shift value to encrypt and decrypt. Decryption simply shifts letters back by the same amount. The Caesar cipher illustrates foundational cryptographic ideas: key-based transformation, reversible mapping, and the importance of key space size. Because the key space is tiny (only 25 meaningful shifts in the Latin alphabet), it is easily broken by brute force. It is also vulnerable to frequency analysis because letter frequency patterns in the ciphertext resemble those of the plaintext, just relabeled. While historically important for introducing substitution concepts, it provides no meaningful security by modern standards. The defining operation is the fixed positional shift, which directly matches option D.

62. Frage
(What is the maximum key size (in bits) supported by AES?)

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

Antwort: B

Begründung:
AES supports three standardized key sizes: 128, 192, and 256 bits, with a fixed block size of 128 bits.
The maximum of these supported key sizes is 256 bits (AES-256). Key size affects resistance to brute- force key search: larger keys exponentially increase the search space. In practice, AES-128 is already considered strong against brute force with contemporary computing capabilities, while AES-256 is often chosen for compliance requirements, conservative security margins, or to hedge against future advances. AES-512 is not part of the AES standard; if 512-bit keys are desired, systems typically use different constructions (like using AES-256 in certain key-derivation or wrapping schemes) rather than changing AES itself. Therefore, the correct maximum supported AES key size is 256 bits.

63. Frage
(A security analyst uses a polyalphabetic substitution cipher with a keyword of YELLOW to encrypt a message. Which cipher should be used to encrypt the message?)

A. Caesar
B. Pigpen
C. Vigenere
D. Playfair

Antwort: C

Begründung:
A polyalphabetic substitution cipher uses multiple substitution alphabets rather than a single fixed mapping. The classic cipher that uses a keyword to select shifting alphabets across the message is the Vigenere cipher. In Vigenere, each plaintext letter is shifted by an amount determined by the corresponding key letter (repeating the keyword as needed). For example, a keyword like "YELLOW" is aligned under the plaintext; each key character defines a Caesar shift (A=0, B=1, ...) applied to the plaintext character, producing ciphertext. This rotation of alphabets across positions makes Vigenere more resistant to simple frequency analysis than monoalphabetic substitution, because the same plaintext letter may encrypt to different ciphertext letters depending on its position relative to the key.
The Pigpen cipher is a symbol substitution cipher, Caesar is monoalphabetic with a single shift, and Playfair is a digraph substitution cipher using a 5×5 key square, not the repeating-key polyalphabetic method described. Therefore, the correct cipher is Vigenere.

64. Frage
(Which mode of encryption converts data into a stream encryption and then uses a counter value and a nonce to encrypt the data?)

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

Antwort: D

Begründung:
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).

65. Frage
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