Introduction-to-Cryptography Studienmaterialien: WGU Introduction to Cryptography HNO1 - Introduction-to-Cryptography Torrent Prüfung & Introduction-to-Cryptography wirkliche Prüfung

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WGU Introduction-to-Cryptography Exam Syllabus Topics:

Section	Objectives
Topic 1: Applied Cryptography	- VPN Security - Cryptographic Best Practices - PGP and Email Encryption - SSL/TLS Protocols
Topic 2: Symmetric Cryptography	- Key Management - Stream Ciphers - Block Ciphers (AES, DES, 3DES) - Initialization Vectors (IV)
Topic 3: Hashing and Digital Signatures	- Digital Signature Standards - Hash Functions (MD5, SHA-1, SHA-256) - Message Authentication Codes (MAC)
Topic 4: Cryptanalysis and Attacks	- Social Engineering Prevention - Brute Force and Dictionary Attacks - Common Attack Vectors
Topic 5: Cryptography Fundamentals	- Cryptographic Terminology - History and Evolution of Cryptography - Symmetric vs Asymmetric Encryption
Topic 6: Asymmetric Cryptography	- RSA Algorithm - Public Key Infrastructure (PKI) - Diffie-Hellman Key Exchange - Elliptic Curve Cryptography (ECC)

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Introduction-to-Cryptography Exam, Introduction-to-Cryptography Prüfungsvorbereitung

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WGU Introduction to Cryptography HNO1 Introduction-to-Cryptography Prüfungsfragen mit Lösungen (Q69-Q74):

69. Frage
(What is a component of a one-time password (OTP) that is needed to guess future iterations of passwords?)

A. Seed
B. Function
C. Encryption algorithm
D. Initialization vector

Antwort: A

Begründung:
OTP systems (such as HOTP and TOTP) generate a sequence of passwords using a shared secret and a moving factor (counter or time). The critical secret that underpins the ability to compute past or future OTP values is the seed (also called the shared secret key). In HOTP, the seed is used with an HMAC function and an incrementing counter; in TOTP, the seed is used with HMAC and a time-step value. If an attacker obtains the seed and knows the algorithm and moving factor, they can compute future OTPs. The "function" and
"encryption algorithm" are typically standardized and public; security relies on keeping the seed secret. An initialization vector is not a standard OTP component in HOTP/TOTP generation. Therefore, the component needed to predict future OTP values is the seed. Protecting the seed is essential: it should be stored securely (e.
g., hardware token secure storage) and transmitted only through controlled provisioning processes. If compromised, OTP becomes predictable and no longer serves as a strong second factor.

70. Frage
(A Linux user password is identified as follows:
$2a$08$AbCh0RCM8p8FGaYvRLI0H.Kng54gcnWCOQYIhas708UEZRQQjGBh4
Which hash algorithm should be used to salt this password?)

A. SHA-512
B. bcrypt
C. NTLM
D. MD5

Antwort: B

Begründung:
The string format $2a$08$... is a well-known identifier for the bcrypt password hashing scheme. In common password-hash notation, the prefix indicates the algorithm and parameters: "$2a$" denotes bcrypt (version
2a), and "08" indicates the cost factor (work factor) controlling how computationally expensive hashing is.
bcrypt is designed specifically for password storage: it includes a built-in salt and is intentionally slow and adaptive, making brute-force and GPU attacks far more expensive than fast general-purpose hashes like MD5 or SHA-512. NTLM and MD5 are obsolete for secure password storage due to speed and known weaknesses.
SHA-512, while cryptographically strong as a hash, is still too fast for password hashing unless used in a dedicated password-hashing construction (e.g., PBKDF2, scrypt, Argon2) with appropriate parameters and salts. Since the given hash clearly matches bcrypt's encoding, the correct algorithm is bcrypt, which incorporates salting and cost-based key stretching as part of its design.

71. Frage
(Why should an asymmetric private key be used to encrypt the digest of an application?)

A. An asymmetric private key encrypts a small amount of information, which is decrypted with the corresponding private key.
B. 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.
C. An asymmetric private key encrypts and decrypts data in blocks of characters at a time with a complex algorithm.
D. An asymmetric private key uses the same key to encrypt and decrypt large amounts of media, one bit at a time.

Antwort: B

Begründung:
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.

72. Frage
(What are the primary characteristics of Bitcoin proof of work?)

A. Difficult to produce and difficult to verify
B. Easy to produce and difficult to verify
C. Difficult to produce and easy to verify
D. Easy to produce and easy to verify

Antwort: C

Begründung:
Bitcoin's proof of work (PoW) is designed so that finding a valid block is computationally difficult, but checking validity is computationally easy. Miners must repeatedly hash candidate block headers (double SHA-256) with different nonces until they find a hash value below a network-defined target.
This trial-and-error search requires significant work and energy because the probability of success per attempt is extremely low at current difficulty levels. However, verification is straightforward: any node can hash the block header once (or a small number of times) and confirm the resulting hash meets the target threshold and that the block contents follow protocol rules. This "hard to produce, easy to verify" property is essential: it makes it expensive for attackers to rewrite history or outpace honest miners, while allowing all participants-even low-power devices-to validate blocks efficiently.
Therefore, the primary characteristic of Bitcoin proof of work is that it is difficult to produce and easy to verify.

73. Frage
(Which mechanism can be applied to protect the integrity of plaintext when using AES?)

A. RC4
B. Message Authentication Code (MAC)
C. Kerberos key sharing
D. RSA

Antwort: B

Begründung:
AES by itself is a symmetric block cipher that provides confidentiality, but not guaranteed integrity unless used in an authenticated mode. To protect integrity of the plaintext (ensuring it has not been altered), a Message Authentication Code (MAC) can be applied. In the classic Encrypt-then-MAC pattern, the sender encrypts the plaintext with AES and then computes a MAC (often HMAC-SHA-256 or CMAC-AES) over the ciphertext (and relevant headers). The receiver verifies the MAC before attempting decryption, preventing tampering and many padding-oracle style vulnerabilities. Alternatively, AES can be used in an AEAD mode like AES-GCM, which produces an authentication tag serving a similar purpose, but among the listed options the general integrity mechanism is "MAC." RC4 is an unrelated stream cipher and does not provide integrity.
RSA is asymmetric and not the standard integrity add-on for AES-encrypted bulk data. Kerberos is an authentication protocol and key distribution system, not a message integrity primitive. Therefore, to protect plaintext integrity when using AES, the correct mechanism is a Message Authentication Code.

74. Frage
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