Introduction-to-Cryptography최신업데이트버전덤프 - Introduction-to-Cryptography최신업데이트인증덤프

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WGU Introduction-to-Cryptography Exam Syllabus Topics:

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최신 Courses and Certificates Introduction-to-Cryptography 무료샘플문제 (Q66-Q71):

질문 # 66
(Which wireless security standard uses an authentication server with 802.1X and EAP?)

• A. WPA-Enterprise
• B. TKIP
• C. WEP
• D. WPA-PSK

정답：A

설명：
802.1X is a port-based network access control framework that enables centralized authentication using an authentication server (commonly RADIUS). EAP (Extensible Authentication Protocol) runs within
802.1X to support many credential types (password-based methods like PEAP, certificate-based methods like EAP-TLS, and others). WPA-Enterprise is the wireless security mode that explicitly uses
802.1X + EAP with an authentication server to perform per-user/per-device authentication and to derive dynamic session keys. By contrast, WPA-PSK uses a pre-shared key without an external authentication server; all users share the same PSK, which is weaker for enterprise identity management. WEP is an older mechanism using static keys and does not provide modern 802.1X/EAP enterprise authentication in the WPA-Enterprise sense. TKIP is an encryption/integrity protocol used under WPA, not the full authentication "standard" involving an authentication server. Therefore, the correct choice is WPA-Enterprise.

질문 # 67
(What is the significance of the Nobody But Us (NOBUS) principle in cryptography?)

• A. It represents a widely used encryption standard.
• B. It indicates that a vulnerability is so difficult to exploit that only the entity that created it can exploit it.
• C. It refers to a cryptographic key that can be accessed by anyone.
• D. It denotes a cryptographic algorithm with known weaknesses.

정답：B

설명：
The NOBUS (Nobody But Us) principle is a controversial security notion suggesting that it is possible to introduce or maintain an access capability (often framed as a "backdoor" or exploitable weakness) that is effectively usable only by the party that designed it-typically a government or specific organization-while remaining infeasible for everyone else to exploit. In practice, NOBUS is invoked in debates about lawful access, surveillance, and exceptional access mechanisms: proponents claim that sophisticated entities can keep exploitation techniques secret and complex enough that adversaries cannot replicate them. Critics argue that this assumption is fragile because vulnerabilities can be independently discovered, reverse engineered, leaked, or eventually exploited as tools and knowledge spread. Moreover, once a weakness exists, it becomes a systemic risk: software and cryptographic systems are widely deployed and adversaries can invest heavily in finding and weaponizing the same flaw. Modern security engineering generally favors eliminating known weaknesses rather than relying on secrecy or assumed asymmetry of capability. Therefore, the best description of NOBUS is that a vulnerability is believed to be so difficult to exploit that only its creator can exploit it.

질문 # 68
(Which of the following best describes lightweight cryptography?)

• A. Cryptographic methods that are only applicable in military settings
• B. Cryptography that focuses solely on increasing encryption strength
• C. Cryptographic algorithms designed for resource-constrained environments
• D. A method of encryption that is outdated and rarely used

정답：C

설명：
Lightweight cryptography refers to cryptographic primitives and profiles engineered for environments where computational resources are constrained-limited CPU, memory, power, bandwidth, and code size-while still requiring robust security. Typical targets include IoT sensors, embedded controllers, smart cards, RFID, wearables, and many mobile or edge deployments. The design goals emphasize efficiency (low energy consumption, small silicon area for hardware, small firmware footprint) and practical performance under constraints, often while providing modern security properties like authenticated encryption (confidentiality + integrity) and secure hashing. Lightweight cryptography is not simply "stronger encryption"; it balances security with implementability in constrained systems. It is also not restricted to military settings and is not inherently outdated-many lightweight designs are modern and motivated by the rapid growth of IoT and pervasive computing. Because constrained devices are common entry points for attackers, having secure primitives that fit those devices is a critical part of contemporary security architecture. Therefore, the best description is cryptographic algorithms designed for resource-constrained environments.

질문 # 69
(Which regulation requires organizations to implement strong encryption measures to protect credit card data?)

• A. Payment Card Industry Data Security Standard (PCI DSS)
• B. Health Insurance Portability and Accountability Act (HIPAA)
• C. General Data Protection Regulation (GDPR)
• D. California Consumer Privacy Act (CCPA)

정답：A

설명：
For protecting credit card data, the primary compliance framework is PCI DSS (Payment Card Industry Data Security Standard). PCI DSS is an industry standard created by major card brands and administered through the PCI Security Standards Council. It sets requirements for organizations that store, process, or transmit cardholder data, including controls around network security, access control, monitoring, and cryptography.
PCI DSS explicitly addresses encryption and protection of cardholder data (for example, protecting stored cardholder data and encrypting transmission over open, public networks, and using strong cryptography and secure protocols). CCPA and GDPR are privacy regulations focused on personal data rights and governance, and while they may encourage security measures, they are not specifically the card-industry security standard for payment data. HIPAA applies to protected health information, not payment card data. Therefore, the correct answer is PCI DSS.

질문 # 70
(Which type of encryption is Advanced Encryption Standard (AES) considered to be?)

• A. Asymmetric encryption
• B. Symmetric encryption
• C. Quantum encryption
• D. Hybrid encryption

정답：B

설명：
AES is a symmetric-key block cipher, meaning the same shared secret key is used for both encryption and decryption. It operates on fixed-size 128-bit blocks and supports key sizes of 128, 192, and 256 bits. Being symmetric, AES is efficient and well-suited for encrypting large volumes of data-files, disk encryption, VPN payloads, and bulk traffic in protocols like TLS once a session key is established. AES is not "hybrid" by itself; hybrid encryption refers to combining asymmetric cryptography (for key exchange or key wrapping) with symmetric cryptography (for bulk data encryption), and AES often plays the symmetric part of that hybrid design. It is not "quantum encryption," which is a separate, loosely used term sometimes referring to quantum key distribution or quantum-resistant algorithms. AES is also not asymmetric; it does not use public
/private key pairs. Therefore, AES is correctly classified as symmetric encryption, matching option D.

질문 # 71
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