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| Section | Objectives |
|---|---|
| Hash Functions and Message Authentication | - MAC and HMAC mechanisms - Cryptographic hash functions (e.g., SHA family concepts) |
| Symmetric Encryption | - Block and stream ciphers - AES and legacy algorithms (e.g., DES conceptually) |
| Asymmetric Encryption | - RSA and ECC fundamentals - Public key cryptography principles |
| Key Management and PKI | - Key exchange and lifecycle management - Certificates, certificate authorities, and PKI structure |
| Cryptographic Protocols and Applications | - Secure communication design principles - TLS/SSL conceptual overview |
| Foundations of Cryptography | - Historical and modern cryptography principles - Core concepts of confidentiality, integrity, authentication, non-repudiation |
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NEW QUESTION # 81
(Which regulation requires organizations to implement strong encryption measures to protect credit card data?)
Answer: B
Explanation:
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.
NEW QUESTION # 82
(Why should an asymmetric private key be used to encrypt the digest of an application?)
Answer: A
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 # 83
(What is the correlation between the number of rounds and the key length used in the AES algorithm?)
Answer: A
Explanation:
In AES, the number of rounds is explicitly tied to the key length. AES-128 uses 10 rounds, AES-192 uses 12 rounds, and AES-256 uses 14 rounds. The purpose of additional rounds is to increase diffusion and confusion, strengthening resistance against cryptanalysis as the key schedule and state transformations iterate more times. Although key length primarily affects brute-force resistance, AES's designers and standardization parameters link longer keys with more rounds to maintain security margins across variants, especially considering differences in the key schedule structure. Thus, as key length increases from 128 to 192 to 256 bits, the number of rounds increases correspondingly from 10 to 12 to 14. This relationship is fixed by the AES specification and does not vary dynamically at runtime. Therefore, the correct correlation is that the number of rounds increases as the key length increases.
NEW QUESTION # 84
(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?)
Answer: C
NEW QUESTION # 85
(What is the maximum key size (in bits) supported by AES?)
Answer: C
Explanation:
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.
NEW QUESTION # 86
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