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| Section | Objectives |
|---|---|
| Topic 1: Key Management and PKI | - Key exchange and lifecycle management - Certificates, certificate authorities, and PKI structure |
| Topic 2: Foundations of Cryptography | - Historical and modern cryptography principles - Core concepts of confidentiality, integrity, authentication, non-repudiation |
| Topic 3: Hash Functions and Message Authentication | - Cryptographic hash functions (e.g., SHA family concepts) - MAC and HMAC mechanisms |
| Topic 4: Symmetric Encryption | - Block and stream ciphers - AES and legacy algorithms (e.g., DES conceptually) |
| Topic 5: Asymmetric Encryption | - RSA and ECC fundamentals - Public key cryptography principles |
| Topic 6: Cryptographic Protocols and Applications | - TLS/SSL conceptual overview - Secure communication design principles |
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NEW QUESTION # 54
(Why should an asymmetric private key be used to encrypt the digest of an application?)
Answer: C
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 # 55
(Which lesson can be learned from organizations that experience breaches due to poor cryptographic practices?)
Answer: C
Explanation:
Breaches tied to poor cryptographic practices often stem from preventable issues: outdated algorithms, weak key management, misconfigured TLS, missing integrity checks, hard-coded secrets, unrotated keys, or improper certificate validation. A key lesson is that organizations must proactively identify and prioritize these risks-exactly what comprehensive risk assessments are designed to do. Effective risk assessment inventories cryptographic assets (keys, certificates, protocols), maps them to business processes, evaluates threats (e.g., MITM, data exfiltration, supply-chain tampering), and finds gaps between current controls and best practices. It also helps ensure crypto decisions align with real-world risk, compliance requirements, and operational constraints. The other options are explicitly wrong: training is relevant because many crypto failures are implementation/configuration errors; audits and updates are essential because cryptographic guidance evolves; and security cannot be "secondary" without increasing breach likelihood and impact.
Therefore, the most defensible lesson is that comprehensive risk assessments are vital for identifying vulnerabilities before attackers exploit them.
NEW QUESTION # 56
(What is the correlation between the number of rounds and the key length used in the AES algorithm?)
Answer: D
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 # 57
(What is the length of the Initialization Vector (IV) in WEP?)
Answer: D
Explanation:
WEP (Wired Equivalent Privacy) uses the RC4 stream cipher and combines a per-packet Initialization Vector (IV) with a shared secret key to form the RC4 seed for that packet's keystream. The IV in WEP is 24 bits long and is transmitted in the clear as part of the 802.11 frame so the receiver can reconstruct the same per-packet RC4 key stream. The short IV space (2²# possible values) is a major design weakness: on a busy network, IVs repeat frequently, causing keystream reuse. Because RC4 is a stream cipher, keystream reuse enables attackers to derive relationships between plaintexts and recover keys with statistical attacks (notably the Fluhrer, Mantin, and Shamir (FMS) family of attacks and related improvements). WEP also uses a CRC-32 integrity check (ICV) that is not cryptographically strong and is vulnerable to modification attacks. The 24-bit IV length is therefore a key reason WEP is considered insecure and has been replaced by WPA/WPA2 mechanisms that use stronger key mixing, larger nonces/IVs, and robust integrity protection.
NEW QUESTION # 58
(What is the maximum key size (in bits) supported by AES?)
Answer: A
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 # 59
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