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| Section | Objectives |
|---|---|
| Applied Cryptography | - SSL/TLS Protocols - VPN Security - PGP and Email Encryption - Cryptographic Best Practices |
| Asymmetric Cryptography | - Public Key Infrastructure (PKI) - Elliptic Curve Cryptography (ECC) - Diffie-Hellman Key Exchange - RSA Algorithm |
| Cryptanalysis and Attacks | - Common Attack Vectors - Brute Force and Dictionary Attacks - Social Engineering Prevention |
| Hashing and Digital Signatures | - Digital Signature Standards - Hash Functions (MD5, SHA-1, SHA-256) - Message Authentication Codes (MAC) |
| Cryptography Fundamentals | - Cryptographic Terminology - Symmetric vs Asymmetric Encryption - History and Evolution of Cryptography |
| Symmetric Cryptography | - Key Management - Block Ciphers (AES, DES, 3DES) - Initialization Vectors (IV) - Stream Ciphers |
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NEW QUESTION # 16
(Which symmetric encryption technique uses a 256-bit key size and a 128-bit block size?)
Answer: B
Explanation:
AES (Advanced Encryption Standard) is a symmetric block cipher standardized to operate on a fixed 128-bit block size and supports key sizes of 128, 192, and 256 bits. When the key size is 256 bits, the cipher is commonly referred to as AES-256, but the block size remains 128 bits regardless of key length. This combination (256-bit key, 128-bit block) matches the question precisely. By comparison, DES uses a 64-bit block size with a 56-bit effective key. 3DES also uses a 64-bit block size and effectively applies DES three times, yielding an effective key length typically cited as 112 bits (two-key 3DES) or 168 bits (three-key
3DES), depending on how keys are configured. IDEA uses a 64-bit block size with a 128-bit key. Therefore, the only listed algorithm that supports a 256-bit key while maintaining a 128-bit block size is AES. This is one reason AES is widely adopted for modern symmetric encryption: strong key sizes with efficient implementation and broad standardization.
NEW QUESTION # 17
(Which attack maps hashed values to their original input data?)
Answer: D
Explanation:
A rainbow table attack uses large, precomputed tables that link hash outputs back to likely original inputs (typically passwords). Instead of storing every password#hash pair directly (which would be huge), rainbow tables store chains created by alternating hash operations with reduction functions, allowing attackers to reconstruct candidate plaintexts that produce a given hash. This makes cracking fast , if the target hashes are unsalted and use a known, fast hash function. Salt defeats rainbow tables because the attacker would need separate tables for each salt value, which becomes infeasible when salts are unique and sufficiently large. A dictionary at tack is related but typically computes hashes on the fly from a wordlist rather than using precomputed chain structures. A birthday attack targets collisions, not mapping to original data. Brute-force tries all candidates without precomputation. Because th e question explicitly describes mapping hashed values back to original data via a precomputed approach, the correct choice is Rainbow table.
NEW QUESTION # 18
(A security analyst is using 3DES for data encryption. Which 3DES key size is valid?)
Answer: A
Explanation:
3DES (Triple DES) applies the DES block cipher three times to increase effective security, and its commonly cited valid key sizes correspond to how many independent DES keys are used. Two-key
3DES uses two 56-bit DES keys (K1 and K2) in an EDE sequence (Encrypt with K1, Decrypt with K2, Encrypt with K1), yielding 112 bits of keying material (ignoring parity bits). Three-key 3DES uses three independent 56-bit keys for a total of 168 bits of keying material, but that option is not listed here.
A 56-bit key corresponds to single DES, not 3DES. 128-bit is associated with AES, not 3DES. 2,048-bit is typical for RSA keys, not symmetric ciphers. Therefore, among the choices provided, 112-bit is a valid 3DES key size. While 3DES is now deprecated for many uses due to its 64-bit block size and performance limitations, understanding its keying options remains important for legacy system assessment.
NEW QUESTION # 19
(What are the roles of keys when using digital signatures?)
Answer: B
NEW QUESTION # 20
(Why is it important for cryptography frameworks to adapt over time?)
Answer: A
Explanation:
Cryptography must evolve because threats, computing capabilities, and attack techniques continuously change. Algorithms once considered safe can become vulnerable due to cryptanalysis, implementation attacks, protocol flaws, or sheer increases in available compute power. Examples include the deprecation of SHA-1 for signatures, weakening of RC4, and migration away from older TLS versions and weak cipher suites. Frameworks also need to adapt to new environments-cloud architectures, IoT deployments, mobile devices-and new adversary models, including the long-term risk posed by quantum computing to current public-key systems. Adaptation includes updating standards, increasing key sizes where needed, adopting modern primitives (AEAD modes, stronger KDFs), improving key management practices (rotation, hardware- backed storage), and refining operational guidance (certificate lifetimes, revocation strategies). A rigid structure that never changes would lock organizations into obsolete protections and accumulate risk.
Standardizing obsolete techniques or complying with outdated standards is the opposite of sound security engineering. Therefore, cryptography frameworks must adapt over time to respond to emerging threats and vulnerabilities and to maintain effective protection as the landscape evolves.
NEW QUESTION # 21
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