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| Section | Objectives |
|---|---|
| Foundations of Cryptography | - Historical and modern cryptography principles - Core concepts of confidentiality, integrity, authentication, non-repudiation |
| Cryptographic Protocols and Applications | - TLS/SSL conceptual overview - Secure communication design principles |
| Hash Functions and Message Authentication | - Cryptographic hash functions (e.g., SHA family concepts) - MAC and HMAC mechanisms |
| Asymmetric Encryption | - Public key cryptography principles - RSA and ECC fundamentals |
| Symmetric Encryption | - Block and stream ciphers - AES and legacy algorithms (e.g., DES conceptually) |
| Key Management and PKI | - Key exchange and lifecycle management - Certificates, certificate authorities, and PKI structure |
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NEW QUESTION # 70
(What is the RC4 encryption key size when utilizing WPA with Temporal Key Integrity Protocol (TKIP)?)
Answer: C
Explanation:
WPA with TKIP was designed as an interim improvement over WEP while still using the RC4 stream cipher for compatibility with legacy hardware. TKIP addresses WEP's major weaknesses by introducing per-packet key mixing, a message integrity mechanism ("Michael"), and replay protection.
In TKIP, the encryption key used with RC4 is 128 bits. Practically, TKIP derives a per-packet RC4 key from a 128-bit temporal key (TK), the transmitter's MAC address, and a sequence counter (TKIP Sequence Counter, TSC) to avoid the simple IV reuse patterns that made WEP easy to break. Even with these improvements, TKIP has known weaknesses and is deprecated in favor of WPA2/WPA3 using AES-based CCMP/GCMP. But strictly for the question asked, TKIP's RC4 keying material is based on a 128-bit key size, not 40/56-bit legacy sizes and not 256-bit.
NEW QUESTION # 71
(How does adding salt to a password improve security?)
Answer: C
Explanation:
A salt is a unique, random value stored alongside a password hash and combined with the password during hashing. Its main security benefit is that it ensures identical passwords do not produce identical hashes across different accounts or systems. If two users choose the same password, their stored hashes will differ because their salts differ, which directly prevents attackers from spotting shared passwords by comparing hashes. Salts also defeat precomputation attacks such as rainbow tables, because an attacker would need to regenerate tables for each possible salt value-a task that becomes infeasible when salts are large and unique per password. Salt does not enforce password complexity rules (that's a policy/validation function), does not guarantee users choose different passwords, and does not prevent password reuse across sites. The correct statement is that salt makes the resulting hash different even for the same password, improving resistance to offline cracking at scale and eliminating the "same hash = same password" shortcut attackers rely on.
NEW QUESTION # 72
(Which type of exploit involves looking for different inputs that generate the same hash?)
Answer: C
Explanation:
A birthday attack targets hash functions by exploiting the birthday paradox: collisions (two different inputs producing the same hash output) can be found much faster than brute-forcing a specific preimage. For an n-bit hash, the expected work t o find any collision is on the order of 2
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