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| Section | Objectives |
|---|---|
| Hashing and Digital Signatures | - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) - Digital Signature Standards |
| Asymmetric Cryptography | - Diffie-Hellman Key Exchange - Elliptic Curve Cryptography (ECC) - RSA Algorithm - Public Key Infrastructure (PKI) |
| Symmetric Cryptography | - Block Ciphers (AES, DES, 3DES) - Stream Ciphers - Initialization Vectors (IV) - Key Management |
| Cryptography Fundamentals | - Symmetric vs Asymmetric Encryption - History and Evolution of Cryptography - Cryptographic Terminology |
| Applied Cryptography | - Cryptographic Best Practices - SSL/TLS Protocols - VPN Security - PGP and Email Encryption |
| Cryptanalysis and Attacks | - Common Attack Vectors - Brute Force and Dictionary Attacks - Social Engineering Prevention |
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NEW QUESTION # 75
(Quantum computing poses a threat to which cryptographic algorithm?)
Answer: A
Explanation:
Large-scale quantum computers threaten many widely deployed public-key algorithms because quantum algorithms can solve their underlying hard math problems efficiently. In particular, Shor's algorithm can factor large integers and compute discrete logarithms in polynomial time, which directly breaks the security assumptions of RSA (factoring) and traditional Diffie-Hellman/ECC (discrete log). That makes RSA the clearest target among the options. By comparison, symmetric algorithms like AES are affected mainly by Grover's algorithm, which provides a quadratic speedup for brute force; this can be mitigated by using larger keys (e.g., AES-256). Hash functions like SHA-256 also face Grover-style speedups for preimage search, again mitigated by output length/security margin, and collision resistance is impacted differently. ECB is a mode of operation, not a standalone algorithm, and its issues are classical (pattern leakage), not specifically quantum. Therefore, the algorithm most directly threatened by quantum computing among the choices is RSA.
NEW QUESTION # 76
(What is the RC4 encryption key size when utilizing WPA with Temporal Key Integrity Protocol (TKIP)?)
Answer: A
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 # 77
(What describes how Counter (CTR) mode encryption functions?)
Answer: B
Explanation:
CTR mode turns a block cipher (like AES) into a stream-like construction by generating a keystream from successive encryptions of a changing input block. Specifically, CTR forms input blocks using a nonce (unique per message) combined with an increasing counter. Each nonce||counter block is encrypted with the block cipher under the shared key, producing a pseudorandom output block. That output is then XORed with plaintext to yield ciphertext (and XORed with ciphertext to recover plaintext). This design enables parallelization (blocks can be generated independently), efficient random access decryption, and avoids chaining dependencies seen in modes like CBC. Option B describes CFB-like behavior; option C describes ECB; option D describes CBC. CTR's security critically depends on never reusing the same nonce/counter sequence with the same key, because reuse would repeat keystream blocks and expose plaintext relationships. Therefore, the correct description is that CTR converts the block cipher into a stream cipher using a counter value and a nonce.
NEW QUESTION # 78
(How does Electronic Codebook (ECB) mode encryption function?)
Answer: C
Explanation:
ECB is the simplest block cipher mode: each plaintext block is encrypted independently using the same key and the block cipher primitive. There is no IV and no chaining, so identical plaintext blocks produce identical ciphertext blocks. This property leaks patterns and structure in the plaintext, which is why ECB is generally considered insecure for most real-world data beyond tiny, random-looking inputs. For example, images encrypted with ECB often reveal outlines because repeated pixel blocks map to repeated ciphertext blocks. Option A describes CTR mode, option C describes CBC mode, and option B resembles feedback-based modes. ECB's independence also means it can be parallelized, but the pattern leakage is a severe weakness. Modern practice prefers authenticated encryption modes (like GCM) or, at minimum, modes with IVs and chaining (like CBC with proper padding and MAC).
Therefore, the correct statement is that ECB encrypts each block with the same key and each block is independent of the others.
NEW QUESTION # 79
(Why did the National Institute of Standards and Technology (NIST) choose Ascon for lightweight cryptography?)
Answer: B
Explanation:
NIST's lightweight cryptography effort targets environments like IoT and embedded systems where CPU, memory, energy, and bandwidth are constrained, yet strong security is still required. Ascon is an authenticated encryption with associated data (AEAD) family designed to be efficient in both hardware and software with small footprint, making it well-suited for constrained devices. NIST selected Ascon because it offers a strong security design with good performance and implementability under tight resource budgets, while providing modern protections (confidentiality + integrity) through AEAD. That aligns with option C: secure and efficient encryption for resource-constrained devices. The selection was not primarily about authenticating users (that is typically handled by protocols and identity systems, not an AEAD primitive). It was also not mainly about legacy compatibility; lightweight cryptography aims at new and constrained deployments rather than preserving outdated stacks. And while Ascon can certainly be used to protect data at rest, that is only one application; the core reason for the choice is its suitability for constrained environments and robust, efficient authenticated encryption.
NEW QUESTION # 80
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