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| Section | Objectives |
|---|---|
| Symmetric Cryptography | - Block Ciphers (AES, DES, 3DES) - Key Management - Initialization Vectors (IV) - Stream Ciphers |
| Cryptography Fundamentals | - Cryptographic Terminology - Symmetric vs Asymmetric Encryption - History and Evolution of Cryptography |
| Applied Cryptography | - PGP and Email Encryption - Cryptographic Best Practices - VPN Security - SSL/TLS Protocols |
| Asymmetric Cryptography | - RSA Algorithm - Diffie-Hellman Key Exchange - Elliptic Curve Cryptography (ECC) - Public Key Infrastructure (PKI) |
| Hashing and Digital Signatures | - Digital Signature Standards - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) |
| Cryptanalysis and Attacks | - Common Attack Vectors - Brute Force and Dictionary Attacks - Social Engineering Prevention |
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NEW QUESTION # 87
(What are the primary characteristics of Bitcoin proof of work?)
Answer: D
Explanation:
Bitcoin's proof of work (PoW) is designed so that finding a valid block is computationally difficult, but checking validity is computationally easy. Miners must repeatedly hash candidate block headers (double SHA-
256) with different nonces until they find a hash value below a network-defined target. This trial-and-error search requires significant work and energy because the probability of success per attempt is extremely low at current difficulty levels. However, verification is straightforward: any node can hash the block header once (or a small number of times) and confirm the resulting hash meets the target threshold and that the block contents follow protocol rules. This "hard to produce, easy to verify" property is essential: it makes it expensive for attackers to rewrite history or outpace honest miners, while allowing all participants-even low- power devices-to validate blocks efficiently. Therefore, the primary characteristic of Bitcoin proof of work is that it is difficult to produce and easy to verify.
NEW QUESTION # 88
(Which mechanism implemented in WPA-Enterprise guards against bit-flipping exploits?)
Answer: B
Explanation:
Bit-flipping exploits target encryption modes or protocols that do not provide strong integrity, allowing attackers to modify ciphertext so that predictable changes occur in plaintext after decryption. To defend against this, protocols add an integrity mechanism that detects tampering. In WPA (including enterprise deployments), TKIP introduced a Message Integrity Check (MIC) called "Michael." The MIC is computed over the frame contents (with additional fields) and verified by the receiver; if an attacker flips bits in transit, the MIC verification fails, and the frame is rejected. While AES (used by WPA2's CCMP) also provides integrity via authenticated encryption, the option presented that directly names the tamper-detection mechanism associated with guarding against bit-flipping is MIC. A pre- shared key is an authentication/keying method (and not enterprise-mode anyway), and a "global encryption key" would be the opposite of what you want-global/static keys worsen security.
Therefore, the intended mechanism that mitigates bit-flipping by detecting unauthorized modifications is the Message Integrity Check.
NEW QUESTION # 89
(How can auditing enhance an organization ' s cryptographic practices?)
Answer: D
Explanation:
Auditing improves cryptographic practice by systematically evaluating whether cryptographic controls are correctly selected, implemented, configured, and maintained. Through audits, an organization can discover weak algorithms (e.g., deprecated hashes), improper key lengths, unsafe modes (e.g., unauthenticated CBC), missing integrity controls, poor certificate validation, and operational problems such as key reuse, weak randomness sources, inadequate rotation, or overly permissive access to key material. Audits also assess compliance with internal policy and external standards, ensuring crypto is used consistently across systems and that exceptions are documented and risk-managed. Importantly, auditing does not guarantee that incidents will never happen; it reduces risk by finding gaps before attackers do. It also does not eliminate the need for updates-audits often reveal that policies must evolve as threats and best practices change. Employee training can be recommended as an outcome of auditing, but audits do not automatically ensure training. Thus, the most accurate benefit is that auditing identifies weaknesses and drives corrective action, strengthening cryptographic posture over time.
NEW QUESTION # 90
(Which encryption mode is known for supporting parallel processing?)
Answer: C
Explanation:
ECB (Electronic Codebook) mode encrypts each block independently with the same key, which makes it naturally amenable to parallel processing: multiple blocks can be encrypted or decrypted simultaneously because there is no chaining dependency between blocks. This is in contrast to CBC encryption, where each plaintext block is XORed with the previous ciphertext block, creating a dependency that prevents straightforward parallelization of encryption (though CBC decryption can be parallelized because ciphertext blocks are already known). Feedback modes like CFB and OFB generate keystream material sequentially, where each step depends on the previous state, limiting parallelism. While ECB's parallelism is an implementation advantage, it is widely discouraged for most real data because it leaks patterns-identical plaintext blocks produce identical ciphertext blocks. Modern systems prefer parallel-friendly and secure modes such as CTR or GCM, but among the listed options, the mode most known for parallel processing is ECB due to block independence. Therefore, the correct answer is Electronic Codebook (ECB).
NEW QUESTION # 91
(Why should an administrator choose lightweight cryptography?)
Answer: A
Explanation:
Lightweight cryptography is designed for constrained environments-devices with limited CPU, memory, storage, bandwidth, and power (battery). Examples include IoT sensors, smart locks, RFID tags, embedded controllers, and industrial devices. Administrators choose lightweight algorithms and protocols to maintain reasonable security while fitting strict resource budgets and real-time constraints.
The goal is not "weaker security because data is unimportant," but rather efficient security that can still meet threat models under constraints. Option B captures this: embedded systems often cannot afford the computational cost of heavy cryptographic primitives (large key sizes, complex modes, frequent handshakes) or may struggle with latency and energy consumption. Option A is irrelevant because physical security of a desktop doesn't remove the need for cryptography in communications or storage. Option C is the opposite of lightweight design. Option D is a poor justification; security design should be based on risk, and lightweight cryptography is not merely for "minimal protection," but for practical deployability under constraints. Therefore, the correct reason is limited resources on embedded systems.
NEW QUESTION # 92
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