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| Section | Weight | Objectives |
|---|---|---|
| Asymmetric Encryption & Public Key Infrastructure | 25% | - Algorithms: RSA, ECC, Diffie-Hellman - PKI components: certificates, CAs, trust models - Digital signatures: purpose and process - Certificate lifecycle: creation, validation, revocation - Principles: public/private key pairs |
| Implementation & Best Practices | 5% | - Common mistakes and vulnerabilities - Selecting appropriate algorithms and key sizes - Standards and compliance |
| Cryptography Fundamentals | 20% | - Basic terminology: plaintext, ciphertext, algorithm, key - Core goals: confidentiality, integrity, authentication, non-repudiation - Historical evolution and modern applications |
| Symmetric Encryption | 25% | - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Algorithms: AES, DES, 3DES, Blowfish - Key generation, distribution, and management challenges - Principles and operation |
| Hash Functions & Data Integrity | 15% | - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - Uses: integrity checks, password storage, message authentication - HMAC construction and application - Properties: collision resistance, one-way function |
| Key Management & Secure Protocols | 10% | - Secure protocols: TLS/SSL, IPsec, SSH, PGP - Key generation, storage, exchange, and destruction - Cryptographic attacks: brute force, birthday, man-in-the-middle |
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NEW QUESTION # 46
(What is a key benefit of using a cryptography framework?)
Answer: B
Explanation:
A cryptography framework provides a consistent, repeatable way to select, deploy, and manage cryptographic controls across an organization. Its key benefit is structure: it defines approved algorithms and key sizes, acceptable modes of operation, key management rules (generation, storage, rotation, revocation, backup), certificate handling, and secure protocol configurations (e.g., TLS settings). This reduces ad hoc implementations that often lead to vulnerabilities such as weak ciphers, key reuse, improper randomness, or missing integrity protections. A framework also clarifies roles and processes-who can access keys, how secrets are audited, and how exceptions are handled-improving governance and operational reliability.
Importantly, it does not guarantee perfect security; no framework can eliminate all risk, and secure outcomes still depend on correct implementation, monitoring, and maintenance. It also does not eliminate the need for training; human error is a major source of crypto misconfiguration. While frameworks help with compliance, they are not solely about regulation; they are about sound security engineering and lifecycle management.
Therefore, the primary benefit is providing a structured approach to implementing encryption practices.
NEW QUESTION # 47
(How are limits managed for the number of bitcoins that can be created and stored in a blockchain?)
Answer: B
Explanation:
Bitcoin's supply is controlled by protocol rules enforced by consensus: new bitcoins enter circulation through the block subsidy awarded to miners for producing valid blocks. This subsidy is programmed to halve at fixed intervals (every 210,000 blocks), which steadily reduces the rate of new coin creation over time and asymptotically approaches a capped total supply (commonly cited as 21 million BTC).
This mechanism is often called the halving schedule and is the primary way limits are managed. The number of participants is not fixed; anyone can run a node or mine. There is no per-country cap and no per-person maximum enforced by the protocol-addresses and ownership are not limited that way. The supply cap emerges from the decreasing issuance schedule combined with consensus validation rules that reject blocks creating coins beyond what the schedule allows. Therefore, the correct answer is that limits are managed because rewards for mining reduce over time.
NEW QUESTION # 48
(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 # 49
(Which wireless security standard uses an authentication server with 802.1X and EAP?)
Answer: A
Explanation:
802.1X is a port-based network access control framework that enables centralized authentication using an authentication server (commonly RADIUS). EAP (Extensible Authentication Protocol) runs within 802.1X to support many credential types (password-based methods like PEAP, certificate-based methods like EAP-TLS, and others). WPA-Enterprise is the wireless security mode that explicitly uses 802.1X + EAP with an authentication server to perform per-user/per-device authentication and to derive dynamic session keys. By contrast, WPA-PSK uses a pre-shared key without an external authentication server; all users share the same PSK, which is weaker for enterprise identity management. WEP is an older mechanism using static keys and does not provide modern 802.1X/EAP enterprise authentication in the WPA-Enterprise sense. TKIP is an encryption/integrity protocol used under WPA, not the full authentication "standard" involving an authentication server. Therefore, the correct choice is WPA-Enterprise.
NEW QUESTION # 50
(What is a characteristic of a hash function?)
Answer: C
Explanation:
A cryptographic hash function maps input data of arbitrary length to a fixed-length digest and is designed to be one-way: given a digest, it should be computationally infeasible to recover the original input (preimage resistance). This one-way property enables many security applications: file integrity checking (any change alters the digest), password storage (combined with salt and slow hashing), digital signatures (signing a digest rather than large data), and commitment schemes. Hash functions are not encryption because they do not support decryption; they intentionally discard information about the input. They also do not use public/private key pairs; those are features of asymmetric cryptography. "Reversible" is the opposite of the intended design goal. A well-designed hash also aims for collision resistance (hard to find two different inputs with the same digest) and second-preimage resistance. Among the answer choices, the defining characteristic that best captures what makes a hash function distinct is that it is one-way.
NEW QUESTION # 51
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