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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Symmetric Encryption | 25% | - Algorithms: AES, DES, 3DES, Blowfish - Key generation, distribution, and management challenges - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Principles and operation |
| Topic 2: Hash Functions & Data Integrity | 15% | - Properties: collision resistance, one-way function - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - HMAC construction and application - Uses: integrity checks, password storage, message authentication |
| Topic 3: Implementation & Best Practices | 5% | - Standards and compliance - Selecting appropriate algorithms and key sizes - Common mistakes and vulnerabilities |
| Topic 4: Cryptography Fundamentals | 20% | - Basic terminology: plaintext, ciphertext, algorithm, key - Historical evolution and modern applications - Core goals: confidentiality, integrity, authentication, non-repudiation |
| Topic 5: 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 |
| Topic 6: Asymmetric Encryption & Public Key Infrastructure | 25% | - Digital signatures: purpose and process - Principles: public/private key pairs - Algorithms: RSA, ECC, Diffie-Hellman - PKI components: certificates, CAs, trust models - Certificate lifecycle: creation, validation, revocation |
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NEW QUESTION # 11
(How often are transactions added to a blockchain?)
Answer: D
Explanation:
For Bitcoin, transactions are confirmed by inclusion in blocks, and the network targets an average block interval of about 10 minutes. That means transactions are "added" to the Bitcoin blockchain approximately every 10 minutes in the sense that a new block containing a batch of transactions is appended at that cadence.
The 10-minute target is achieved by a difficulty adjustment mechanism that recalibrates mining difficulty roughly every 2016 blocks, aiming to keep the average interval stable despite changes in total network hash power. It is important to note that this is an average: blocks can be found faster or slower in the short term due to the probabilistic nature of proof-of-work mining. Other blockchains have different block times (seconds to minutes), but the question's options and typical curriculum context align with Bitcoin's 10-minute design.
Therefore, the correct choice is approximately every 10 minutes.
NEW QUESTION # 12
(What is the value of 23 mod 6?)
Answer: C
Explanation:
The expression 23 mod 6 asks for the remainder when 23 is divided by 6. Modular arithmetic is foundational in cryptography, especially in public-key systems (RSA, Diffie-Hellman, ECC) where operations occur in finite rings or fields. To compute 23 mod 6, identify the largest multiple of 6 that does not exceed 23.
Multiples of 6 are 6, 12, 18, 24. Since 24 is greater than 23, the largest valid multiple is 18. Subtract: 23 # 18
= 5, so the remainder is 5. Therefore, 23 mod 6 = 5, which corresponds to option "05." Modular reduction keeps numbers within a fixed range (0 to modulus#1), enabling stable arithmetic under wraparound behavior.
In cryptographic protocols, this wraparound property is essential for defining groups and ensuring operations remain bounded and consistent.
NEW QUESTION # 13
(How are limits managed for the number of bitcoins that can be created and stored in a blockchain?)
Answer: A
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 # 14
(What describes a true random number generator?)
Answer: A
Explanation:
A true random number generator (TRNG) draws randomness from physical phenomena that are inherently unpredictable and not algorithmically reproducible. Because of this, it is nondeterministic: you cannot feed it the same "input" and expect the same output stream. TRNGs are often slower than PRNGs because they depend on collecting entropy from hardware sources and may require conditioning to remove bias. This aligns with option B: slow and nondeterministic, producing different results even under similar or repeated conditions. Option A describes a deterministic PRNG, where identical seeds yield identical sequences. Option C is unrelated; factorization is a hard math problem used in cryptography (e.g., RSA security assumptions), not a randomness generator definition. Option D describes a counter, which is deterministic and not random.
In secure systems, TRNG output may seed a cryptographically secure PRNG to provide both unpredictability and high throughput; but the defining characteristic of a TRNG is nondeterminism from physical entropy.
Therefore, option B is correct.
NEW QUESTION # 15
(Which lesson can be learned from organizations that experience breaches due to poor cryptographic practices?)
Answer: A
Explanation:
Breaches tied to poor cryptographic practices often stem from preventable issues: outdated algorithms, weak key management, misconfigured TLS, missing integrity checks, hard-coded secrets, unrotated keys, or improper certificate validation. A key lesson is that organizations must proactively identify and prioritize these risks-exactly what comprehensive risk assessments are designed to do. Effective risk assessment inventories cryptographic assets (keys, certificates, protocols), maps them to business processes, evaluates threats (e.g., MITM, data exfiltration, supply-chain tampering), and finds gaps between current controls and best practices. It also helps ensure crypto decisions align with real-world risk, compliance requirements, and operational constraints. The other options are explicitly wrong: training is relevant because many crypto failures are implementation/configuration errors; audits and updates are essential because cryptographic guidance evolves; and security cannot be "secondary" without increasing breach likelihood and impact.
Therefore, the most defensible lesson is that comprehensive risk assessments are vital for identifying vulnerabilities before attackers exploit them.
NEW QUESTION # 16
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