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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Symmetric Encryption | 25% | - Principles and operation - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Key generation, distribution, and management challenges - Algorithms: AES, DES, 3DES, Blowfish |
| Topic 2: Asymmetric Encryption & Public Key Infrastructure | 25% | - Certificate lifecycle: creation, validation, revocation - Digital signatures: purpose and process - Principles: public/private key pairs - PKI components: certificates, CAs, trust models - Algorithms: RSA, ECC, Diffie-Hellman |
| Topic 3: Cryptography Fundamentals | 20% | - Core goals: confidentiality, integrity, authentication, non-repudiation - Historical evolution and modern applications - Basic terminology: plaintext, ciphertext, algorithm, key |
| Topic 4: Key Management & Secure Protocols | 10% | - Secure protocols: TLS/SSL, IPsec, SSH, PGP - Cryptographic attacks: brute force, birthday, man-in-the-middle - Key generation, storage, exchange, and destruction |
| Topic 5: Implementation & Best Practices | 5% | - Selecting appropriate algorithms and key sizes - Common mistakes and vulnerabilities - Standards and compliance |
| Topic 6: Hash Functions & Data Integrity | 15% | - Properties: collision resistance, one-way function - HMAC construction and application - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - Uses: integrity checks, password storage, message authentication |
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NEW QUESTION # 43
(How is Public Key Infrastructure (PKI) commonly utilized in web browsers?)
Answer: C
Explanation:
Web browsers rely on PKI to establish trust in secure connections, primarily through X.509 certificates and a built-in set of trusted root Certificate Authorities (CAs). When a browser connects to an HTTPS site, the server presents a certificate chain. The browser validates that chain up to a trusted root, checks that the certificate is valid for the domain (SAN/CN matching), confirms validity dates, and may check revocation status. This PKI process allows browsers to authenticate the website's identity and negotiate encrypted session keys for TLS, enabling confidentiality and integrity for the connection. In practical terms, the browser' s PKI components include certificate stores, validation logic, and mechanisms for handling intermediates, trust policies, and revocation. While PKI supports authentication as an outcome, the best description of how browsers utilize PKI is that they manage and validate digital certificates and associated keys to establish trust.
PKI is not about compressing messages or encrypting data at rest; it is about identity binding and trust chains that make secure web communication possible.
NEW QUESTION # 44
(What is the correlation between the number of rounds and the key length used in the AES algorithm?)
Answer: C
Explanation:
In AES, the number of rounds is explicitly tied to the key length. AES-128 uses 10 rounds, AES-192 uses 12 rounds, and AES-256 uses 14 rounds. The purpose of additional rounds is to increase diffusion and confusion, strengthening resistance against cryptanalysis as the key schedule and state transformations iterate more times. Although key length primarily affects brute-force resistance, AES's designers and standardization parameters link longer keys with more rounds to maintain security margins across variants, especially considering differences in the key schedule structure. Thus, as key length increases from 128 to 192 to 256 bits, the number of rounds increases correspondingly from 10 to
12 to 14. This relationship is fixed by the AES specification and does not vary dynamically at runtime.
Therefore, the correct correlation is that the number of rounds increases as the key length increases.
NEW QUESTION # 45
(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 # 46
(Which attack may take the longest amount of time to achieve success?)
Answer: B
Explanation:
A brute-force attack exhaustively tries every possible key or password candidate until the correct one is found. Because it explores the full search space (or a very large portion of it), brute force is often the slowest method, especially when strong keys, long passwords, rate limits, and slow password hashing (bcrypt/Argon2) are used. By contrast, a dictionary attack reduces work by trying only common or likely passwords, often succeeding quickly against weak human-chosen secrets. Rainbow table attacks shift work into precomputation; once a table exists, lookup can be faster than brute-force-though salt and modern hashing defeat them. Birthday attacks are about finding collisions, not necessarily recovering a specific secret, and their expected work is about 2
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