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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Hash Functions & Data Integrity | 15% | - Uses: integrity checks, password storage, message authentication - HMAC construction and application - Properties: collision resistance, one-way function - Algorithms: SHA-1, SHA-256, SHA-3, MD5 |
| Topic 2: Implementation & Best Practices | 5% | - Standards and compliance - Common mistakes and vulnerabilities - Selecting appropriate algorithms and key sizes |
| Topic 3: Symmetric Encryption | 25% | - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Algorithms: AES, DES, 3DES, Blowfish - Principles and operation - Key generation, distribution, and management challenges |
| Topic 4: Key Management & Secure Protocols | 10% | - Cryptographic attacks: brute force, birthday, man-in-the-middle - Key generation, storage, exchange, and destruction - Secure protocols: TLS/SSL, IPsec, SSH, PGP |
| Topic 5: Cryptography Fundamentals | 20% | - Basic terminology: plaintext, ciphertext, algorithm, key - Core goals: confidentiality, integrity, authentication, non-repudiation - Historical evolution and modern applications |
| Topic 6: Asymmetric Encryption & Public Key Infrastructure | 25% | - Digital signatures: purpose and process - PKI components: certificates, CAs, trust models - Algorithms: RSA, ECC, Diffie-Hellman - Principles: public/private key pairs - Certificate lifecycle: creation, validation, revocation |
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NEW QUESTION # 53
(Which symmetric encryption technique uses a 256-bit key size and a 128-bit block size?)
Answer: D
Explanation:
AES (Advanced Encryption Standard) is a symmetric block cipher standardized to operate on a fixed
128-bit block size and supports key sizes of 128, 192, and 256 bits. When the key size is 256 bits, the cipher is commonly referred to as AES-256, but the block size remains 128 bits regardless of key length.
This combination (256-bit key, 128-bit block) matches the question precisely. By comparison, DES uses a 64-bit block size with a 56-bit effective key. 3DES also uses a 64-bit block size and effectively applies DES three times, yielding an effective key length typically cited as 112 bits (two-key 3DES) or 168 bits (three-key 3DES), depending on how keys are configured. IDEA uses a 64-bit block size with a 128-bit key. Therefore, the only listed algorithm that supports a 256-bit key while maintaining a 128-bit block size is AES. This is one reason AES is widely adopted for modern symmetric encryption: strong key sizes with efficient implementation and broad standardization.
NEW QUESTION # 54
(Which type of exploit involves looking for different inputs that generate the same hash?)
Answer: D
Explanation:
A birthday attack targets hash functions by exploiting the birthday paradox: collisions (two different inputs producing the same hash output) can be found much faster than brute-forcing a specific preimage. For an n-bit hash, the expected work to findanycollision is on the order of 2
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