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| Section | Objectives |
|---|---|
| Cryptography Fundamentals | - Cryptographic Terminology - History and Evolution of Cryptography - Symmetric vs Asymmetric Encryption |
| Asymmetric Cryptography | - Elliptic Curve Cryptography (ECC) - Diffie-Hellman Key Exchange - RSA Algorithm - Public Key Infrastructure (PKI) |
| Cryptanalysis and Attacks | - Common Attack Vectors - Brute Force and Dictionary Attacks - Social Engineering Prevention |
| Hashing and Digital Signatures | - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) - Digital Signature Standards |
| Applied Cryptography | - PGP and Email Encryption - VPN Security - SSL/TLS Protocols - Cryptographic Best Practices |
| Symmetric Cryptography | - Key Management - Block Ciphers (AES, DES, 3DES) - Initialization Vectors (IV) - Stream Ciphers |
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NEW QUESTION # 42
(Which mode of encryption uses an Initialization Vector (IV) to encrypt the first block and then uses the result to encrypt the next block?)
Answer: C
Explanation:
CBC mode introduces dependency between blocks to prevent the pattern leakage seen in ECB. It starts with a random (or unpredictable) IV for the first block. Before encrypting block 1, CBC XORs plaintext block 1 with the IV, then encrypts the result. For block 2 and onward, CBC XORs each plaintext block with the previous ciphertext block before encryption. This chaining means that changing one plaintext block affects that block's ciphertext and also influences the next block's computation. The IV ensures that encrypting the same message twice under the same key produces different ciphertexts (assuming a fresh IV). Option A (ECB) has no IV or chaining. OFB and CFB are feedback modes that effectively generate a keystream; they do use an IV, but the "uses the result to encrypt the next block" wording most directly matches CBC's ciphertext-chaining description in standard teaching. CBC still requires integrity protection (e.g., HMAC or an AEAD mode) because it can be malleable without authentication. Therefore, the correct mode is Cipher Block Chaining (CBC).
NEW QUESTION # 43
(What is the Enigma machine known for in the history of cryptography?)
Answer: B
Explanation:
The Enigma machine is historically known as an electro-mechanical cipher device used primarily by Nazi Germany to secure military and diplomatic communications during World War II. It implemented a polyalphabetic substitution through a system of rotors, a reflector, and a plugboard, producing a large number of possible daily key settings. Operators would configure rotor order, ring settings, initial positions, and plugboard swaps, then type messages to generate ciphertext. Enigma's operational security depended heavily on correct procedures and secrecy of keys; weaknesses in procedures and design properties, combined with brilliant cryptanalysis and engineering efforts by Allied codebreakers (notably at Bletchley Park), enabled large-scale decryption of Enigma-encrypted traffic. In cryptography history, Enigma represents the transition from manual ciphers to machine-assisted encryption and demonstrates how both mathematics and operational practices determine real-world security. It is not simply an "algorithm" in the modern software sense, and it is not a decryption method or email encryption tool. Therefore, the correct description is that it was a device used for secure communication during WWII.
NEW QUESTION # 44
(Why is it important for cryptography frameworks to adapt over time?)
Answer: C
Explanation:
Cryptography must evolve because threats, computing capabilities, and attack techniques continuously change. Algorithms once considered safe can become vulnerable due to cryptanalysis, implementation attacks, protocol flaws, or sheer increases in available compute power. Examples include the deprecation of SHA-1 for signatures, weakening of RC4, and migration away from older TLS versions and weak cipher suites. Frameworks also need to adapt to new environments-cloud architectures, IoT deployments, mobile devices-and new adversary models, including the long-term risk posed by quantum computing to current public-key systems. Adaptation includes updating standards, increasing key sizes where needed, adopting modern primitives (AEAD modes, stronger KDFs), improving key management practices (rotation, hardware- backed storage), and refining operational guidance (certificate lifetimes, revocation strategies). A rigid structure that never changes would lock organizations into obsolete protections and accumulate risk.
Standardizing obsolete techniques or complying with outdated standards is the opposite of sound security engineering. Therefore, cryptography frameworks must adapt over time to respond to emerging threats and vulnerabilities and to maintain effective protection as the landscape evolves.
NEW QUESTION # 45
(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 # 46
(Which wireless security standard uses an authentication server with 802.1X and EAP?)
Answer: B
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 # 47
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