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| Section | Weight | Objectives |
|---|---|---|
| Symmetric Encryption | 25% | - Key generation, distribution, and management challenges - Algorithms: AES, DES, 3DES, Blowfish - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Principles and operation |
| Implementation & Best Practices | 5% | - Selecting appropriate algorithms and key sizes - Standards and compliance - Common mistakes and vulnerabilities |
| Key Management & Secure Protocols | 10% | - Key generation, storage, exchange, and destruction - Secure protocols: TLS/SSL, IPsec, SSH, PGP - Cryptographic attacks: brute force, birthday, man-in-the-middle |
| Hash Functions & Data Integrity | 15% | - HMAC construction and application - Properties: collision resistance, one-way function - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - Uses: integrity checks, password storage, message authentication |
| Cryptography Fundamentals | 20% | - Core goals: confidentiality, integrity, authentication, non-repudiation - Basic terminology: plaintext, ciphertext, algorithm, key - Historical evolution and modern applications |
| Asymmetric Encryption & Public Key Infrastructure | 25% | - Certificate lifecycle: creation, validation, revocation - Principles: public/private key pairs - Algorithms: RSA, ECC, Diffie-Hellman - PKI components: certificates, CAs, trust models - Digital signatures: purpose and process |
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NEW QUESTION # 26
(What is a characteristic of Cipher Block Chaining (CBC) mode in cryptography?)
Answer: B
Explanation:
CBC mode introduces chaining between blocks to prevent the pattern leakage inherent in ECB. In CBC, each plaintext block is XORed with the previous ciphertext block before being encrypted with the block cipher. For the first block, CBC uses an Initialization Vector (IV) to serve as the "previous ciphertext" input. This makes encryption of each block dependent on the previous block's ciphertext, which is exactly the defining characteristic described in option A. CBC does not generate a continuous stream of key material-that describes stream ciphers or stream-like modes such as CTR/OFB. CBC also does not require a different key per operation; the same symmetric key is reused, while the IV must be fresh/unpredictable to ensure semantic security. The block size is determined by the underlying block cipher (e.g., AES is 128-bit blocks, DES/3DES are 64-bit blocks), not a fixed 32-bit size for CBC itself. Because CBC is not inherently authenticated, best practice is to pair it with a MAC (Encrypt-then-MAC) or use an AEAD mode instead.
NEW QUESTION # 27
(What is the RC4 encryption key size when utilizing WPA with Temporal Key Integrity Protocol (TKIP)?)
Answer: D
Explanation:
WPA with TKIP was designed as an interim improvement over WEP while still using the RC4 stream cipher for compatibility with legacy hardware. TKIP addresses WEP's major weaknesses by introducing per-packet key mixing, a message integrity mechanism ("Michael"), and replay protection.
In TKIP, the encryption key used with RC4 is 128 bits. Practically, TKIP derives a per-packet RC4 key from a 128-bit temporal key (TK), the transmitter's MAC address, and a sequence counter (TKIP Sequence Counter, TSC) to avoid the simple IV reuse patterns that made WEP easy to break. Even with these improvements, TKIP has known weaknesses and is deprecated in favor of WPA2/WPA3 using AES-based CCMP/GCMP. But strictly for the question asked, TKIP's RC4 keying material is based on a 128-bit key size, not 40/56-bit legacy sizes and not 256-bit.
NEW QUESTION # 28
(Which cryptographic operation uses a single key?)
Answer: D
Explanation:
Symmetric cryptography uses a single shared secret key for both encryption and decryption. This contrasts with asymmetric cryptography, which uses a key pair (public/private). Symmetric algorithms (like AES, ChaCha20) are efficient and well-suited for bulk data encryption, but they require a secure method for key distribution because both parties must possess the same secret. Hashing is not a keyed operation by default (though HMAC is keyed); it maps arbitrary data to a fixed-size digest and is primarily used for integrity checking, fingerprints, and password hashing constructions. Padding is a data formatting technique (e.g., PKCS#7) used to align plaintext to a block size; it is not a cryptographic "operation" that uses a key. Therefore, the cryptographic operation characterized by using one key shared between parties is symmetric encryption. In real systems, symmetric encryption is frequently combined with asymmetric methods for key exchange and with MACs/AEAD for integrity, producing the standard hybrid approach used in protocols like TLS and IPsec.
NEW QUESTION # 29
(What is the primary purpose of the Health Insurance Portability and Accountability Act (HIPAA) in relation to encryption?)
Answer: C
Explanation:
HIPAA is a U.S. regulation focused on protecting the privacy and security of protected health information (PHI). In relation to encryption, HIPAA's Security Rule requires covered entities and business associates to implement appropriate administrative, physical, and technical safeguards to ensure the confidentiality, integrity, and availability of electronic PHI. Encryption is widely recognized as a key technical safeguard for confidentiality-protecting PHI in transit (e.g., over networks) and at rest (e.g., on storage devices) by making data unreadable without the proper keys. HIPAA does not standardize encryption across all industries, nor does it prohibit electronic health records; it regulates how they must be protected. While HIPAA often uses the term "addressable" for encryption controls (meaning organizations must implement it if reasonable and appropriate, or document an equivalent alternative), the overarching purpose remains protection of patient information through secure measures, with encryption as a central mechanism. Therefore, the best answer is ensuring confidentiality of patient information through secure measures like encryption.
NEW QUESTION # 30
(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 # 31
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