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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Hash Functions & Data Integrity | 15% | - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - Uses: integrity checks, password storage, message authentication - Properties: collision resistance, one-way function - HMAC construction and application |
| Topic 2: Implementation & Best Practices | 5% | - Selecting appropriate algorithms and key sizes - Common mistakes and vulnerabilities - Standards and compliance |
| 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: Symmetric Encryption | 25% | - Principles and operation - Algorithms: AES, DES, 3DES, Blowfish - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Key generation, distribution, and management challenges |
| Topic 5: Key Management & Secure Protocols | 10% | - Cryptographic attacks: brute force, birthday, man-in-the-middle - Secure protocols: TLS/SSL, IPsec, SSH, PGP - Key generation, storage, exchange, and destruction |
| Topic 6: Asymmetric Encryption & Public Key Infrastructure | 25% | - PKI components: certificates, CAs, trust models - Certificate lifecycle: creation, validation, revocation - Algorithms: RSA, ECC, Diffie-Hellman - Principles: public/private key pairs - Digital signatures: purpose and process |
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NEW QUESTION # 37
(What is the relationship between Secure Sockets Layer (SSL) and Transport Layer Security (TLS)?)
Answer: B
Explanation:
TLS is the modern successor to SSL. SSL (notably SSL 2.0 and SSL 3.0) was an early protocol family for securing network communications, providing encryption, integrity, and endpoint authentication for applications like HTTPS. Over time, weaknesses were discovered in SSL's design and in the cryptographic mechanisms commonly used with it. TLS was introduced as an improved, standardized evolution (starting with TLS 1.0, based on SSL 3.0 but with important fixes), and later versions (TLS 1.2 and TLS 1.3) significantly strengthened security by removing weak ciphers, improving key exchange, and tightening handshake and record protections. In practice, when people say "SSL" today, they often mean "TLS," but true SSL is deprecated and should not be used. SSL is not a replacement of TLS, and the two are not identical in security-TLS versions incorporate substantial improvements and modern cryptographic best practices. SSL is also not limited to email; it was widely used for web traffic and other protocols. Therefore, the correct relationship is that TLS replaced SSL to provide improved security.
NEW QUESTION # 38
(Which number generator has different results given the same input data?)
Answer: B
Explanation:
A true random number generator (TRNG) produces outputs derived from nondeterministic physical processes (e.g., thermal noise, oscillator jitter, radioactive decay, or other hardware entropy sources). Because the underlying phenomenon is not algorithmically determined by an input seed in the same way as a PRNG, repeated "inputs" (or identical conditions from a software perspective) do not yield the same sequence; the outputs vary unpredictably. By contrast, a pseudorandom number generator (PRNG) is deterministic: given the same seed and internal state, it produces the same output sequence, which is useful for repeatability but means security depends on seed secrecy and proper seeding. "Prime" is not a generator type, and "sequence" is too generic and does not imply nondeterminism. In cryptographic systems, TRNGs (or hardware entropy sources) are often used to seed cryptographically secure PRNGs (CSPRNGs), combining high-quality entropy with efficient generation. Therefore, the generator that can produce different results for the "same input data" is a true random number generator.
NEW QUESTION # 39
(What makes the RC4 cipher unique compared to RC5 and RC6?)
Answer: A
Explanation:
RC4 is unique among the RC family listed because it is a stream cipher. It generates a pseudorandom keystream and encrypts data by XORing that keystream with plaintext bytes (and decryption is the same XOR operation). This differs from RC5 and RC6, which are block ciphers: they encrypt fixed-size blocks of data through multiple rounds of operations (such as modular addition, XOR, and rotations) using a secret key. The stream-cipher design means RC4 historically fit protocols where data arrives continuously (e.g., early wireless and web encryption) and where simple, fast software implementation was desired. However, stream ciphers demand careful handling of nonces/IVs to avoid keystream reuse; reuse can catastrophically leak plaintext relationships. RC4 also has well-documented statistical biases in its keystream, leading to practical attacks in protocols like WEP and later concerns in TLS, which is why RC4 has been deprecated in modern security standards. Still, from a classification standpoint, "stream" is the distinguishing characteristic versus RC5/RC6 being block ciphers.
NEW QUESTION # 40
(What is a characteristic of Cipher Block Chaining (CBC) mode in cryptography?)
Answer: A
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 # 41
(What is an attribute of RC4 when used with WEP?)
Answer: B
Explanation:
In classic WEP deployments, RC4 was used with what is commonly called "40-bit WEP" (also labeled "64- bit WEP" because it combines a 40-bit secret key with a 24-bit IV to form a 64-bit RC4 seed). The key attribute emphasized in many foundational descriptions of WEP is this 40-bit shared secret length, which was originally chosen due to export restrictions and legacy constraints. Although "104-bit WEP" (sometimes called "128-bit WEP," again counting the 24-bit IV) also existed, the option set here points to the historically standard and widely referenced attribute: a 40-bit key when RC4 is used in WEP. Importantly, WEP's security failure is not only about key size; the 24-bit IV is too small and repeats frequently, and WEP's key scheduling vulnerabilities combined with IV reuse allow attackers to recover the secret key with enough captured frames. Still, among the given options, the correct attribute is the 40-bit key.
NEW QUESTION # 42
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