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| Section | Objectives |
|---|---|
| Hash Functions and Message Authentication | - MAC and HMAC mechanisms - Cryptographic hash functions (e.g., SHA family concepts) |
| Foundations of Cryptography | - Core concepts of confidentiality, integrity, authentication, non-repudiation - Historical and modern cryptography principles |
| Cryptographic Protocols and Applications | - TLS/SSL conceptual overview - Secure communication design principles |
| Asymmetric Encryption | - RSA and ECC fundamentals - Public key cryptography principles |
| Key Management and PKI | - Certificates, certificate authorities, and PKI structure - Key exchange and lifecycle management |
| Symmetric Encryption | - Block and stream ciphers - AES and legacy algorithms (e.g., DES conceptually) |
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NEW QUESTION # 38
(Which cryptographic technique is used to ensure data integrity?)
Answer: B
Explanation:
Data integrity means ensuring that information has not been modified without authorization. Digital signatures are a core cryptographic technique that provides integrity by binding a message (typically its hash) to the signer's private key. The signer creates a signature over the message digest; the verifier checks it with the signer's public key and recomputes the digest. Any change to the message alters the digest and causes verification to fail, revealing tampering. Digital signatures also support authenticity (verifying the signer) and can contribute to nonrepudiation under proper key-management and policy controls, but integrity is a primary guarantee they deliver. "Authentication" is broader and can be achieved by other means, but it is not as directly tied to integrity as signatures in this option set. "Non-repudiation" is an outcome/goal rather than a standalone integrity technique. "Steganography" hides the existence of data and does not inherently protect integrity. Therefore, among these options, digital signatures are the best cryptographic technique for ensuring data integrity.
NEW QUESTION # 39
(Which type of encryption is Advanced Encryption Standard (AES) considered to be?)
Answer: B
Explanation:
AES is a symmetric-key block cipher, meaning the same shared secret key is used for both encryption and decryption. It operates on fixed-size 128-bit blocks and supports key sizes of 128, 192, and 256 bits. Being symmetric, AES is efficient and well-suited for encrypting large volumes of data-files, disk encryption, VPN payloads, and bulk traffic in protocols like TLS once a session key is established. AES is not "hybrid" by itself; hybrid encryption refers to combining asymmetric cryptography (for key exchange or key wrapping) with symmetric cryptography (for bulk data encryption), and AES often plays the symmetric part of that hybrid design. It is not "quantum encryption," which is a separate, loosely used term sometimes referring to quantum key distribution or quantum-resistant algorithms. AES is also not asymmetric; it does not use public
/private key pairs. Therefore, AES is correctly classified as symmetric encryption, matching option D.
NEW QUESTION # 40
(How does adding salt to a password improve security?)
Answer: C
Explanation:
A salt is a unique, random value stored alongside a password hash and combined with the password during hashing. Its main security benefit is that it ensures identical passwords do not produce identical hashes across different accounts or systems. If two users choose the same password, their stored hashes will differ because their salts differ, which directly prevents attackers from spotting shared passwords by comparing hashes. Salts also defeat precomputation attacks such as rainbow tables, because an attacker would need to regenerate tables for each possible salt value-a task that becomes infeasible when salts are large and unique per password. Salt does not enforce password complexity rules (that's a policy/validation function), does not guarantee users choose different passwords, and does not prevent password reuse across sites. The correct statement is that salt makes the resulting hash different even for the same password, improving resistance to offline cracking at scale and eliminating the "same hash = same password" shortcut attackers rely on.
NEW QUESTION # 41
(What type of encryption uses different keys to encrypt and decrypt the message?)
Answer: C
Explanation:
Asymmetric encryption (also called public key cryptography) uses a pair of mathematically related keys: a public key and a private key. One key is used to encrypt, and the other is used to decrypt, which is the defining "different keys" property asked in the question. In the common confidentiality use case, a sender encrypts a message using the recipient's public key, and only the recipient can decrypt it using their private key. This solves the key distribution problem inherent in symmetric encryption, where both parties must securely share the same secret key in advance. Asymmetric systems also enable digital signatures: the private key signs (creates a signature) and the public key verifies it, providing authenticity and integrity. Symmetric encryption, by contrast, uses the same shared key for both encryption and decryption (even though internal round keys may exist, it is still one shared secret). "Private key" alone is not a full encryption type, and
"secure" is a generic description rather than a cryptographic category. Therefore, the correct answer is D.
Asymmetric.
NEW QUESTION # 42
(What is lattice-based cryptography?)
Answer: B
Explanation:
Lattice-based cryptography refers to cryptographic constructions whose security is based on the computational hardness of problems on mathematical lattices (regular grids of points in high-dimensional space). Examples of hard lattice problems include the Shortest Vector Problem (SVP) and Closest Vector Problem (CVP), and practical schemes often use related problems like Learning With Errors (LWE) or Ring- LWE. These problems are believed to remain hard even for quantum computers, making lattice-based cryptography a major candidate family for post-quantum cryptography. Lattice schemes can support encryption, digital signatures, and key exchange, often with strong security reductions (worst-case to average- case) and efficient implementations. The word "lattice" here is not about simple point encoding; it's about relying on geometric/algebraic structures and noise-based hardness assumptions. It is also unrelated to blockchain "options." While many lattice schemes do involve modular arithmetic internally, what defines the category is the underlying lattice hardness assumptions, not modular arithmetic alone. Therefore, the correct definition is a cryptographic scheme based on geometric lattices.
NEW QUESTION # 43
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