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| Section | Objectives |
|---|---|
| Topic 1: Foundations of Cryptography | - Core concepts of confidentiality, integrity, authentication, non-repudiation - Historical and modern cryptography principles |
| Topic 2: Asymmetric Encryption | - RSA and ECC fundamentals - Public key cryptography principles |
| Topic 3: Hash Functions and Message Authentication | - MAC and HMAC mechanisms - Cryptographic hash functions (e.g., SHA family concepts) |
| Topic 4: Symmetric Encryption | - Block and stream ciphers - AES and legacy algorithms (e.g., DES conceptually) |
| Topic 5: Cryptographic Protocols and Applications | - TLS/SSL conceptual overview - Secure communication design principles |
| Topic 6: Key Management and PKI | - Key exchange and lifecycle management - Certificates, certificate authorities, and PKI structure |
>> Introduction-to-Cryptography Actual Test Answers <<
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NEW QUESTION # 20
(How does adding salt to a password improve security?)
Answer: D
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 # 21
(Which is a primary reason for ethical concerns about encryption?)
Answer: D
Explanation:
Ethical concerns about encryption commonly arise from the tension between individual privacy/security and societal needs such as law enforcement, national security, and public safety. Strong end-to-end encryption can prevent unauthorized parties from accessing data, including criminals and foreign adversaries, but it can also limit legitimate government access to communications and evidence-even with warrants-because providers may not possess the keys needed to decrypt. This has fueled debates around "going dark," lawful access, and proposals for exceptional access mechanisms or backdoors. Critics argue that weakening encryption for access would create systemic risk, since any intentional vulnerability can be exploited by malicious actors, while proponents emphasize investigative needs in serious cases. Regardless of the stance, the primary ethical concern reflected in policy debates is that encryption complicates government access to information that may be crucial for preventing or investigating crime. The other options do not capture the main ethical controversy: encryption is widely beneficial beyond corporations, and it is not primarily about speed or storage reduction. Therefore, the correct answer is B.
NEW QUESTION # 22
(What is modular arithmetic in cryptography?)
Answer: D
Explanation:
Modular arithmetic is the mathematics of working with remainders after division by a fixed number called the modulus. In cryptography, it underpins many core constructions because it defines arithmetic in finite sets (rings and fields) where values "wrap around," enabling stable, repeatable operations with bounded results.
Public-key systems like RSA rely on modular exponentiation (raising integers to powers modulo a composite number), while Diffie-Hellman and many elliptic-curve schemes operate in groups defined by modular arithmetic properties. Encryption and key exchange use modular operations because they allow efficient computation forward (e.g., exponentiation modulo a large number) while making certain inverse problems computationally hard without secret information (e.g., factoring or discrete logarithms). Modular reduction also helps keep intermediate values manageable and supports group properties needed for proofs of security.
Although modular arithmetic is not "encryption by itself," it is a foundational method used inside encryption algorithms and protocols. Therefore, among the options, describing it as a method used for encryption via modular operations best matches cryptographic usage.
NEW QUESTION # 23
(Which default port must be allowed by firewalls for the key exchange of the IPsec handshaking process to be successful?)
Answer: C
Explanation:
IPsec's initial key exchange is commonly performed using IKE (Internet Key Exchange), which negotiates Security Associations (SAs), authenticates peers, and establishes shared keys for ESP/AH protection. The traditional and default transport for IKEv1 and IKEv2 is UDP port 500. During negotiation, peers exchange proposals (crypto suites), perform Diffie-Hellman to derive key material, and authenticate using pre-shared keys, certificates, or EAP methods. If a firewall blocks UDP 500, the IKE negotiation cannot begin, preventing IPsec tunnels from forming. In many real deployments, NAT traversal is also used; in that case, traffic typically shifts to UDP 4500 (NAT-T) after detection of NAT, but UDP 500 is still required for the initial exchange and NAT detection in many configurations. TCP
500 is not standard for IKE. Port 443 is associated with HTTPS/TLS and some SSL VPNs, not IPsec IKE. Therefore, among the options provided, the firewall must allow UDP 500 for IPsec key exchange to succeed.
NEW QUESTION # 24
(Which encryption algorithm uses an 80-bit key and operates on 64-bit data blocks?)
Answer: C
Explanation:
Skipjack is a symmetric block cipher historically associated with the Clipper chip initiative. Its defining parameters match the question: it operates on 64-bit blocks and uses an 80-bit key. The other options do not fit those exact sizes. Twofish is a 128-bit block cipher with key sizes up to 256 bits. Blowfish is a
64-bit block cipher, but its key size is variable from 32 up to 448 bits and is not fixed at 80 bits as a defining property. Camellia is a 128-bit block cipher with key sizes of 128, 192, or 256 bits. Skipjack's smaller key size and legacy design make it unsuitable for modern security needs, but the question is purely about identifying the algorithm that matches an 80-bit key and 64-bit blocks. Therefore, the correct answer is Skipjack.
NEW QUESTION # 25
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