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| Section | Objectives |
|---|---|
| Applied Cryptography | - Cryptographic Best Practices - VPN Security - PGP and Email Encryption - SSL/TLS Protocols |
| Symmetric Cryptography | - Initialization Vectors (IV) - Key Management - Block Ciphers (AES, DES, 3DES) - Stream Ciphers |
| Hashing and Digital Signatures | - Message Authentication Codes (MAC) - Digital Signature Standards - Hash Functions (MD5, SHA-1, SHA-256) |
| Cryptography Fundamentals | - Cryptographic Terminology - Symmetric vs Asymmetric Encryption - History and Evolution of Cryptography |
| Cryptanalysis and Attacks | - Social Engineering Prevention - Brute Force and Dictionary Attacks - Common Attack Vectors |
| Asymmetric Cryptography | - Public Key Infrastructure (PKI) - RSA Algorithm - Diffie-Hellman Key Exchange - Elliptic Curve Cryptography (ECC) |
>> Actual Introduction-to-Cryptography Test Answers <<
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NEW QUESTION # 82
(Which encryption mode is known for supporting parallel processing?)
Answer: D
Explanation:
ECB (Electronic Codebook) mode encrypts each block independently with the same key, which makes it naturally amenable to parallel processing: multiple blocks can be encrypted or decrypted simultaneously because there is no chaining dependency between blocks. This is in contrast to CBC encryption, where each plaintext block is XORed with the previous ciphertext block, creating a dependency that prevents straightforward parallelization of encryption (though CBC decryption can be parallelized because ciphertext blocks are already known). Feedback modes like CFB and OFB generate keystream material sequentially, where each step depends on the previous state, limiting parallelism. While ECB's parallelism is an implementation advantage, it is widely discouraged for most real data because it leaks patterns-identical plaintext blocks produce identical ciphertext blocks. Modern systems prefer parallel-friendly and secure modes such as CTR or GCM, but among the listed options, the mode most known for parallel processing is ECB due to block independence. Therefore, the correct answer is Electronic Codebook (ECB).
NEW QUESTION # 83
(Why should an administrator choose lightweight cryptography?)
Answer: B
Explanation:
Lightweight cryptography is designed for constrained environments-devices with limited CPU, memory, storage, bandwidth, and power (battery). Examples include IoT sensors, smart locks, RFID tags, embedded controllers, and industrial devices. Administrators choose lightweight algorithms and protocols to maintain reasonable security while fitting strict resource budgets and real-time constraints. The goal is not "weaker security because data is unimportant," but rather efficient security that can still meet threat models under constraints. Option B captures this: embedded systems often cannot afford the computational cost of heavy cryptographic primitives (large key sizes, complex modes, frequent handshakes) or may struggle with latency and energy consumption. Option A is irrelevant because physical security of a desktop doesn't remove the need for cryptography in communications or storage. Option C is the opposite of lightweight design. Option D is a poor justification; security design should be based on risk, and lightweight cryptography is not merely for
"minimal protection," but for practical deployability under constraints. Therefore, the correct reason is limited resources on embedded systems.
NEW QUESTION # 84
(What are the roles of keys when using digital signatures?)
Answer: D
NEW QUESTION # 85
(Which of the following best describes lightweight cryptography?)
Answer: B
Explanation:
Lightweight cryptography refers to cryptographic primitives and profiles engineered for environments where computational resources are constrained-limited CPU, memory, power, bandwidth, and code size-while still requiring robust security. Typical targets include IoT sensors, embedded controllers, smart cards, RFID, wearables, and many mobile or edge deployments. The design goals emphasize efficiency (low energy consumption, small silicon area for hardware, small firmware footprint) and practical performance under constraints, often while providing modern security properties like authenticated encryption (confidentiality + integrity) and secure hashing. Lightweight cryptography is not simply "stronger encryption"; it balances security with implementability in constrained systems. It is also not restricted to military settings and is not inherently outdated-many lightweight designs are modern and motivated by the rapid growth of IoT and pervasive computing. Because constrained devices are common entry points for attackers, having secure primitives that fit those devices is a critical part of contemporary security architecture. Therefore, the best description is cryptographic algorithms designed for resource-constrained environments.
NEW QUESTION # 86
(How does a cryptographic policy contribute to incident response?)
Answer: D
Explanation:
A cryptographic policy defines how encryption, keys, certificates, and integrity mechanisms are used and managed across an organization. During incident response, that policy becomes a playbook for making safe, consistent decisions under pressure. It can specify how to rotate or revoke compromised keys, how to validate and reissue certificates, how to preserve evidence integrity with hashing, and how to securely communicate sensitive incident details (e.g., using approved encrypted channels). It can also define backup encryption requirements and key escrow or recovery procedures, enabling secure data recovery without exposing protected data. Policies typically outline roles and responsibilities (who can access keys, who can approve rekeying), logging requirements, and escalation steps-reducing confusion and preventing ad hoc crypto changes that might worsen exposure. The goal is not to limit encryption; it is to ensure cryptography is used correctly to contain and remediate incidents. Therefore, providing guidelines for secure recovery and communication is the correct contribution of cryptographic policy to incident response.
NEW QUESTION # 87
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