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| Section | Objectives |
|---|---|
| Cryptanalysis and Attacks | - Social Engineering Prevention - Common Attack Vectors - Brute Force and Dictionary Attacks |
| Applied Cryptography | - Cryptographic Best Practices - VPN Security - PGP and Email Encryption - SSL/TLS Protocols |
| Hashing and Digital Signatures | - Digital Signature Standards - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) |
| Asymmetric Cryptography | - Diffie-Hellman Key Exchange - RSA Algorithm - Public Key Infrastructure (PKI) - Elliptic Curve Cryptography (ECC) |
| Symmetric Cryptography | - Key Management - Initialization Vectors (IV) - Stream Ciphers - Block Ciphers (AES, DES, 3DES) |
| Cryptography Fundamentals | - History and Evolution of Cryptography - Symmetric vs Asymmetric Encryption - Cryptographic Terminology |
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NEW QUESTION # 64
(What is a characteristic of a hash function?)
Answer: B
Explanation:
A cryptographic hash function maps input data of arbitrary length to a fixed-length digest and is designed to be one-way: given a digest, it should be computationally infeasible to recover the original input (preimage resistance). This one-way property enables many security applications: file integrity checking (any change alters the digest), password storage (combined with salt and slow hashing), digital signatures (signing a digest rather than large data), and commitment schemes. Hash functions are not encryption because they do not support decryption; they intentionally discard information about the input. They also do not use public/private key pairs; those are features of asymmetric cryptography. "Reversible" is the opposite of the intended design goal. A well-designed hash also aims for collision resistance (hard to find two different inputs with the same digest) and second-preimage resistance. Among the answer choices, the defining characteristic that best captures what makes a hash function distinct is that it is one-way.
NEW QUESTION # 65
(Why should an asymmetric private key be used to encrypt the digest of an application?)
Answer: A
Explanation:
Digital signing of software typically works by hashing the application (or its manifest) and then using the publisher's private key to create a digital signature over that digest. The private key is used because it is secret and uniquely controlled by the publisher; only the publisher should be able to produce a valid signature.
Verifiers (customers) use the publisher's public key to validate the signature and confirm that the digest matches the software they received. This yields two key properties: integrity (the software hasn't been altered; any modification changes the digest and breaks verification) and authenticity (the signature proves it came from the private-key holder). Option A incorrectly describes symmetric stream encryption. Option C incorrectly generalizes private-key behavior as "block encryption." Option D is wrong because verification uses the public key, not a private key; also, "encrypting with private key" in this context is better understood as signing, not confidentiality encryption. Therefore, the correct rationale is that the asymmetric private key is used to sign the file's digest so the corresponding public key can verify integrity and authenticity.
NEW QUESTION # 66
(What is the significance of the Nobody But Us (NOBUS) principle in cryptography?)
Answer: D
Explanation:
The NOBUS (Nobody But Us) principle is a controversial security notion suggesting that it is possible to introduce or maintain an access capability (often framed as a "backdoor" or exploitable weakness) that is effectively usable only by the party that designed it-typically a government or specific organization-while remaining infeasible for everyone else to exploit. In practice, NOBUS is invoked in debates about lawful access, surveillance, and exceptional access mechanisms: proponents claim that sophisticated entities can keep exploitation techniques secret and complex enough that adversaries cannot replicate them. Critics argue that this assumption is fragile because vulnerabilities can be independently discovered, reverse engineered, leaked, or eventually exploited as tools and knowledge spread. Moreover, once a weakness exists, it becomes a systemic risk: software and cryptographic systems are widely deployed and adversaries can invest heavily in finding and weaponizing the same flaw. Modern security engineering generally favors eliminating known weaknesses rather than relying on secrecy or assumed asymmetry of capability. Therefore, the best description of NOBUS is that a vulnerability is believed to be so difficult to exploit that only its creator can exploit it.
NEW QUESTION # 67
(Why is lightweight cryptography important in modern information security?)
Answer: A
Explanation:
Lightweight cryptography is important because many modern systems operate in constrained environments- IoT sensors, embedded controllers, wearables, and mobile devices-where CPU, memory, storage, bandwidth, and battery power are limited. Traditional "heavy" cryptographic suites may be too slow, too energy-intensive, or too large in code footprint for these platforms, leading to insecure workarounds or disabling security entirely. Lightweight cryptographic primitives and profiles are designed to deliver strong security properties (confidentiality and integrity, often via AEAD) while fitting within tight resource budgets and real-time constraints. This is essential as IoT and mobile ecosystems expand, increasing the attack surface and the consequences of compromised devices (botnets, surveillance, physical safety risks). Lightweight cryptography is not meant to "limit encryption tools" or complicate protection; it enables practical, deployable security where otherwise implementations might be weak or absent. High-speed network communication can benefit from efficient crypto too, but the defining modern driver is constrained-device security. Therefore, the correct reason is addressing the security needs of IoT devices and mobile applications.
NEW QUESTION # 68
(An administrator has configured a Virtual Private Network (VPN) connection utilizing IPsec transport mode with Encapsulating Security Payload (ESP) between a server in the corporate office and a client computer in the remote office. In which situation can the packet content be inspected?)
Answer: B
Explanation:
With IPsec ESP in transport mode, the payload of the original IP packet (typically the transport-layer segment and higher) is encrypted and integrity-protected between the two endpoints-here, the corporate server and the remote client. Because encryption is applied by the sending endpoint and removed only by the receiving endpoint, intermediate routers, switches, and monitoring devices in either network cannot view the protected payload while it is in transit. They may see outer IP headers and certain metadata needed for routing, but not the encrypted content protected by ESP. As a result, the packet's contents are inspectable only at the endpoints: before encryption on the sender (plaintext exists in memory/stack before IPsec processing) and after decryption on the receiver (plaintext is restored for the application). This is true whether the traffic traverses internal networks or the Internet; the cryptographic boundary is between the endpoints participating in the IPsec SA. Therefore, inspection of the actual content is possible only on the devices at headquarters and offsite, before sending and after receiving, not by in-transit networks.
NEW QUESTION # 69
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