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| Section | Objectives |
|---|---|
| Applied Cryptography | - VPN Security - SSL/TLS Protocols - Cryptographic Best Practices - PGP and Email Encryption |
| Symmetric Cryptography | - Block Ciphers (AES, DES, 3DES) - Stream Ciphers - Initialization Vectors (IV) - Key Management |
| Asymmetric Cryptography | - Public Key Infrastructure (PKI) - Diffie-Hellman Key Exchange - Elliptic Curve Cryptography (ECC) - RSA Algorithm |
| Cryptography Fundamentals | - History and Evolution of Cryptography - Cryptographic Terminology - Symmetric vs Asymmetric Encryption |
| Hashing and Digital Signatures | - Hash Functions (MD5, SHA-1, SHA-256) - Message Authentication Codes (MAC) - Digital Signature Standards |
| Cryptanalysis and Attacks | - Social Engineering Prevention - Common Attack Vectors - Brute Force and Dictionary Attacks |
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NEW QUESTION # 77
(What is the significance of the Nobody But Us (NOBUS) principle in cryptography?)
Answer: B
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 # 78
(What is modular arithmetic in cryptography?)
Answer: B
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 # 79
(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 # 80
(Why did the National Institute of Standards and Technology (NIST) choose Ascon for lightweight cryptography?)
Answer: D
Explanation:
NIST's lightweight cryptography effort targets environments like IoT and embedded systems where CPU, memory, energy, and bandwidth are constrained, yet strong security is still required. Ascon is an authenticated encryption with associated data (AEAD) family designed to be efficient in both hardware and software with small footprint, making it well-suited for constrained devices. NIST selected Ascon because it offers a strong security design with good performance and implementability under tight resource budgets, while providing modern protections (confidentiality + integrity) through AEAD. That aligns with option C: secure and efficient encryption for resource-constrained devices. The selection was not primarily about authenticating users (that is typically handled by protocols and identity systems, not an AEAD primitive). It was also not mainly about legacy compatibility; lightweight cryptography aims at new and constrained deployments rather than preserving outdated stacks. And while Ascon can certainly be used to protect data at rest, that is only one application; the core reason for the choice is its suitability for constrained environments and robust, efficient authenticated encryption.
NEW QUESTION # 81
(Which mechanism implemented in WPA-Enterprise guards against bit-flipping exploits?)
Answer: A
Explanation:
Bit-flipping exploits target encryption modes or protocols that do not provide strong integrity, allowing attackers to modify ciphertext so that predictable changes occur in plaintext after decryption. To defend against this, protocols add an integrity mechanism that detects tampering. In WPA (including enterprise deployments), TKIP introduced a Message Integrity Check (MIC) called "Michael." The MIC is computed over the frame contents (with additional fields) and verified by the receiver; if an attacker flips bits in transit, the MIC verification fails, and the frame is rejected. While AES (used by WPA2's CCMP) also provides integrity via authenticated encryption, the option presented that directly names the tamper-detection mechanism associated with guarding against bit-flipping is MIC. A pre- shared key is an authentication/keying method (and not enterprise-mode anyway), and a "global encryption key" would be the opposite of what you want-global/static keys worsen security.
Therefore, the intended mechanism that mitigates bit-flipping by detecting unauthorized modifications is the Message Integrity Check.
NEW QUESTION # 82
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