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| Section | Objectives |
|---|---|
| Cryptography Fundamentals | - History and Evolution of Cryptography - Cryptographic Terminology - Symmetric vs Asymmetric Encryption |
| Symmetric Cryptography | - Key Management - Block Ciphers (AES, DES, 3DES) - Initialization Vectors (IV) - Stream Ciphers |
| Hashing and Digital Signatures | - Message Authentication Codes (MAC) - Digital Signature Standards - Hash Functions (MD5, SHA-1, SHA-256) |
| Applied Cryptography | - SSL/TLS Protocols - PGP and Email Encryption - Cryptographic Best Practices - VPN Security |
| Asymmetric Cryptography | - RSA Algorithm - Elliptic Curve Cryptography (ECC) - Diffie-Hellman Key Exchange - Public Key Infrastructure (PKI) |
| Cryptanalysis and Attacks | - Common Attack Vectors - Social Engineering Prevention - Brute Force and Dictionary Attacks |
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NEW QUESTION # 88
(Which feature is characteristic of asymmetric encryption?)
Answer: A
Explanation:
Asymmetric encryption is defined by using a key pair: a public key that can be shared widely and a private key that remains secret to its owner. The keys are mathematically related so that data encrypted with one key can be decrypted with the other (in confidentiality use cases, encryption with the recipient's public key and decryption with the recipient's private key). This design solves key distribution challenges: anyone can encrypt to a recipient without first sharing a secret key securely. It also enables digital signatures, where the private key signs and the public key verifies-supporting authenticity and integrity. Option B describes symmetric cryptography, not asymmetric. Option C is not a defining property; both symmetric and asymmetric algorithms can involve rounds or repeated operations. Option D is incorrect because asymmetric encryption is reversible for the intended holder of the private key; "irreversible" describes hashing, not encryption. Therefore, the characteristic feature of asymmetric encryption is the use of both a public and private key.
NEW QUESTION # 89
(How does adding salt to a password improve security?)
Answer: A
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 # 90
(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 # 91
(A company wants to use certificates issued by a root CA to demonstrate to customers that it is a legitimate company being hosted by a cloud provider. Who needs to trust the root CA public key?)
Answer: D
NEW QUESTION # 92
(Which cipher uses shifting letters of the alphabet for encryption?)
Answer: A
Explanation:
The Caesar cipher is the classic substitution cipher that encrypts by shifting letters of the alphabet by a fixed number of positions (e.g., shift by 3: A#D, B#E, etc.). It is a monoalphabetic cipher because a single shift value is applied uniformly across the entire message, making it simple and vulnerable to frequency analysis and brute force (only 25 meaningful shifts in the Latin alphabet). Vigenere also involves shifting, but it uses a repeating keyword to vary the shift per character (polyalphabetic), whereas the question's phrasing typically points to the fundamental "shift cipher," which is Caesar.
SHA-1 is a cryptographic hash function, not a cipher. Bifid is a fractionation cipher combining Polybius square coordinates and transposition, not a direct shifting method. Therefore, the cipher that uses shifting letters of the alphabet for encryption is the Caesar cipher.
NEW QUESTION # 93
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