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| Section | Objectives |
|---|---|
| Asymmetric Cryptography | - Diffie-Hellman Key Exchange - RSA Algorithm - Elliptic Curve Cryptography (ECC) - Public Key Infrastructure (PKI) |
| Cryptanalysis and Attacks | - Brute Force and Dictionary Attacks - Common Attack Vectors - Social Engineering Prevention |
| Cryptography Fundamentals | - Symmetric vs Asymmetric Encryption - History and Evolution of Cryptography - Cryptographic Terminology |
| Symmetric Cryptography | - Block Ciphers (AES, DES, 3DES) - Key Management - Stream Ciphers - Initialization Vectors (IV) |
| Hashing and Digital Signatures | - Hash Functions (MD5, SHA-1, SHA-256) - Message Authentication Codes (MAC) - Digital Signature Standards |
| Applied Cryptography | - PGP and Email Encryption - SSL/TLS Protocols - Cryptographic Best Practices - VPN Security |
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NEW QUESTION # 47
(Why should an asymmetric private key be used to encrypt the digest of an application?)
Answer: C
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 # 48
(What is used to randomize the initial value when generating Initialization Vectors (IVs)?)
Answer: C
Explanation:
An IV (Initialization Vector) is a value used to ensure that encrypting identical plaintext under the same key produces different ciphertexts, preventing pattern leakage. In many secure designs, the IV must be unique (and often unpredictable) per encryption operation. A common way to ensure uniqueness is to incorporate a nonce-a "number used once." A nonce can be random, pseudo-random, or a counter-based value depending on the mode and security requirements. For example, CTR mode uses a nonce combined with a counter to produce unique input blocks; GCM uses a nonce/IV to ensure unique authentication and encryption behavior. The encryption key should remain stable across many operations and should not be used as the "randomizer" for IV generation; mixing key material into IV creation in an ad hoc way can create reuse or correlation issues. Plaintext and algorithm do not provide the needed uniqueness property. The nonce concept is specifically about ensuring one-time uniqueness of the starting value so that IV reuse does not repeat keystream blocks (stream modes) or reveal plaintext equality (CBC/CTR). Therefore, the correct choice is Nonce.
NEW QUESTION # 49
(Which type of encryption is Advanced Encryption Standard (AES) considered to be?)
Answer: C
Explanation:
AES is a symmetric-key block cipher, meaning the same shared secret key is used for both encryption and decryption. It operates on fixed-size 128-bit blocks and supports key sizes of 128, 192, and 256 bits. Being symmetric, AES is efficient and well-suited for encrypting large volumes of data-files, disk encryption, VPN payloads, and bulk traffic in protocols like TLS once a session key is established. AES is not "hybrid" by itself; hybrid encryption refers to combining asymmetric cryptography (for key exchange or key wrapping) with symmetric cryptography (for bulk data encryption), and AES often plays the symmetric part of that hybrid design. It is not "quantum encryption," which is a separate, loosely used term sometimes referring to quantum key distribution or quantum-resistant algorithms. AES is also not asymmetric; it does not use public
/private key pairs. Therefore, AES is correctly classified as symmetric encryption, matching option D.
NEW QUESTION # 50
(Which component is used to verify the integrity of a message?)
Answer: C
Explanation:
HMAC (Hash-based Message Authentication Code) is a standard mechanism used to verify both integrity and authenticity of a message when two parties share a secret key. It combines a cryptographic hash function (such as SHA-256) with a secret key in a structured way that resists common attacks on naive keyed-hash constructions. The sender computes an HMAC tag over the message and transmits the message plus tag. The receiver recomputes the HMAC using the same shared secret key and compares the result; if the tag matches, the receiver can be confident the message was not modified in transit and that it came from someone who knows the shared key. AES is an encryption algorithm primarily providing confidentiality; it can provide integrity only when used in authenticated modes (e.g., GCM) but "AES" alone is not the integrity component. An IV helps randomize encryption but does not validate integrity. TKIP is a legacy WLAN protocol component, not the general integrity verifier. Therefore, the correct component for verifying message integrity among the options is HMAC.
NEW QUESTION # 51
(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 # 52
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