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| Section | Objectives |
|---|---|
| Symmetric Cryptography | - Key Management - Stream Ciphers - Block Ciphers (AES, DES, 3DES) - Initialization Vectors (IV) |
| Cryptography Fundamentals | - Symmetric vs Asymmetric Encryption - Cryptographic Terminology - History and Evolution of Cryptography |
| Applied Cryptography | - VPN Security - SSL/TLS Protocols - Cryptographic Best Practices - PGP and Email Encryption |
| Asymmetric Cryptography | - Elliptic Curve Cryptography (ECC) - Public Key Infrastructure (PKI) - RSA Algorithm - Diffie-Hellman Key Exchange |
| Cryptanalysis and Attacks | - Social Engineering Prevention - Brute Force and Dictionary Attacks - Common Attack Vectors |
| Hashing and Digital Signatures | - Hash Functions (MD5, SHA-1, SHA-256) - Message Authentication Codes (MAC) - Digital Signature Standards |
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NEW QUESTION # 45
(Which encryption mode is known for supporting parallel processing?)
Answer: C
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 # 46
(What does nonrepudiation aim to achieve in the context of cryptography?)
Answer: B
Explanation:
Nonrepudiation aims to prevent a party from later denying having performed an action, such as sending a message, approving a transaction, or signing a document. In cryptographic systems, nonrepudiation is typically supported by digital signatures, audit logs, and trusted time-stamping: if a message is signed with a private key and verified with the corresponding public key (often bound to an identity via a certificate), the signer can be held accountable for that signed content. This creates evidence that can be used for dispute resolution, compliance, and legal or contractual enforcement. Nonrepudiation is distinct from confidentiality (keeping data secret) and from access control (preventing unauthorized use). While authentication (verifying identity) is related and often a prerequisite, the defining goal is accountability-ensuring that actions can be attributed to entities in a way that is difficult to dispute later. Effective nonrepudiation also depends on secure private key management, certificate validation, and procedures that show the key was under the signer's control at the time. Therefore, the correct answer is holding parties accountable for their actions and transactions.
NEW QUESTION # 47
(Which cipher uses shifting letters of the alphabet for encryption?)
Answer: D
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 # 48
(Which operation can be performed on a certificate during the "Issued" stage?)
Answer: B
Explanation:
The "Issued" stage in a certificate lifecycle indicates that the certificate has been generated and signed by the issuing CA and is now valid for use (subject to validity dates, policy constraints, and revocation status). At this point, the operational focus shifts from creating the certificate to making it available to the subject and relying parties. "Distribution" is the lifecycle activity most directly associated with an issued certificate: installing it on servers or endpoints, provisioning it into keystores, publishing it to directories if required, and ensuring the chain (intermediates) is accessible for validation. By contrast,
"Creation" is earlier in the process (key generation, CSR creation, identity validation, issuance
/signing). "Key recovery" and "key archiving" relate to private key management and escrow policies (often for encryption keys, not signing keys), and are governed by organizational policy and key management systems rather than the certificate's issued state itself. A certificate can be distributed after issuance regardless of whether any key escrow features exist. Therefore, the operation that fits the certificate's "Issued" stage best is distribution of the issued credential for operational use.
NEW QUESTION # 49
(What describes a true random number generator?)
Answer: A
Explanation:
A true random number generator (TRNG) draws randomness from physical phenomena that are inherently unpredictable and not algorithmically reproducible. Because of this, it is nondeterministic: you cannot feed it the same "input" and expect the same output stream. TRNGs are often slower than PRNGs because they depend on collecting entropy from hardware sources and may require conditioning to remove bias. This aligns with option B: slow and nondeterministic, producing different results even under similar or repeated conditions. Option A describes a deterministic PRNG, where identical seeds yield identical sequences. Option C is unrelated; factorization is a hard math problem used in cryptography (e.g., RSA security assumptions), not a randomness generator definition. Option D describes a counter, which is deterministic and not random.
In secure systems, TRNG output may seed a cryptographically secure PRNG to provide both unpredictability and high throughput; but the defining characteristic of a TRNG is nondeterminism from physical entropy.
Therefore, option B is correct.
NEW QUESTION # 50
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