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| Section | Objectives |
|---|---|
| Cryptography Fundamentals | - Cryptographic Terminology - Symmetric vs Asymmetric Encryption - History and Evolution of Cryptography |
| Applied Cryptography | - PGP and Email Encryption - Cryptographic Best Practices - SSL/TLS Protocols - VPN Security |
| Symmetric Cryptography | - Stream Ciphers - Key Management - Block Ciphers (AES, DES, 3DES) - Initialization Vectors (IV) |
| Asymmetric Cryptography | - Diffie-Hellman Key Exchange - RSA Algorithm - Elliptic Curve Cryptography (ECC) - Public Key Infrastructure (PKI) |
| Hashing and Digital Signatures | - Hash Functions (MD5, SHA-1, SHA-256) - Message Authentication Codes (MAC) - Digital Signature Standards |
| Cryptanalysis and Attacks | - Brute Force and Dictionary Attacks - Social Engineering Prevention - Common Attack Vectors |
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NEW QUESTION # 61
(Which cryptographic technique is used to ensure data integrity?)
Answer: C
Explanation:
Data integrity means ensuring that information has not been modified without authorization. Digital signatures are a core cryptographic technique that provides integrity by binding a message (typically its hash) to the signer's private key. The signer creates a signature over the message digest; the verifier checks it with the signer's public key and recomputes the digest. Any change to the message alters the digest and causes verification to fail, revealing tampering. Digital signatures also support authenticity (verifying the signer) and can contribute to nonrepudiation under proper key-management and policy controls, but integrity is a primary guarantee they deliver. "Authentication" is broader and can be achieved by other means, but it is not as directly tied to integrity as signatures in this option set. "Non-repudiation" is an outcome/goal rather than a standalone integrity technique. "Steganography" hides the existence of data and does not inherently protect integrity. Therefore, among these options, digital signatures are the best cryptographic technique for ensuring data integrity.
NEW QUESTION # 62
(How does a cryptographic policy contribute to incident response?)
Answer: C
Explanation:
A cryptographic policy defines how encryption, keys, certificates, and integrity mechanisms are used and managed across an organization. During incident response, that policy becomes a playbook for making safe, consistent decisions under pressure. It can specify how to rotate or revoke compromised keys, how to validate and reissue certificates, how to preserve evidence integrity with hashing, and how to securely communicate sensitive incident details (e.g., using approved encrypted channels). It can also define backup encryption requirements and key escrow or recovery procedures, enabling secure data recovery without exposing protected data. Policies typically outline roles and responsibilities (who can access keys, who can approve rekeying), logging requirements, and escalation steps-reducing confusion and preventing ad hoc crypto changes that might worsen exposure. The goal is not to limit encryption; it is to ensure cryptography is used correctly to contain and remediate incidents. Therefore, providing guidelines for secure recovery and communication is the correct contribution of cryptographic policy to incident response.
NEW QUESTION # 63
(Which operation can be performed on a certificate during the "Issued" stage?)
Answer: A
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 # 64
(Which number generator has different results given the same input data?)
Answer: A
Explanation:
A true random number generator (TRNG) produces outputs derived from nondeterministic physical processes (e.g., thermal noise, oscillator jitter, radioactive decay, or other hardware entropy sources).
Because the underlying phenomenon is not algorithmically determined by an input seed in the same way as a PRNG, repeated "inputs" (or identical conditions from a software perspective) do not yield the same sequence; the outputs vary unpredictably. By contrast, a pseudorandom number generator (PRNG) is deterministic: given the same seed and internal state, it produces the same output sequence, which is useful for repeatability but means security depends on seed secrecy and proper seeding.
"Prime" is not a generator type, and "sequence" is too generic and does not imply nondeterminism. In cryptographic systems, TRNGs (or hardware entropy sources) are often used to seed cryptographically secure PRNGs (CSPRNGs), combining high-quality entropy with efficient generation. Therefore, the generator that can produce different results for the "same input data" is a true random number generator.
NEW QUESTION # 65
(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: C
NEW QUESTION # 66
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