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| Section | Weight | Objectives |
|---|---|---|
| Hash Functions & Data Integrity | 15% | - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - Properties: collision resistance, one-way function - Uses: integrity checks, password storage, message authentication - HMAC construction and application |
| Key Management & Secure Protocols | 10% | - Key generation, storage, exchange, and destruction - Secure protocols: TLS/SSL, IPsec, SSH, PGP - Cryptographic attacks: brute force, birthday, man-in-the-middle |
| Symmetric Encryption | 25% | - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) - Key generation, distribution, and management challenges - Principles and operation - Algorithms: AES, DES, 3DES, Blowfish |
| Cryptography Fundamentals | 20% | - Basic terminology: plaintext, ciphertext, algorithm, key - Core goals: confidentiality, integrity, authentication, non-repudiation - Historical evolution and modern applications |
| Implementation & Best Practices | 5% | - Standards and compliance - Common mistakes and vulnerabilities - Selecting appropriate algorithms and key sizes |
| Asymmetric Encryption & Public Key Infrastructure | 25% | - Digital signatures: purpose and process - Certificate lifecycle: creation, validation, revocation - Algorithms: RSA, ECC, Diffie-Hellman - Principles: public/private key pairs - PKI components: certificates, CAs, trust models |
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NEW QUESTION # 63
(What is the correlation between the number of rounds and the key length used in the AES algorithm?)
Answer: D
Explanation:
In AES, the number of rounds is explicitly tied to the key length. AES-128 uses 10 rounds, AES-192 uses 12 rounds, and AES-256 uses 14 rounds. The purpose of additional rounds is to increase diffusion and confusion, strengthening resistance against cryptanalysis as the key schedule and state transformations iterate more times. Although key length primarily affects brute-force resistance, AES's designers and standardization parameters link longer keys with more rounds to maintain security margins across variants, especially considering differences in the key schedule structure. Thus, as key length increases from 128 to 192 to 256 bits, the number of rounds increases correspondingly from 10 to 12 to 14. This relationship is fixed by the AES specification and does not vary dynamically at runtime. Therefore, the correct correlation is that the number of rounds increases as the key length increases.
NEW QUESTION # 64
(Why are large prime numbers important in cryptography?)
Answer: C
Explanation:
Large prime numbers are crucial because they enable cryptosystems where certain operations are easy to perform, but reversing them is computationally hard without secret information. In RSA, security is based on the difficulty of factoring a large composite number that is the product of two large primes; multiplying primes is easy, but factoring the product is believed to be hard at sufficient sizes. In Diffie-Hellman and related systems, primes define finite groups (often modulo a large prime) where exponentiation is efficient but the discrete logarithm problem is hard. Primes also help ensure desirable group properties-such as having a large cyclic subgroup-reducing vulnerabilities from small subgroups or weak structure. The value of "large" is that it makes brute-force and known algorithmic attacks infeasible with current computing resources. Large primes do not primarily make encryption faster, nor do they make decryption easier; they are chosen to maximize security margins. While primes can be involved in encoding steps, their importance is security: they form the mathematical foundation for hardness assumptions used by major public-key algorithms. Therefore, the best answer is that they provide security in encryption algorithms.
NEW QUESTION # 65
(Which of the following is an example of a software encryption solution for disk storage?)
Answer: C
Explanation:
Disk/storage encryption protects data at rest by encrypting the contents of a drive so it remains unreadable without the correct authentication and keys. BitLocker (commonly on Windows) and FileVault (commonly on macOS) are well-known software-based full-disk encryption solutions integrated into their operating systems.
They encrypt sectors on disk and typically tie key protection to user credentials and, where available, hardware features such as a TPM or secure enclave to reduce key extraction risk. A VPN encrypts network traffic in transit, not disk storage. An HSM is specialized hardware used to generate, store, and protect cryptographic keys and perform crypto operations; it is not a disk encryption product itself. USB encryption hardware refers to hardware-encrypted removable media, not a software solution for a system disk. Therefore, the correct example of a software encryption solution for disk storage is BitLocker and FileVault.
NEW QUESTION # 66
(What is an alternative to using a Certificate Revocation List (CRL) with certificates?)
Answer: C
Explanation:
OCSP is the primary online alternative to CRLs for checking whether a certificate has been revoked.
With a CRL, a relying party periodically downloads a list of revoked certificate serial numbers published by the issuing CA (or CRL distribution point). That approach can be bandwidth-heavy, introduces latency between revocation and client awareness, and can result in clients using stale revocation data if updates are infrequent. OCSP improves this by allowing a client (or a server on the client's behalf) to query an OCSP responder in near real time about the status of a specific certificate (good, revoked, or unknown). In practice, many TLS deployments use OCSP stapling, where the server periodically fetches a signed OCSP response from the CA's responder and "staples" it to the TLS handshake, reducing client-side network calls and improving privacy (the CA doesn't learn which site the client is visiting). Thus, OCSP provides a more timely, certificate-specific revocation status mechanism than CRLs while preserving the CA's signed assurance.
NEW QUESTION # 67
(An organization wants to digitally sign its software to guarantee the integrity of its source code. Which key should the customer use to decrypt the digest of the source code?)
Answer: B
Explanation:
When software is digitally signed, the organization computes a cryptographic hash (digest) of the software (or its manifest) and then signs that digest using the organization's private key. Verification works in the opposite direction: the customer (verifier) uses the organization's public key to validate the signature and recover
/confirm the signed digest, then independently hashes the received software and compares the result. If the digests match and the signature validates under the public key, the customer has strong assurance that the software has not been altered since it was signed and that it was signed by the holder of the corresponding private key. The customer never needs the organization's private key-sharing it would destroy security and enable forgery. Likewise, the customer's own keys are irrelevant to verifying the publisher's signature. The organization's public key is typically delivered inside a certificate chain (code signing certificate) so the verifier can also validate publisher identity and trust. Therefore, the customer uses the organization's public key for signature verification (often described as "decrypting" the signed digest).
NEW QUESTION # 68
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