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| Section | Weight | Objectives |
|---|---|---|
| Symmetric Encryption | 25% | - Principles and operation - Algorithms: AES, DES, 3DES, Blowfish - Key generation, distribution, and management challenges - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) |
| Implementation & Best Practices | 5% | - Standards and compliance - Common mistakes and vulnerabilities - Selecting appropriate algorithms and key sizes |
| Hash Functions & Data Integrity | 15% | - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - HMAC construction and application - Uses: integrity checks, password storage, message authentication - Properties: collision resistance, one-way function |
| Cryptography Fundamentals | 20% | - Historical evolution and modern applications - Core goals: confidentiality, integrity, authentication, non-repudiation - Basic terminology: plaintext, ciphertext, algorithm, key |
| Asymmetric Encryption & Public Key Infrastructure | 25% | - PKI components: certificates, CAs, trust models - Digital signatures: purpose and process - Principles: public/private key pairs - Certificate lifecycle: creation, validation, revocation - Algorithms: RSA, ECC, Diffie-Hellman |
| 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 |
>> Introduction-to-Cryptography Reliable Test Answers <<
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NEW QUESTION # 45
(Which operation can be performed on a certificate during the "Issued" stage?)
Answer: D
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 # 46
(What is a characteristic of a hash function?)
Answer: B
Explanation:
A cryptographic hash function maps input data of arbitrary length to a fixed-length digest and is designed to be one-way: given a digest, it should be computationally infeasible to recover the original input (preimage resistance). This one-way property enables many security applications: file integrity checking (any change alters the digest), password storage (combined with salt and slow hashing), digital signatures (signing a digest rather than large data), and commitment schemes. Hash functions are not encryption because they do not support decryption; they intentionally discard information about the input. They also do not use public/private key pairs; those are features of asymmetric cryptography. "Reversible" is the opposite of the intended design goal. A well-designed hash also aims for collision resistance (hard to find two different inputs with the same digest) and second-preimage resistance. Among the answer choices, the defining characteristic that best captures what makes a hash function distinct is that it is one-way.
NEW QUESTION # 47
(What describes how Counter (CTR) mode encryption functions?)
Answer: A
Explanation:
CTR mode turns a block cipher (like AES) into a stream-like construction by generating a keystream from successive encryptions of a changing input block. Specifically, CTR forms input blocks using a nonce (unique per message) combined with an increasing counter. Each nonce||counter block is encrypted with the block cipher under the shared key, producing a pseudorandom output block. That output is then XORed with plaintext to yield ciphertext (and XORed with ciphertext to recover plaintext). This design enables parallelization (blocks can be generated independently), efficient random access decryption, and avoids chaining dependencies seen in modes like CBC. Option B describes CFB-like behavior; option C describes ECB; option D describes CBC. CTR's security critically depends on never reusing the same nonce/counter sequence with the same key, because reuse would repeat keystream blocks and expose plaintext relationships.
Therefore, the correct description is that CTR converts the block cipher into a stream cipher using a counter value and a nonce.
NEW QUESTION # 48
(What is the value of 23 mod 6?)
Answer: B
Explanation:
The expression 23 mod 6 asks for the remainder when 23 is divided by 6. Modular arithmetic is foundational in cryptography, especially in public-key systems (RSA, Diffie-Hellman, ECC) where operations occur in finite rings or fields. To compute 23 mod 6, identify the largest multiple of 6 that does not exceed 23. Multiples of 6 are 6, 12, 18, 24. Since 24 is greater than 23, the largest valid multiple is 18. Subtract: 23 # 18 = 5, so the remainder is 5. Therefore, 23 mod 6 = 5, which corresponds to option
"05." Modular reduction keeps numbers within a fixed range (0 to modulus#1), enabling stable arithmetic under wraparound behavior. In cryptographic protocols, this wraparound property is essential for defining groups and ensuring operations remain bounded and consistent.
NEW QUESTION # 49
(Which authentication method allows a web service installed on a network operating system to prove its identity to a customer?)
Answer: C
Explanation:
One-way server authentication is the standard model used by most TLS-enabled web services to prove the server's identity to a client. In this model, the server presents an X.509 certificate during the TLS handshake.
The client validates the certificate chain to a trusted root CA, checks hostname binding (CN/SAN), validates validity dates, and may check revocation status. If validation succeeds, the client gains cryptographic assurance that it is communicating with the holder of the private key corresponding to the server certificate's public key, and that the certificate is issued to the expected domain/identity. This proves the server's identity to the customer without requiring the customer to present a certificate. Mutual authentication would require both client and server to authenticate each other using certificates (commonly in certain enterprise APIs), but the question asks specifically about the web service proving its identity to the customer, which is satisfied by server-only authentication. One-way client authentication is the opposite direction (client proves identity to server). "End-to-end authentication" is a broader concept and not the specific TLS identity proof mechanism described here. Thus, one-way server authentication is the correct choice.
NEW QUESTION # 50
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