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| Section | Objectives |
|---|---|
| Symmetric Cryptography | - Stream Ciphers - Initialization Vectors (IV) - Block Ciphers (AES, DES, 3DES) - Key Management |
| Cryptanalysis and Attacks | - Common Attack Vectors - Social Engineering Prevention - Brute Force and Dictionary Attacks |
| Hashing and Digital Signatures | - Digital Signature Standards - Hash Functions (MD5, SHA-1, SHA-256) - Message Authentication Codes (MAC) |
| Asymmetric Cryptography | - Elliptic Curve Cryptography (ECC) - Public Key Infrastructure (PKI) - RSA Algorithm - Diffie-Hellman Key Exchange |
| Cryptography Fundamentals | - Cryptographic Terminology - History and Evolution of Cryptography - Symmetric vs Asymmetric Encryption |
| Applied Cryptography | - PGP and Email Encryption - Cryptographic Best Practices - VPN Security - SSL/TLS Protocols |
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NEW QUESTION # 13
(What is a component of a one-time password (OTP) that is needed to guess future iterations of passwords?)
Answer: A
Explanation:
OTP systems (such as HOTP and TOTP) generate a sequence of passwords using a shared secret and a moving factor (counter or time). The critical secret that underpins the ability to compute past or future OTP values is the seed (also called the shared secret key). In HOTP, the seed is used with an HMAC function and an incrementing counter; in TOTP, the seed is used with HMAC and a time-step value. If an attacker obtains the seed and knows the algorithm and moving factor, they can compute future OTPs. The "function" and "encryption algorithm" are typically standardized and public; security relies on keeping the seed secret. An initialization vector is not a standard OTP component in HOTP
/TOTP generation. Therefore, the component needed to predict future OTP values is the seed.
Protecting the seed is essential: it should be stored securely (e.g., hardware token secure storage) and transmitted only through controlled provisioning processes. If compromised, OTP becomes predictable and no longer serves as a strong second factor.
NEW QUESTION # 14
(Two people want to communicate through secure email. The person creating the email wants to ensure only their friend can decrypt the email. Which key should the person creating the email use to encrypt the message?)
Answer: A
Explanation:
To ensure confidentiality so that only the intended recipient can decrypt an email, the sender must encrypt in a way that only the recipient can reverse. In public key cryptography, that means encrypting with the recipient's public key. The recipient is the only party who should possess the matching private key, so only they can decrypt the ciphertext. This pattern is fundamental to PKI-based secure email systems such as S/MIME and OpenPGP: the sender looks up or is provided the recipient's certificate/public key, encrypts the message (often by encrypting a randomly generated symmetric session key with the recipient's public key), and the recipient uses their private key to recover the session key and decrypt the content. Encrypting with the sender' s private key would not provide confidentiality; it resembles signing because anyone with the sender's public key could "decrypt" it. Encrypting with a private key of the recipient is also incorrect because private keys are not shared and should never leave the recipient's control. Therefore, the correct key to encrypt the message so only the friend can decrypt it is the recipient's public key.
NEW QUESTION # 15
(What describes a true random number generator?)
Answer: C
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 # 16
(Which operation can be performed on a certificate during the "Issued" stage?)
Answer: C
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 # 17
(What are the roles of keys when using digital signatures?)
Answer: C
Explanation:
Digital signatures provide integrity, authenticity, and typically non-repudiation by using an asymmetric key pair. The signer uses the private key to create a signature over a message (usually over a hash/digest of the message). Because the private key is kept secret, only the legitimate signer should be able to produce a valid signature. Anyone who has the corresponding public key can then validate the signature: they verify that the signature matches the message digest under the public key and that the signed data has not been altered. This is why the public key can be widely distributed (often inside an X.509 certificate) while the private key must be protected by the signer. If a public key were used to sign, anyone could forge signatures; if a private key were required for validation, only the signer could validate, defeating the purpose of public verifiability.
Therefore, the correct key roles are private key for signing and public key for signature validation.
NEW QUESTION # 18
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