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| Section | Objectives |
|---|---|
| Applied Cryptography | - SSL/TLS Protocols - VPN Security - PGP and Email Encryption - Cryptographic Best Practices |
| Cryptanalysis and Attacks | - Brute Force and Dictionary Attacks - Social Engineering Prevention - Common Attack Vectors |
| Symmetric Cryptography | - Stream Ciphers - Key Management - Initialization Vectors (IV) - Block Ciphers (AES, DES, 3DES) |
| Asymmetric Cryptography | - RSA Algorithm - Elliptic Curve Cryptography (ECC) - Diffie-Hellman Key Exchange - Public Key Infrastructure (PKI) |
| Hashing and Digital Signatures | - Digital Signature Standards - Hash Functions (MD5, SHA-1, SHA-256) - Message Authentication Codes (MAC) |
| Cryptography Fundamentals | - Cryptographic Terminology - History and Evolution of Cryptography - Symmetric vs Asymmetric Encryption |
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NEW QUESTION # 78
(Which component is used to verify the integrity of a message?)
Answer: A
Explanation:
HMAC (Hash-based Message Authentication Code) is a standard mechanism used to verify both integrity and authenticity of a message when two parties share a secret key. It combines a cryptographic hash function (such as SHA-256) with a secret key in a structured way that resists common attacks on naive keyed-hash constructions. The sender computes an HMAC tag over the message and transmits the message plus tag. The receiver recomputes the HMAC using the same shared secret key and compares the result; if the tag matches, the receiver can be confident the message was not modified in transit and that it came from someone who knows the shared key. AES is an encryption algorithm primarily providing confidentiality; it can provide integrity only when used in authenticated modes (e.g., GCM) but "AES" alone is not the integrity component. An IV helps randomize encryption but does not validate integrity. TKIP is a legacy WLAN protocol component, not the general integrity verifier. Therefore, the correct component for verifying message integrity among the options is HMAC.
NEW QUESTION # 79
(What is a digital signature?)
Answer: D
Explanation:
A digital signature is a cryptographic mechanism that enables a recipient to verify who created a message (authenticity) and that the message has not been altered (integrity). It is typically built using asymmetric cryptography: the signer uses a private key to sign a hash (digest) of the message, producing a signature.
Anyone with the signer's public key can verify that the signature matches the message digest, confirming the signature was created by the corresponding private key and that the content remains unchanged. Digital signatures do not primarily provide confidentiality; the signed message may still be readable unless separately encrypted. They also support nonrepudiation in many operational contexts because a valid signature can be strong evidence that the private key holder authorized the signed data, assuming key protection and policy controls. Common digital signature algorithms include RSA-PSS, ECDSA, and EdDSA. Certificates (X.509) are often used to bind public keys to identities, allowing verifiers to trust the claimed signer. Therefore, the best definition is a technique to verify authenticity and integrity.
NEW QUESTION # 80
(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: B
Explanation:
In a public key infrastructure, trust in a certificate ultimately depends on the relying party's trust anchor set- typically the root CA certificates preinstalled in a customer's browser/OS trust store. For customers to accept the company's certificate as legitimate, the buyer (customer) must trust the root CA public key (or an intermediate chained to it) so they can validate the certificate chain and signatures. The seller (the company) also must trust and rely on the root CA public key to build and present a valid chain and to make operational decisions based on that CA's issuance and revocation mechanisms; practically, the seller selects a CA whose root is widely trusted by customers. The cloud provider's trust is not what makes the certificate valid to customers; the provider may terminate TLS or pass traffic through, but customer validation is based on the chain to a trusted root. Government agencies like the FTC are not part of the cryptographic trust path for TLS certificate validation. Therefore, among the given options, the correct pairing is the seller and the buyer, reflecting both the issuer selection/usage by the company and the relying-party validation by customers.
NEW QUESTION # 81
(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 # 82
(How are limits managed for the number of bitcoins that can be created and stored in a blockchain?)
Answer: C
Explanation:
Bitcoin's supply is controlled by protocol rules enforced by consensus: new bitcoins enter circulation through the block subsidy awarded to miners for producing valid blocks. This subsidy is programmed to halve at fixed intervals (every 210,000 blocks), which steadily reduces the rate of new coin creation over time and asymptotically approaches a capped total supply (commonly cited as 21 million BTC).
This mechanism is often called the halving schedule and is the primary way limits are managed. The number of participants is not fixed; anyone can run a node or mine. There is no per-country cap and no per-person maximum enforced by the protocol-addresses and ownership are not limited that way. The supply cap emerges from the decreasing issuance schedule combined with consensus validation rules that reject blocks creating coins beyond what the schedule allows. Therefore, the correct answer is that limits are managed because rewards for mining reduce over time.
NEW QUESTION # 83
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