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NEW QUESTION 24
What does the OCSP protocol provide?
- A. Encryption
- B. Revoked certificates
- C. Hashing
- D. VPN connectivity
Answer: B
Explanation:
Revoked certificates
https://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol
The Online Certificate Status Protocol (OCSP) is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate.It is described in RFC 6960 and is on the Internet standards track. It was created as an alternative to certificate revocation lists (CRL), specifically addressing certain problems associated with using CRLs in a public key infrastructure (PKI). Messages communicated via OCSP are encoded in ASN.1 and are usually communicated over HTTP. The “request/response” nature of these messages leads to OCSP servers being termed OCSP responders.
NEW QUESTION 25
A linear congruential generator is an example of what?
- A. A random number generator
- B. A coprime generator
- C. A pseudo random number generator
- D. A prime number generator
Answer: C
Explanation:
A pseudo random number generator
https://en.wikipedia.org/wiki/Linear_congruential_generator
A linear congruential generator (LCG) is an algorithm that yields a sequence of pseudo-randomized numbers calculated with a discontinuous piecewise linear equation. The method represents one of the oldest and best-known pseudorandom number generator algorithms. The theory behind them is relatively easy to understand, and they are easily implemented and fast, especially on computer hardware which can provide modular arithmetic by storage-bit truncation.
NEW QUESTION 26
In which of the following password protection technique, random strings of characters are added to the password before calculating their hashes?
- A. Keyed Hashing
- B. Salting
- C. Double Hashing
- D. Key Stretching
Answer: B
Explanation:
Salting
https://en.wikipedia.org/wiki/Salt_(cryptography)
A salt is random data that is used as an additional input to a one-way function that hashes data, a password or passphrase. Salts are used to safeguard passwords in storage. Historically a password was stored in plaintext on a system, but over time additional safeguards were developed to protect a user’s password against being read from the system.
A new salt is randomly generated for each password. In a typical setting, the salt and the password (or its version after key stretching) are concatenated and processed with a cryptographic hash function, and the output hash value (but not the original password) is stored with the salt in a database. Hashing allows for later authentication without keeping and therefore risking exposure of the plaintext password in the event that the authentication data store is compromised.
Salts defend against a pre-computed hash attack, e.g. rainbow tables.Since salts do not have to be memorized by humans they can make the size of the hash table required for a successful attack prohibitively large without placing a burden on the users. Since salts are different in each case, they also protect commonly used passwords, or those users who use the same password on several sites, by making all salted hash instances for the same password different from each other.
NEW QUESTION 27
What must occur in order for a cipher to be considered ‘broken’?
- A. Finding any method that is more efficient than brute force
- B. Uncovering the algorithm used
- C. Decoding the key
- D. Rendering the cipher no longer useable
Answer: A
Explanation:
Finding any method that is more efficient than brute force
https://en.wikipedia.org/wiki/Cryptanalysis
Bruce Schneier notes that even computationally impractical attacks can be considered breaks: “Breaking a cipher simply means finding a weakness in the cipher that can be exploited with a complexity less than brute force.”
NEW QUESTION 28
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