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NEW QUESTION 53 What is the solution to the equation 8 mod 3?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: A Explanation: 2 https://en.wikipedia.org/wiki/Modulo_operation The modulo operation returns the remainder or signed remainder of a division, after one number is divided by another (called the modulus of the operation). Given two positive numbers a and n, a modulo n (abbreviated as a mod n) is the remainder of the Euclidean division of a by n, where a is the dividend and n is the divisor. The modulo operation is to be distinguished from the symbol mod, which refers to the modulus (or divisor) one is operating from. For example, the expression "5 mod 2" would evaluate to 1, because 5 divided by 2 has a quotient of 2 and a remainder of 1, while "9 mod 3" would evaluate to 0, because the division of 9 by 3 has a quotient of 3 and a remainder of 0; there is nothing to subtract from 9 after multiplying 3 times 3.   NEW QUESTION 54 What size block does AES work on?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: A Explanation: 128 https://en.wikipedia.org/wiki/AdvancedEncryptionStandard Rijndael is a family of ciphers with different key and block sizes. For AES, NIST selected three members of the Rijndael family, each with a block size of 128 bits, but three different key lengths: 128, 192 and 256 bits.   NEW QUESTION 55 Which of the following areas is considered a strength of symmetric key cryptography when compared with asymmetric algorithms?

• A. Speed
• B. Security
• C. Scalability
• D. Key distribution

Answer: A Explanation: Speed Symmetric key systems are considerably faster than asymmetric key systems but have issues with proper key distribution, controlling keys as more users need to communicate, and cannot provide non-repudiation or authenticity.   NEW QUESTION 56 What does the OCSP protocol provide?

• A. Encryption
• B. VPN connectivity
• C. Revoked certificates
• D. Hashing

Answer: C Explanation: Revoked certificates https://en.wikipedia.org/wiki/OnlineCertificateStatus_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 57 A real time protocol for verifying certificates (and a newer method than CRL).

• A. Registration Authority (RA)
• B. Online Certificate Status Protocol (OCSP)
• C. Server-based Certificate Validation Protocol (SCVP)
• D. Public Key Infrastructure (PKI)

Answer: B Explanation: Online Certificate Status Protocol (OCSP) https://en.wikipedia.org/wiki/OnlineCertificateStatus_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). Incorrect answers: Public Key Infrastructure (PKI) - set of roles, policies, hardware, software and procedures needed to create, manage, distribute, use, store and revoke digital certificates and manage public-key encryption. The purpose of a PKI is to facilitate the secure electronic transfer of information for a range of network activities such as e-commerce, internet banking and confidential email. It is required for activities where simple passwords are an inadequate authentication method and more rigorous proof is required to confirm the identity of the parties involved in the communication and to validate the information being transferred. Registration Authority (RA) - component of PKI that validates the identity of an entity requesting a digital certificate. Server-based Certificate Validation Protocol (SCVP) - Internet protocol for determining the path between an X.509 digital certificate and a trusted root (Delegated Path Discovery) and the validation of that path (Delegated Path Validation) according to a particular validation policy.   NEW QUESTION 58 ......