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(a) Which PKI (Public Key Infrastructure) model is typically favored by business organization?
(b) Give one possible use of the "extensions" field of an X.509 certificate.
(c) Users in a PKI can obtain digital certificates of users they want to communicate with. Which protocol is typically used to interact with the directory server to obtain certificate(s)?
(d) Calculate the RSA public and private keys given the values of p and q as follows: p = 17; q = 11. Show details of workings.
Choose e = 7
(e) What is meant by Certificate Revocation? When would a certificate have to be revoked?
(f) Alice and Bob are communicating.
i. Explain how Alice and Bob can communicate such that all their communication can be authenticated and can be verified for integrity.
Confidentiality is not required.
ii. Modify your answer such that now it also provides replay attack detection.
Using the selected approach, you should then conduct an audit or review of the information security issues associated with the use of computing facility and report on the findings.
Consider the following case study: In order to avoid criticisms of their existing manned road-toll payment system on its private road, WS-Pass has decided to adopt an automated
Explain in DES Data Encryption Standard : DES stands for Data Encryption Standard and is explained as follows: DES is at present the most widely used key cryptographic systems
Describe the process a proposed standard goes through to become an RFC
Problem (a) Give two reasons for companies to implement security measures. (b) What is the regulatory expectation regarding i. healthcare information, ii. financial
Hypothetical reliable data transfer protocol: A jumping window based Go-back-N ARQ protocol for file transfer using UDP as the transport protocol: In this protocol, a window o
(a) Using the extended Euclidean algorithm, find the multiplicative inverse of 504 mod 67. (b) Decrypt the following ciphertext, which has been encrypted using Caesar cipher:
In this work a network intrusion system (package) must implement based on high interaction honeypots. There are two honeypots with different platforms (ubuntu and windows server 20
Proof that the sender forwards the message. It also prohibits the author of the code from falsely denying that he forward the message. This is achieved by record using the exact ti
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