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Question:
(a) What is the use of digital certificate?
(b) What is meant by a hierarchical trust model in a Public Key Infrastructure? How does the Pretty Good Privacy (PGP) model of trust differ from this? Illustrate your answer with diagrams. Why is it important that PGP certificates allow multiple signers?
(c) What do you understand by certificate revocation? Give two instances when a certificate needs to be revoked. How does the public key infrastructure handle revocation?
(d) As a web user, how can you tell if the site you are communicating with is using SSL security?
(e) Explain how the dual signature used in the Secure Electronic Transaction (SET) protocol allows privacy, that is, the merchant can see only the order information and the bank can access only the payment information.
(f) Why is the 3-D secure protocol more secure than SET?
(a) (i) Bob has public RSA key (n = 77, e = 7). Show that Bob's private key is (d = 43). (ii) Alice wants to send the message m = 13 to Bob. She encrypts the message usi
The method used to check errors is checksum . In this method data is treated as a sequence of integers and their arithmetic sum is calculated and the carry bits are added to the
MB Enterprise Systems Ltd based in Mauritius is a company specialized in application development with Europe as the main customer base. The company has implemented CMMI and has rec
Question (a) For the bit stream 010011, show the waveforms for each of the code indicated. Consider that the signal level for NRZ-L for mark is positive; the signal level for t
The "Big Red Rocks" (BRR) mining company is based and operates in Western Australia. They are primarily an iron ore miner, but they also produce electricity through tidal power to
Convert (111011)2 to ( )10
What is the use of it
Problem: (a) What is the minimum length of a password that could be considered to be "strong" in the context of today's computing power? (b) The security of a PIN system,
There is another probing methods i-e Trace Route. To get more detail it is used As given in the figure about the route to DANDELION-PATCH.MIT.EDU was looked out a
Question: (a) How can you prevent someone from accessing your computer when you leave your office for some time? (b) What is the difference between a classic login and a w
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