Tuesday, 1 January 2013
| Question#1: ( 5 Marks ) Private key means that each computer has a secret key (code) that it can use to encrypt a packet of information before it is sent over the network to the other computer. Private key requires that you know which computers will talk to each other and install the key on each one. Private key encryption is essentially the same as a secret code that the two computers must each know in order to decode the information. The code would provide the key to decoding the message. Receiver party should know the secret code to decrypt message. Suppose Ahmad's friend is living abroad and he wants to send a coded message to his friend. Ahmad wants that only his friend may read/understand message. He applied a simple scheme and substituted each letter by the letter that is second to it. For example: "C" became "E" and "D" became "F". After applying scheme the result is: Oa rcuuyqtfu ctg "nkhg chvgt fgcvj" cof "cjocfmjcnkf" . You are required to decrypt Ahmad's message. Question # 2 : 5 Marks (2.5 +2.5 ) In this age, we want to make business /financial transactions simpler. In older traditional methods, we exchange physical money for transaction. We sometimes may have disadvantages in this way like security issues. Nowadays, ATM or smart cards for financial exchange are quiet popular. a) Having these facilities, what’s the need of Digital wallet? b) How Digital wallets work? Question # 3 : 5 Marks Survey : “ Measuring the Effectiveness and Value of E-Payment Solutions “ After reading this survey, we conclude a result that most of the big companies/businesses are using e-payments instead of manual paper system. Companies using new e-payments methods are generating relatively more revenue. How can you relate increase in revenue with use of e payment services? List any 5 features that are contributing in generating more revenue. (According to survey conducted) |
