IGCSE Computer Science Paper-1: Specimen Questions with Answers 33 - 35 of 164

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Question 33

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Show through a diagram how transaction takes place through a POS machine.

Explanation

The Diagram Show POS Machine

Question 34

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What is the meaning of Pretty Good Privacy (PGP) ?

Explanation

PGP or Pretty Good Privacy (PGP) is a king of an encryption program. This protocol is used for signing, encrypting, and decrypting texts, e-mails, files, directories, and whole disk partitions and to increase the security of e-mail communications.

Using an efficient algorithm PGP generates a hash from the user՚s including other signature information during sending digital signatures. This hash code gets encrypted using sender՚s private key. The sender՚s public key is being used by the receiver to decrypt the hash code.

The Pretty Good Privacy

Question 35

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Explain the purpose behind the use of Modem and ISP by the Tourist Information Centre

Explanation

Information related to the specific areas of attraction, maps and lodgings etc are being provided to the tourists for which the use of a Modem or ISP is a must.

The tourists are able to get information such as travel guidelines, brochure, hotels/rooms availability, prices, number of days to be stayed along with the availability of tickets is also possible with the sue of Modem and ISP.

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