IGCSE Computer Science Paper-1: Specimen Questions with Answers 11 - 12 of 164

Question 11

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List the reason for using a PIN to carry out cash transaction at the ATM.

Explanation

A PIN no. is also known as the Personal Identification Number. As soon as we swipe the card in the ATM machine, it is this PIN no usually a 4-digit number that authenticates the user of the account. He/She receives an OTP (One Time Password) to further validate the authenticity of the account holder. Thus to maintain the confidentiality and authenticity of the bank account holder, a PIN number is essential.

Question 12

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What do you mean by Sid and Srm?

Explanation

SID or Security Identifier is an internal value used to uniquely identify a user or a group.

Image of the Components of Security Identifier
Image of the Security Reference Model

i) It contains User and Group Security Descriptors, 48bit ID authority, Revision level, Variable subauthority values.

ii) Each account has a unique SID being issued by an authority.

Srm or the Security Reference Model is defined as the Kernel Mode component that is responsible for the actual access validation as well as audit generation.

i) It provides a common language and methodology for discussing security and privacy.

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