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

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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.

The Components of Security Identifier
The Security Reference Model
  • It contains User and Group Security Descriptors, 48 bit ID authority, Revision level, Variable subauthority values.
  • 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.
  • It provides a common language and methodology for discussing security and privacy.

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