System Analysis and Design Paper 50

1

By information system testing we mean






2

Security in the design of information system is used to






3

Some security measures commonly used are
i. data encryption
ii. logging of all accesses to an information system and recording changes made (if any)
iii. data compression
iv. copying of files






4

Controls are necessary in information systems as
i. massive amounts of data are processed and human errors are expected in data entry
ii. accidental errors can lead to loss of money and credibility in a system
iii. to protect the system from virus attack
iv. data may be lost due to disk crashes






5

Audit in the design of information system is used to






6

A two way check






7

Some of the features of audit package used to check systems are:
i. facility to total specified items based on some criteria
ii. extracting items based on some criteria for checking
iii. check-pointing and restart facility
iv. hardware faults recovery






8

By string test we mean






9

The following measures are taken to ensure security of information systems:
i. duplicate copies of data/programs are kept in a different place preferably in fire-proof vault
ii. password protection is used to prevent unauthorized access
iii. no one is allowed to alter data in the database
iv. no one is allowed alter programs






10

The major objectives of control areAt each check-point
i. guard against frauds in data entry/processing
ii. check clerical handling of data before it enters a computer
iii. to provide a method to trace the steps and find where error has occurred
iv. automatically correct errors in data entry/processing






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