O-LevelComputer ScienceData Representation2210/12 · Oct/Nov 2019 · Q1010 Marks

Data is valuable to a company.

(a)Companies use error detection methods to make sure that data is accurate. One error detection method is the use of a check digit. Explain what is meant by a check digit and how it is used to detect errors.[4]
(b)Companies can use a range of security methods to keep their data secure. Identify two security methods that a company can use to keep their data secure and explain how each method can keep the data secure. Security method 1 Security method 2[6]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.

[1] (a) Validation method
[1] (a) Used to check data entry
[1] (a) Digit is calculated from data // by example
[1] (a) Digit is appended / added to data
[1] (a) Digit is recalculated when data has been input
[1] (a) Digits are compared
[1] (a) If digits are different, error is detected // If digits match, no error is detected
[1] (b) Firewall
[1] (b) ... Monitors the traffic
[1] (b) ... Blocks any traffic that doesn't meet the criteria / rules
[1] (b) (Strong) password // biometric
[1] (b) ... Data cannot be accessed without the use of the password / bio data
[1] (b) ... Prevent brute force attacks
[1] (b) Encryption
[1] (b) ... Data will be scrambled
[1] (b) ... Key is required to decrypt the data
[1] (b) ... If data is stolen it will be meaningless
[1] (b) Physical security methods
[1] (b) ... The physical security will need to be overcome
[1] (b) ... This can help deter theft of the data
[1] (b) Antispyware
[1] (b) ... will remove any spyware from system
[1] (b) ... will prevent data being relayed to a third party

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