1.6. Security, privacy and data integrity
A subsection of Computer Science, 9608, through 1. Theory Fundamentals
Listing 10 of 18 questions
A small company produces scientific magazines. The owner buys some new desktop computers. The computers are used to store thousands of colour images (diagrams and photographs). All the computers have Internet access. Name three utility programs the company would use on all their computers. Describe what each program does. Description Description Description The images contained in the magazines are produced using either bitmap or vector graphics software. Give four differences between bitmap and vector graphics. Employees using the new computers receive training. At the end of the training, each employee completes a series of questions. Three answers given by an employee are shown below. Explain why each answer is incorrect. “Encryption prevents hackers breaking into the company’s computers.” “Data validation is used to make sure that data keyed in are the same as the original data supplied.” “The use of passwords will always prevent unauthorised access to the data stored on the computers.”
9608_w16_qp_13
THEORY
2016
Paper 1, Variant 3
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A Local Area Network is used by staff in a hospital to access data stored in a Database Management System (DBMS). Name two security measures to protect computer systems. A frequent task for staff is to key in new patient data from a paper document. The document includes the patient’s personal ID number. The Patient ID is a seven digit number. The database designer decides to use a check digit to verify each foreign key value that a user keys in for a Patient ID. When a user assigns a primary key value to a Patient ID, the DBMS adds a modulus-11 check digit as an eighth digit. The DBMS uses the weightings 6, 5, 4, 3, 2 and 1 for calculating the check digit. It uses 6 as the multiplier for the most significant digit. Show the calculation of the check digit for the Patient ID with the first six digits 786531. Complete Patient ID Name and describe two validation checks that the DBMS could carry out on each primary key value that a user keys in for a Patient ID. Validation check Description Validation check Description
9608_w17_qp_11
THEORY
2017
Paper 1, Variant 1
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A Local Area Network is used by staff in a hospital to access data stored in a Database Management System (DBMS). Name two security measures to protect computer systems. A frequent task for staff is to key in new patient data from a paper document. The document includes the patient’s personal ID number. The Patient ID is a seven digit number. The database designer decides to use a check digit to verify each foreign key value that a user keys in for a Patient ID. When a user assigns a primary key value to a Patient ID, the DBMS adds a modulus-11 check digit as an eighth digit. The DBMS uses the weightings 6, 5, 4, 3, 2 and 1 for calculating the check digit. It uses 6 as the multiplier for the most significant digit. Show the calculation of the check digit for the Patient ID with the first six digits 786531. Complete Patient ID Name and describe two validation checks that the DBMS could carry out on each primary key value that a user keys in for a Patient ID. Validation check Description Validation check Description
9608_w17_qp_13
THEORY
2017
Paper 1, Variant 3
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The following incomplete table shows descriptions relating to the security of data transmission. Complete the table with the appropriate terms. Description Term A The original data to be transmitted as a message B An electronic document from a trusted authority that ensures authentication C An encryption method produced by a trusted authority that can be used by anyone Explain the purpose of a digital signature. Describe how a digital signature is produced for transmission with the message.
9608_w19_qp_32
THEORY
2019
Paper 3, Variant 2
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Parity bits can be used to verify data. The following binary number is transmitted using even parity. Add the missing parity bit. Parity bit In the following parity block, the first column contains the parity bits, and the last row contains the parity byte. A device transmits the data using even parity. Circle the error in the data transmitted. Parity bit Data Parity byte Explain how you identified the error. The data received can contain errors that are not detected using parity bits. Explain how this can happen. Parity is not the only method to verify the data has been sent correctly. Name and describe one other method of data verification during data transfer. Name Description
9608_s18_qp_11
THEORY
2018
Paper 1, Variant 1
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Parity bits can be used to verify data. The following binary number is transmitted using odd parity. Add the missing parity bit. Parity bit In the following data transmitted, the first column contains the parity bits, and the last row contains the parity byte. A device transmits the data using even parity. Circle the error in the data transmitted. Parity bit Data Parity byte The following table shows five error detection measures. Put one tick (3) in each row to indicate whether the measure is validation or verification. Measure Validation Verification Checksum Format check Range check Double entry Check digit
9608_s18_qp_12
THEORY
2018
Paper 1, Variant 2
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Parity bits can be used to verify data. The following binary number is transmitted using odd parity. Add the missing parity bit. Parity bit In the following parity block, the first column contains the parity bits, and the last row contains the parity byte. A device transmits the data using even parity. Circle the error in the data being transmitted. Parity bit Data Parity byte Four error detection measures are shown. Draw one line from each error detection measure to indicate whether it is verification or validation. Verification Validation Type check Proof reading Check digit Checksum Error detection measure
9608_s18_qp_13
THEORY
2018
Paper 1, Variant 3
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Questions Discovered
18