Why is verification used in ict

For example:. Imagine that data about employees addresses, phone numbers etc is being entered into a computer system by typing in information found on a printed form that each employee filled in. The data in the system must be identical to the data on the printed forms or there could be problems if an employee needs to be contacted at home at a later data. There are two types of verification checks that makes sure that data in the system is accurate:.

Verification Check. This is where data is entered twice by two different people. The computer compares the two entries and lets the user know if it finds any differences.

NOTE: Double entry is often used when you set up online accounts. You are often asked to entered your choice of password twice to make sure that you haven't pressed an incorrect key by mistake. This is where the person entering data into the computer system carefully compares what they have entered with the data in the original document. Next - Development and Testing. Links to Theory Units:. Section 1: Types and Components of Computer Systems. Section 2: Input and Output Devices.

Section 3: Storage Devices and Media. Section 4: Computer Networks. Section 5: Data Types. Section 7: Part 2. Section 8: Systems Analysis and Design. Section 9: Communication. Section Document Production. Section Data Manipulation. Section Integration. Section Output Data. Section Data Analysis.

Section Web site Authoring. Section Presentation Authoring. Key Words:. What is design? What is included within these designs? Designing System Validation. Security Verified Security Verified is an open standard for the information security of organisations.

Security Verified background Security Verified was created in summer , as a response to questions from several smaller technology startups. Standard elements The standard consists of the following elements The Security Verified requirements — a short checklist with the exact criteria for the certificate The Security Verified certificate register — This list allows anyone to check which organisations have obtained a certificate. The information security review process used for checking whether organisations qualify for a certificate.

Information security resources , including standards, innovative companies and professional organisations. In addition, the following articles are recommended reading, in the following order Getting started with information security Creating an asset inventory A simple risk management approach Password policy rules Cryptographic controls policy Standard maintenance and versions The standard is maintained by the ICT Institute information security team, consisting of Sieuwert van Otterloo, Floris van den Broek, Joost Schalken and other experts.

Length Check. Length checks are used to check that input data contains a certain number of characters. For example if a value in a certain field had to contain five digits and only four digits were input, an error message would be given to the user. Presence Check. A presence check is used to make sure that a value has actually been entered in a field. In some database files entering data in certain fields can be optional. Other fields, such as key fields for example, are compulsory and must have values entered in them.

A presence check makes sure that data is present in a field where it is compulsory that a value is needed. Parity check. Sometimes when data is being transferred electronically from one place to another it can become corrupted.

A parity check is used to make sure that data has not been corrupted during transmission. Data is transmitted as a binary pattern of 0s and 1s. A parity check involves adding an extra 0 or 1, called a parity bit , to the binary pattern so that the total number of 1s in the pattern is either an even number, this is called even parity , or an odd number, this is called odd parity.

Even Parity In even parity the parity bit is set to either 0 or 1 so that the total number of 1s adds up to an even number. In this example there are four 1s so the value 0 is needed in the parity bit to keep the number of 1s even. Odd Parity In odd parity the parity bit is set to either 0 or 1 so that the total number of 1s adds up to an odd number.

In this example there are two 1s so the value 1 is needed in the parity bit to make the number of 1s odd. Hash total. Hash totals are used to check that groups of numbers have been input correctly. A hash total is the sum of a group of numbers that are going to be input. The hash total is input along with the numbers.