Parity check definition
A parity check refers to an error detection method where an extra bit, or a parity bit, is added to each data unit. Parity check provides a simple and efficient method for detecting errors in data transmission and storage as well as helping ensure a secure data transmission process.
Benefits of parity checking
- Simplicity. Parity checks are simple to implement and do not require significant computational resources.
- Low costs. Parity checks are cheap as they only require adding a small bit to each data unit.
- Accuracy. Parity checks help ensure the accuracy of the communication as every transmission is checked.
- Improved security. Parity checks add an extra layer of security to communication and help prevent data loss.
- Enhancements. Parity check can be enhanced with advanced error detection methods such as cyclic redundancy check or forward error correction.
Drawbacks of a parity check
- Limited error detection. Two-dimensional parity checks can only find code errors causing the parity number to change.
- Unclear detection. A parity check does not help find which bit of code is false.
- False errors. Parity checks can sometimes result in a false positive.
- Basic security. While a parity check can work as an additional security layer, it can be bypassed with a malicious program that keeps the parity bit the same.
See also: Even parity, odd parity