Definition

Noun: A checksum is a value calculated from a set of data, used to detect errors that may have been introduced during its transmission or storage. It is typically a small, fixed-size datum derived by applying a specific algorithm to the original data. The core function is to verify data integrity by comparing the checksum calculated before and after transfer.

Usage

The word checksum is used as a noun. It refers to the calculated value itself and the concept of error detection. - The system generates a checksum for each file before uploading. - To verify the download, compare the provided checksum with the one you calculate locally. - A mismatch in the checksum indicates the data is corrupted.

Examples

Advanced Usage

• "To run a checksum": To perform the calculation and verification process.
  • Always run a checksum on important downloads to ensure file integrity.
• "Checksum validation/verification": The act of checking the calculated value against a reference.
  • The automated process includes checksum verification at each step.

Variants and Related Words

• Checksumming (gerund/noun): The act or process of calculating a checksum.
  • The checksumming of large archives can take several minutes.
• Checksummed (adjective): Describes data for which a checksum has been calculated.
  • The checksummed files are ready for distribution.

Synonyms

• Hash value: Often used interchangeably in computing, though a hash is typically more complex and used for security as well as integrity.
• Error-detection code: A broader term that includes checksums and other methods like CRCs (Cyclic Redundancy Checks).

Related Phrases

• "Verify the checksum": To check the integrity of data by comparing checksums.
  • The first step after installation is to verify the checksum of the critical system files.
• "Checksum algorithm": The specific mathematical formula used to create the checksum (e.g., MD5, SHA-256, simple addition).
  • The older protocol uses a very simple checksum algorithm.

Noun

1. a digit representing the sum of the digits in an instance of digital data; used to check whether errors have occurred in transmission or storage