What is the recommended method for validating the integrity of a file?

Validating the integrity of a file is crucial for ensuring that it has not been altered or corrupted. The recommended method involves hashing the original file and the current version using a specific hashing algorithm, such as SHA-256, and then comparing the resulting hashes. If the hashes match, it confirms that the file remains unchanged. Hash functions are designed to produce a unique fixed-size output for even the slightest change in input, making them highly effective for integrity checks.

While utilizing a checksum involves a similar concept, it may refer to simpler algorithms that can be less secure than cryptographic hash functions like SHA-256. Comparing file sizes is an inadequate method since files can differ in size due to compression or minor changes, yet still be valid. Scanning for malware checks for malicious code but does not provide information about the integrity of the file itself. Therefore, hashing with a strong algorithm and comparing the results is the most reliable approach for validating file integrity.