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CRC32, XXHash, or SHA-256: Choosing the Right Checksum for the Job

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Checksums are widely used to verify file integrity, detect duplicates, and confirm data hasn't changed, but different algorithms suit different needs. CRC32 is fast and lightweight, making it suitable for catching accidental data corruption during transfers, though it was never designed to resist deliberate collisions. XXHash offers even greater speed and works well for deduplication tasks where inputs are controlled and security is not a concern. SHA-256 is a cryptographic hash that makes collisions computationally infeasible, making it the appropriate choice for audits, legal verification, and any destructive file operations. Experts recommend selecting a checksum based on the consequence of being wrong rather than raw performance benchmarks alone.

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CRC32, XXHash, or SHA-256: Choosing the Right Checksum for the Job · ShortSingh