Format guide
MD5 checksum
Message Digest 5 (RFC 1321)
MD5 produces a 128-bit (32 hex character) fingerprint of any input. Designed by Ron Rivest in 1991, it's been cryptographically broken since 2004 (collisions can be manufactured) — still widely used for non-security checks like file integrity verification on package mirrors, CDN caches, and data deduplication where collision attacks aren't a concern. Output format matches the standard `md5sum` CLI: `<hex> <filename>`.
How to open a MD5 checksum file
Any text editor opens the .md5 checksum file. Verify with `md5sum -c file.md5` on Linux/Mac (Windows: `certutil -hashfile`). Most package managers and CDNs publish .md5 alongside downloads to detect transfer corruption.
Primary use
File-integrity verification on package mirrors and CDN downloads.
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