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Security Notice
MD5 is not cryptographically secure. For passwords or sensitive signatures, use SHA-256.
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MD5 Knowledge Base
MD5: Still Useful, No Longer Secure
Where MD5 still earns its keep
MD5 is cryptographically broken — and still everywhere. The distinction that matters is integrity vs. security:
| Use | OK with MD5? | Why |
|---|---|---|
| File download checksums | Yes | Detecting accidental corruption, not attackers |
| Cache keys and ETags | Yes | Just needs to be fast and well-distributed |
| Deduplicating records | Yes | Same input, same hash — that's the whole job |
| Password storage | Never | GPU rigs try billions of MD5 guesses per second |
| Digital signatures / certificates | Never | Collisions can be manufactured deliberately |
What 'broken' actually means
Researchers can deliberately craft two different inputs with the same MD5 hash — a collision. For a cache key, irrelevant. For a signature, fatal: a malicious file could carry the same hash as a legitimate one. That asymmetry is why MD5 survives in plumbing but is banned from anything security-bearing. Legacy systems that compare MD5-hashed passwords aren't “hashed” in any meaningful sense anymore — they're a breach waiting to be exported.
Verifying a download in practice
Site publishes a checksum → you hash your downloaded copy here → strings match means the file arrived intact. A mismatch means re-download before suspecting anything darker. For anything security-relevant, generate SHA-256 instead — same workflow, unbroken algorithm. Hash strings often travel inside Base64 wrappers, and random identifiers (a different need than hashing) come from the UUID generator.