Hash Generator
Generate SHA-256, SHA-1, MD5 hashes.
Compute cryptographic hashes of text using SHA-256, SHA-1, MD5, or SHA-512.
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🔒 The Art of One-Way Functions
Cryptographic hash functions are one-way: easy to compute, impossible to reverse. MD5 was king
in the 1990s until researchers found ways to create collisions. SHA-1 followed in 2017. Today,
SHA-256 (part of SHA-2 family) is the gold standard—until quantum computers change everything.
🤯 Wacky Facts
- Bitcoin mining is essentially a race to find SHA-256 hashes with enough leading zeros
- MD5 was cracked in 2004—researchers created two different files with the same hash
- Google created the first public SHA-1 collision in 2017 using 9 quintillion computations
- The entire Bitcoin network computes roughly 500 exahashes per second
- A single bit change in input creates a completely different hash (avalanche effect)
💡 Useful Tips
- Never use MD5 for security: It's only suitable for checksums and non-security uses
- Salt your password hashes: A random salt prevents rainbow table attacks
- Use bcrypt for passwords: It's intentionally slow to resist brute force
- Verify downloads: Compare the hash of downloaded files to the published hash
- Hash comparison: Use constant-time comparison to prevent timing attacks
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