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SHA1 Hash Generator
Generate SHA-1 (Secure Hash Algorithm 1) cryptographic hash for text and files
Hash Text
Examples:
Hash File
About SHA-1
- • SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function
- • Produces a 160-bit (20-byte) hash value, typically rendered as 40 hexadecimal digits
- • Designed by the NSA and published by NIST in 1995
- • One-way function: cannot be reversed to obtain the original data
- • Deterministic: same input always produces the same hash
- • Faster than SHA-256 but less secure
Common Uses (Legacy):
- • Git version control (still uses SHA-1 for object identification)
- • Legacy file integrity verification
- • Backward compatibility with older systems
- • Non-security critical checksums
- • Legacy certificate fingerprints
Important Security Warning:
⚠️ SHA-1 is DEPRECATED for security purposes!
- • SHA-1 has been broken - collision attacks have been demonstrated
- • Google and CWI Amsterdam created a collision in 2017 (SHAttered attack)
- • Should NOT be used for digital signatures or certificates
- • Major browsers no longer accept SHA-1 SSL certificates
- • Use SHA-256 or SHA-3 for security-critical applications
- • Only use SHA-1 for backward compatibility or non-security purposes