All Algorithms
SHA-1
Conditionally SafeHash Function algorithm
This algorithm is safe with sufficient key/output size. Grover's algorithm halves the effective security level.
Algorithm Details
Category
Hash Function
Quantum Safety
Conditionally Safe
Key Lengths (bits)
160
FIPS Standard
FIPS 180-4 (deprecated for signatures)
Deprecation Date
2011
Known Vulnerabilities
- Collision attacks (SHAttered, 2017)
- Chosen-prefix collisions (2020)
- Grover's algorithm
Notes
Collision attacks are practical (SHAttered project). NIST deprecated SHA-1 for digital signatures in 2011. Post-Grover preimage resistance of ~80 bits is insufficient. Do not use.
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