Hash Collision Probability Calculator
Calculate hash collision probability using birthday paradox. Find collision probability and birthday bound for hash functions.
Inputs
bits
Results
Collision Probability
0%
Expected Collisions
0
Birthday Bound
400,651,869,298,001,200,000,000,000,000,000,000,000
Time to Collision0 days
How to Use This Calculator
- Enter the hash function digest size in bits.
- Set the number of messages to be hashed.
- Review the probability of at least one collision occurring.
- Ensure the collision probability is below your application acceptable risk threshold.
- For digital signatures, collision resistance requires a hash output at least twice the desired security level.
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Formula
P(collision) ≈ 1 - e^(-n²/(2×m))Related Calculators
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