When validating user credentials, it's essential to use a function that compares hashed values in a way that is:
- Constant Time (O(1))
- Linear Time (O(n))
- Exponential Time (O(2^n))
- Logarithmic Time (O(log n))
The key to secure credential validation is to use a constant-time comparison to avoid timing attacks. A constant-time comparison ensures that the function takes the same amount of time regardless of whether the comparison succeeds or fails. This makes it harder for attackers to infer information based on timing differences.
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