Question 1

How do I hash a password with BCrypt.Net in C#?

Accepted Answer

Use the BCrypt.HashPassword method with your plain text password; it automatically generates a salt with a default work factor of 11. The README provides quick start code examples for hashing and verification.

Question 2

What is the default work factor in BCrypt.Net and should I change it?

Accepted Answer

The default work factor is 11 (2^11 rounds), which balances security and performance. Increase it over time as hardware improves, but test performance impacts in your application first.

Question 3

BCrypt.Net vs PBKDF2 for .NET password hashing: which is better?

Accepted Answer

Bcrypt is generally preferred for its built-in salt management and adjustable cost, while PBKDF2 requires more manual configuration. Bcrypt is slower by design, offering better resistance to brute-force attacks in most scenarios.

Question 4

Does BCrypt.Net work with ASP.NET Core Identity?

Accepted Answer

Yes, but it requires custom implementation since ASP.NET Core Identity uses different hashers by default. You can override the IPasswordHasher interface to integrate BCrypt.Net for password storage.

Question 5

How to upgrade from older versions of BCrypt.Net to V5?

Accepted Answer

Monitor the GitHub releases for migration guides, as V5 may introduce breaking changes. Backward compatibility is maintained for hashes, but API changes could require code updates, so plan testing accordingly.

Question 6

Is BCrypt.Net secure for storing passwords in mobile apps?

Accepted Answer

Yes, but consider performance on mobile devices due to bcrypt's computational cost. Adjust the work factor lower if needed, but balance security with user experience, as higher factors may slow down authentication.

BCrypt.Net

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