What is the bcrypt cost factor and how does it affect security?

What is the bcrypt cost factor and how does it affect security?

The bcrypt cost factor determines the computational complexity of hashing a password. A higher cost factor means more time and resources are needed to hash the password, making it more secure against brute-force attacks.

How do I choose the right cost factor for my application?

Choosing the right cost factor depends on your application's performance requirements and the hardware it runs on. A common starting point is 10, but you should test to find a balance between security and performance.

What happens if I set the cost factor too high?

If the cost factor is set too high, it can lead to slow performance, making user authentication sluggish. This can frustrate users and impact the overall user experience.

Can I change the cost factor after users have registered?

Yes, you can change the cost factor, but you'll need to rehash existing passwords with the new cost factor when users log in again.

Are there any best practices for using bcrypt?

Yes, always use a cost factor that balances security and performance, regularly update your cost factor as hardware improves, and ensure you use a unique salt for each password.