Secure Remote Password (SRP)

https://en.wikipedia.org/wiki/Secure_Remote_Password_protocol

1. Client sends username

2. Server gets username and sends salt and B

3. Client gets salt and B, sends A (randomized number) and M1 (calculate with salt, B, A and password, S_Carol = (B − kg^x)^(a + ux))

4. Server verifies M1