# DA-Op3n ca interface

## crypto fun

# Login

# Encrypted messaging — Login

## Password-based login

Username: |
Password: |

## Login using Challenge/Response

If you would like to use cryptography to sign in, please enter your username below. You will then be presented with a random challenge which you have to sign using your registered RSA key (you can register that key after logging in with username and password).

Username:

> SQL, Lisp, and Haskell are the only programming languages that I've seen where one spends more time thinking than typing. Philip Greenspun