Because of the high security focus, logging in requires two-factor authentication and a strong passphrase.
It requires your email address, your passphrase and a time based security code. You created your passphrase when you signed up.
Take special care of your passphrase. It is the basis for your cryptographic keys, and instrumental to the security of the application.
In addition to the passphrase, you also need a time based security code for Crypho's two-factor authentication. The two-factor authentication ensures that even if someone gets hold of your passphrase, they still cannot access your account.