Specify the type of authentication that you want to use by performing one of the following steps:
To use static pre-shared keys for authentication, click Pre-Shared Key, and enter a key (such as "CisCo").
To use digital certificates for authentication, click Certificate, choose the Certificate Signing Algorithm (rsa-sig/dsa-sig) from the drop-down menu, and then choose a pre-configured trustpoint name from the drop-down menu.
Click Next to continue