how to encrpt password for Secure store service while configuring by Windows powershell Script

To configure Secure store service, we have to mention user name and passowrd for generating key.

For this is password we are giving in plain text which is readable and also which is security violation as per company rules.

so i want to encript the password,so that no body can read and it is not against security violation.

so any body can tell me how to encrpt password while configuring secure store service using powershell command