Hello Good Morning

I am developing a Web Application Java/J2EE and users must be
authenticate on RSA/ACE Server. But PIN only must be validate 2 pin's
position.


Step 1. User

UserName: us123456
Pin: 1234
Passcode: 452367


I want to validate 2 pin's position.
Example: *2*4 (second position and fourth position)


At current, I don't know how does PIN get?, i need only validate two
positions randomly.

Thanks