During the ATM’s operation, we need proof that the securitysuite within the bank system is still running and that it is upto-date. We propose that the security suite actively gives somekind of a “sign of life” from time to time. We may assumethat this application is the only one that is given access to thevTPM within the bank system—i.e. the authorization codefor the vTPM is only known by that application.