Abstract: In this application we describe a solution to the following problem. Consider publicly accessible shared machines such as washers and dryers in a public Laundromat or in a laundry room in an apartment building shared by the tenants of the building. The machines have the property that they are (1) publicly accessible by a large number of users and (2) while in use it is desirable that they should be only accessible by the user who started the machine. That is to say, the user who starts the machine wants to have its content protected from other users for the duration of the machine normal operation.