That is pretty much what Tails is doing: If you disconnect the USB drive with the system, it will wipe the RAM and then shut down. However the data on the USB d

That is pretty much what Tails is doing: If you disconnect the USB drive with the system, it will wipe the RAM and then shut down. However the data on the USB drive isn't modified, so if you don't trust its encryption you should prepare for quick physical destruction and/or disposal.