One could, in theory, run Signal on a dedicated device without any other app. Not that it's likely in this case! The lack of access controls is a limitation of

One could, in theory, run Signal on a dedicated device without any other app. Not that it's likely in this case! The lack of access controls is a limitation of the Signal app, since it's not part of the intended purpose to use it for classified data there's no support for the functionality classified-data communications programs need. The insecurity of the device it runs on could be solved without the Signal Foundation releasing a new version, the lack of centralized access control can't be.