The FBI could then decrypt the messages with a private key associated with the message, without ever needing remote access to the devices.[2][8] The devices also had a fixed identification number assigned to each user, allowing messages from the same user to be connected to each other.[8] According to a since-deleted Reddit post discovered by Motherboard, the ANOM app was "for Android";[9][better source needed] a WordPress blog post described the app as using a "custom Android OS".[5][better source needed]