I have a password to unlock my phone , then another one to open Signal to read my texts . There ' s still that for the person to get through . <| sep |> Ik a lot of people are saying build your own , and I get that you don ' t know how to build one . I recommend you to do some research and find some good parts and look up how to build one It ' s easy or start the project with your friends who know how to build one . Other then that if you still want a prebuilt one i don ' t recommend this one . <| sep |> That leaves the BIOS as attack vector . Or you attack the OS itself once the disk encryption is unlocked . Yeah , I guess that if someone has physical access to my computer , heshe could just install a hardware keylogger which I won ' t be able to detect . I guess that the attack on the BIOS could be mitigated by using hardware with libreboot or coreboot and a password to access the BIOS .