Why government backdoors in computer don't work

Computers need to be told everything. They cannot work without being told exactly what to do. Every detail must be present. In order to put a backdoor in a computer you need to tell the computer how the backdoor works. Exactly how it works. In particular you need to tell the computer what password the people accessing the backdoor will use. That is needed so when people access the backdoor the computer can compare the provided password with the password that is expected. That means that for every computer you ship, the 'secret' password is encoded in the computer. That means that the bad guys can buy the computer and take it apart and analyze the code to find the password. Then the bad guys know the password and can use the backdoor. Calling the backdoor, 'The Government Backdoor', does not prevent anyone from accessing the backdoor. The name is a false name and causes people to have assumptions about the back doors that is not true.

** I have simplified this slightly since backdoors can be implemented with more sophisticated algorithms than passcode because that is more understandable. The other approaches suffer the same problems but describing them in that terms obscures the key point.