I am not sure if you understand the complexity of validating crypto or finding backdoors in software. It is possible to find bugs in closed source software and

I am not sure if you understand the complexity of validating crypto or finding backdoors in software. It is possible to find bugs in closed source software and as the link I provided proves it is possible to "hide" backdoors in open source software. 100% secure? You must be joking. Since there is no code without bugs and certain percentage of bugs have security implications there is no 100% secure.