I am a C++ enthusiast who likes maths, homotopy type theory, template metaprogramming and all the intricacies of formal specifications of programming languages and mathematical foundations.
You can compute one time pads by hand on paper.
I believe matrix can leak metadata.
Whatever solution you think you can come up with is most likely not secure.
Having my passwords written down on a piece of paper is not safe ?
You can compute one time pads by hand on paper.