You can generate a secure random bitstream by flipping a coin. To eliminate bias, use the von Neumann procedure: flip the coin twice; if the results differ, use

You can generate a secure random bitstream by flipping a coin. To eliminate bias, use the von Neumann procedure: flip the coin twice; if the results differ, use the first; otherwise, try again. If you're paranoid about snooping, go out into the woods or make a Faraday cage or something.