Thank you! For your activity to remain hidden there aren't any good alternatives unless you really know what you're doing, and even the experts sometimes end up in Jail. For secure long distance communication the Pigeon is still a good alternative. Sometimes it's easier to disappear into the masses rather than trying to achieve invisibility. Another thing to not lose sight of; laws can change at any time and marshal law would give any government instant access to all available data within it's borders. Then there is Minix, a micro os baked into your Intel chips, accessible regardless of the OS on your hard drive. Go ahead; Google ~ Minix on Intel.
Greetings!