The name of the app: Cryptocow (or simply use "cryptocow.com", or use them together)
Slogan 1 (official slogan): Quod latet, libera est
But please, get comfortable to use more shocking language too. You are free to use whatever slogan you feel like, as long as it conveys a message against the surveillance programs that governments launch worldwide to invade our privacy.
Theme 1: Democracy + Technology = Fight Back
Theme 2: My messages! My privacy!
Theme 4: You gotta fight for your right to privacy!
Theme 5: Cypherpunks unite!
Other Themes: Orwellian quotes, WWII Nazi propaganda reused, etc.
More themes are welcome, and you are welcome to be creative as well :)
The point of the t-shirt is to be clever, witty and intelligent.
If text is the only ingredient of your design, it should be tongue in cheek, and clever. For example: "010100110111011. It's a crypto thing, you wouldn't understand."
If it's graphical and text combined, then both should have a link with one another.
The t-shirts included can all serve as inspiration as they all represent designs I like a lot, and of which I believe can be used in this concept too.
The t-shirt is one-sided (front only).