On: Obama at SXSW: ‘Absolutist view’ on digital privac...

[plugnburn]

There still are some encryption schemes that can be run with nothing more than a pencil and paper. See SMSPP for example: https://gist.github.com/plugnburn/6b50ceee3a89893a9e48

You can also use straddling checkerboards if you can do some very simple math.