I would say this is more of a steganography challenge than a cryptography challenge per-se. https://en.wikipedia.org/wiki/Steganography https://en.wikipedia.or

I would say this is more of a steganography challenge than a cryptography challenge per-se. https://en.wikipedia.org/wiki/Steganography https://en.wikipedia.org/wiki/Steganography http://www.instructables.com/id/How-to-hide-one-image-in-another-An-introduction-/ http://www.instructables.com/id/How-to-hide-one-image-in-ano... If common image formats get through, then yes, there is a network broadcast format that you can use to securely communicate through the great firewall.