CC3000 Smart Config - transmitting SSID and keyphrase
http://depletionregion.blogspot.com/2013/10/cc3000-smart-config-transmitting-ssid.html [depletionregion.blogspot.com]
2018-09-20 18:29
So let’s start at the start - we have a problem - we want to send two pieces of information, an SSID and the keyphrase, from one party that is already a member of the wifi network to an external party who can monitor all the encrypted wifi traffic but who cannot decrypt it.
So the solution to our problem is to encode the information in the size of the packets sent (the actual content is irrelevant). The party on the secured network just sends UDP packets with particular lengths to another party on the network. That the other party is not interested in receiving the packets is not important.
I believe this is possible. I am amazed it’s actually done.
source: solar