US 9,813,250 B2
Combined authentication and encryption
Bryan D O'Connor, Atherton, CA (US); and Eugene Fooksman, Santa Clara, CA (US)
Assigned to WHATSAPP INC., Menlo Park, CA (US)
Filed by WhatsApp Inc., Mountain View, CA (US)
Filed on Nov. 19, 2015, as Appl. No. 14/945,649.
Application 14/945,649 is a continuation of application No. 14/045,192, filed on Oct. 3, 2013, granted, now 9,225,516.
Prior Publication US 2016/0087794 A1, Mar. 24, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 9/32 (2006.01); H04L 9/08 (2006.01)
CPC H04L 9/3271 (2013.01) [H04L 9/0819 (2013.01); H04L 9/0863 (2013.01); H04L 9/3234 (2013.01); H04L 9/3297 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
providing a device with a first unsolicited token during an authenticated first communication connection;
terminating the first authenticated communication connection;
receiving encrypted authentication data from the device;
generating a session key from the first unsolicited token;
determining whether the encrypted authentication data decryptable with the session key;
acknowledging to the device establishment of a second communication connection as a response to the receiving of the encrypted authentication data, if the encrypted authentication data decryptable with the session key; and
providing the device with a second token if the encrypted authentication data not decryptable with the session key.