Patent ID: 7849313

Claim:
A method implemented by a mobile device in a system comprising said mobile device, a wireless network and a routing server coupled to the wireless network, the mobile device having a user interface and a plurality of communications applications and further having a messaging application, the mobile device having a first personal identification number, the method comprising: receiving an invitation via one of the communications applications, the invitation including a question; displaying the question; receiving through the user interface a received answer in response to the question; encrypting the first personal identification number; transmitting the received answer and the encrypted first personal identification number in response to the received invitation; receiving an encrypted second personal identification number in response to the transmitted received answer and first personal identification number; generating an encryption key using the received answer; and decrypting the encrypted second personal identification number using said encryption key, whereby peer-to-peer messages are sent and received by the mobile device using said messaging application, and wherein each transmitted peer-to-peer message contains the second personal identification number, each received peer-to-peer message contains the first personal identification number, and each peer-to-peer message is routed by the routing server based upon said personal identification numbers.