Patent ID: 8738916

Claim:
A method performed by a first communication device comprising: preparing an invitation to engage in peer-to-peer messaging for a second communication device, the invitation comprising an encrypted first personal identification number unique to the first communication device, the first personal identification number being encrypted using a public key of the second communication device and utilized by a peer-to-peer messaging system to exchange messages using a peer-to-peer messaging application; sending the invitation to the second communication device using a communication application different from the peer-to-peer messaging application; receiving from the second communication device, an acceptance message, the acceptance message including an encrypted second personal identification number unique to the second communication device, the second personal identification number having been encrypted by the second communication device using a public key of the first communication device; decrypting the encrypted second personal identification number using a private key corresponding to the public key of the first communication device; and performing at least one of sending a first peer-to-peer message to the second communication device using the second personal identification number, and receiving a second peer-to-peer message from the second communication device, the second peer-to-peer message having been sent using the first personal identification number.