Systems and methods for encrypted mobile voice communications

A method of establishing a registration between a server and a Voice over Internet Protocol (VoIP) application on a mobile device having an associated phone number, the method comprising:

• at a mobile device, using a server encryption key to encrypt registration information, wherein the registration information includes at least one of an encryption key for a VoIP application and a secure identification code known to the server and provided to a user of the mobile device;
• and
• using a short messaging service (SMS) message or multimedia messaging service (MMS) message to send the encrypted registration information from the mobile device to the server, wherein the SMS or MMS message is originated at the mobile device and thereby provides to the server the telephone number associated with the mobile device for comparison to telephone numbers known to the server;
• wherein the encrypted registration information can be decrypted at the server.

A system for secure mobile voice communication, the system comprising:

• a software module configured to run as an application on a mobile device, wherein the software module is configured to encrypt an SMS message or an MMS message via an encryption;
• and
• a gateway comprising a server computer configured to communicate with the mobile device, wherein the gateway is configured to receive the encrypted message from the mobile device and to determine a phone number of the mobile device from the SMS or MMS message originated by the mobile device;
• wherein the software module on the mobile device is configured to register with the gateway;
• wherein the registration with the gateway comprises at least one of the phone number of the mobile device being a member of a whitelist and configuring the software module with a unique identification code provided to a user for input to the gateway via the mobile device;
• wherein the whitelist comprises a list of mobile device phone numbers authorized to be registered with the gateway;
• and
• wherein the gateway and software module exchange an encryption key for voice communication between the gateway and the mobile device.

A method of establishing a registration for secure communication between a server and an application on a mobile device, wherein the mobile device has an associated phone number, the method comprising:

• with the application, creating registration information including at least one of an encryption key for encrypted communication between server and the application and a secure identification code;
• with the mobile device, sending to the server a first short messaging service (SMS) message or multimedia messaging service (MMS) message originated by the mobile device and thereby revealing the phone number to the server;
• with the server, verifying the phone number of the mobile device originating the SMS or MMS message against a whitelist to authorize a registration between the mobile device and the server;
• if the registration is authorized, receiving a code sent by the server to the application on the mobile device via a second SMS message or MMS message;
• and
• without user intervention, extracting the code from the second SMS or MMS message and sending at least one of the registration information and the code from the mobile device to the server.