Cellular voice encryption

I need a hardware chip (or any other interface) that will connect to a NOKIA phone (we can pick a model together, another manufacturer is also possible), and encrypt all the voice data transfered to another device. This chip will be on both side phones of course. The chip will have to change the hash code and report the change in a secure way to the other chip on the other side. The user should be able to control when to enter this "secure" mode and when to bypass the chip and talk normally. The purpose of this developement is to secure the calls between a pre determined set of 2 cellular phones and avoid anyone else listening to the call. Requirements list 1. High quality (at least 128Bit) private key / public key encryption. 2. Smooth call audio on both sides of the call 3. Support call waiting calls. 4. Easy activation / deactivation of the encryption 5. Support non encrypted calls to phones that don't have the hardware. ## Deliverables 0) Complete design of hardware for manufacturing purposes. 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Any type of cellular phone we will agree on