Abstract: A technique for preventing illegal invocation of software programs is disclosed. In one particular exemplary embodiment, the technique may be realized as a method for preventing illegal invocation of software programs in a computer system having a first program that invokes a second program. The method may comprise generating a first digital signature for the first program. The method may also comprise making one or more permitted digital signatures available to the second program. The method may further comprise generating a first parameter for the first program, wherein the first parameter is cryptographically computed based on the first digital signature, a memory address for storing the first parameter, and a first system code that is unique to the computer system. The method may additionally comprise making the first parameter available to the second program.

Abstract: Method and system for encrypting streamed data employing fast set-up single use keys and self-synchronization. A transmitting handset produces a bitstream of voice data containing the session key and encrypted by an encryption signal based upon the session key. A receiving handset decrypts the incoming bitstream using the encryption signal and recognizes the session key, thereby establishing synchronization. The session key is derived from a seed by applying a first function to the seed. Following the call, the session key is converted into a new seed by application of a second function and the new seed is stored for use in the next call.