Motorola Corporation

Craig R Balogh

Douglas Allan Hardy

Steven R Tugenberg

Timothy Gerard Hall

Craig Robert Fossey

William Chun-Hung Yip

George M Barney

A system (,) transmits a digital data stream (,) using a lossy compression service (,) having a communication path (,) through which compressed signals propagate. The system includes a data conditioner (,) configured to condition the received digital data stream (,) to produce data subsets (,). A frame generator (,) expands each of the data subsets (,) to generate distinct signal sets (,). The distinct signal sets (,) are expressed in a data size greater than the data subsets (,) to compensate for lossy compression cause by the lossy compression service (,). A transmitter is in communication with the frame generator (,) and transmits digitized ones of the distinct signal sets (,) in frames of a digital bit stream (,) over the communication path (,).

Method and system for data transmission using a lossy compression service

A system and method allows portable, encrypted data to be accessible through multiple hosts, including new hosts (14), without requiring a secure link to the new hosts. A split key encryption system encrypts (52) data and stores the encrypted data on a portable device (10). A split of the encryption key is stored (54) in the portable device (10), and another split of the key is stored (54) in a home host (12) . A password-modified key is then made (58) by combining a password with the encryption key. This password-modified key is then reduced (58), with one split being stored on the host (12) and another split stored on the portable device (10) . Data can be accessed with a new host (14) by transferring (78) the host password-modified split to the new host (14) and entering (80) the password into the portable device (10).

Encryption method and system for portable data

A method for establishing a secure communications link between first and second terminals includes a step of exchanging a first message. The first message contains information describing encryption devices and communications modes available within the terminals and user authentication information. The method also includes a step of selecting, in at least one terminal, a common key generation and ciphering algorithm. The method further includes steps of exchanging a second message for providing data to form traffic keys, exchanging a third message for synchronizing secure communications and initiating secure communication.

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Mesa, AZ, United States of America

Craig R Balogh