Robert David Frith

US Patent:

56968809, Dec 9, 1997

Filed:

Jun 26, 1995

Appl. No.:

8/494745

Inventors:

David T. Gustafson - Gilbert AZ
Richard G. Shepherd - Scottsdale AZ
Robert D. Frith - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G10L 500

US Classification:

395 282

Abstract:

The authentication method established a communication link between the calling and called users (14). The calling and called parties exchange voice identification data (22). The calling and called parties determine if the voice identification data compares (26,30). If voice identification data compares, a secure call is enabled (32). If the voice identification data does not compare the communication link is terminated (20).

US Patent:

59434260, Aug 24, 1999

Filed:

Sep 22, 1997

Appl. No.:

8/934691

Inventors:

Robert David Frith - Scottsdale AZ
Larry Charles Puhl - Sleepy Hollow IL
Ezzat A. Dabbish - Cary IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 900

US Classification:

380 25

Abstract:

A communication network (10) includes any number of interconnected nodes (20), including a sending node (22), a sending gateway (24), a receiving gateway (26), and a destination node (28). A low capacity or expensive communication channel (30) resides between the sending and receiving gateways (24, 26). An original digitally signed message is sent from the sending node (22) toward the destination node (28). When the original message arrives at the sending gateway (24), the original signature is verified. If verified, the sending gateway (24) shrinks the original message into a reduced message and re-signs the message with a gateway digital signature before sending the message onward through the communication channel (30) toward the destination node (28). The destination node (28) verifies the gateway digital signature against the reduced message and is not required to de-compress the reduced message into a precise duplicate of the original message.