Patent ID: 7616765
Filing Date: 2009-11-10
Classification: H04L

Abstract:
1. A method for generating shared information between a first communication device and a second communication device, which are connected by at least a first channel of relatively low reliability and a second channel of relatively high reliability, comprising: a) sending original information from the first communication device to the second communication device through the first channel, wherein the original information comprises a string of bits whose bit positions are relatively determined; b) setting reference bit positions to be used for generating shared information between the first communication device and the second communication device through the second channel, to generate provisionally shared information based on information received from the first communication device through the first channel; c) determining whether synchronization is established based on the setting of the reference bit positions, by comparing part of a first version of the provisionally shared information on the first communication device with corresponding part of a second version of the provisionally shared information on the second communication device through the second channel; d) when said determining step c) determines that synchronization is not established, changing the setting of the reference bit positions to regenerate provisionally shared information in said reference bit positions setting step b); and e) when said determining step c) determines that synchronization is established, generating the shared information based on present provisionally shared information.