Patent ID: 8601274
Filing Date: 2013-12-03
Classification: H04L

Abstract:
1. A communication system for transmitting and receiving communication data together with signature data attached thereto for verifying the communication data, the system comprising: a transmission-side terminal that, each time M (a positive integer that is greater than or equal to 2; M>=2) pieces of communication data constituting one unit of communication data are transmitted, generates the signature data for the one unit of communication data consisting of M pieces of communication data lastly transmitted, divides the generated signature data into M pieces of divided signature data, and then sequentially transmits the M pieces of divided signature data, attached to M corresponding pieces of communication data, wherein each of the M pieces of divided signature data is transmitted, attached to a corresponding piece of communication data, each time the corresponding piece of the communication data is generated; and a reception-side terminal that, each time the M pieces of communication data constituting the one unit of communication data are received from the transmission-side terminal, reconstitutes the one unit of communication data from the M pieces of communication data received previous to the M pieces of communication data last received, reconstitutes the signature data from the M pieces of divided signature data attached to the M corresponding pieces of communication data constituting the one unit of communication data last received, and verifies the reconstituted one unit of communication data by using the reconstituted signature data.