Patent ID: 8601275
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×N (M, N are positive integers such that M≧2 and N≧2 i.e., M and N are equal to or greater than 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×N pieces of communication data last transmitted, divides the generated signature data into M pieces of divided signature data, and then sequentially transmits the M pieces of divided signature data repeatedly in N rounds, cyclically attached to M×N corresponding pieces of communication data, wherein each of the M pieces of divided signature data is a transmitted in each round, 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×N 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×N pieces of communication data received previous to the M×N pieces of communication data constituting the one unit of communication data last received, reconstitutes the signature data from the M pieces of divided signature data cyclically attached to the M×N 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.