COMMUNICATION APPARATUS, SERVER APPARATUS, COMMUNICATION PROGRAM, AND DATA

摘要

<P>PROBLEM TO BE SOLVED: To provide a communication apparatus capable of specifying a node that illegally alters a piece distributed in a content distribution system. Ž<P>SOLUTION: The communication apparatus includes: a data receiver 514 for receiving first signature target information containing first apparatus identification information identifying another communication apparatus and a piece and a first electronic signature generated with respect to the first signature target information; a specific information storage 510 for storing second apparatus identification information identifying the communication apparatus and a non-public key assigned to the communication apparatus; an electronic signature generator 521 for generating a second electronic signature with respect to second signature target information containing the first signature target information, the first electronic signature and the second apparatus identification information while using the non-public key; and a data transmitter 515 for transmitting the second signature target information and the second electronic signature. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž