| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a software download system via a network capable of fulfilling all the security requirements of privacy, the authentication of the called party, the guarantee for non-alteration, and legality. <P>SOLUTION: The validity of terminal identifier ID preliminarily registered in each terminal 30 belonging to a DL server 10 is judged so that the authentication of the called party can be accurately executed. Also, download software 11An from the server 10 to the terminal 30 is encrypted by a cryptographic key generated each time, and the cryptographic key is encrypted by a terminal key generated each time from the terminal 30, and they are both downloaded to the terminal 30 so that the privacy of the download software 11An can be sufficiently ensured. In addition, whether or not electronic signature in the downloaded encrypted software is valid is confirmed so that non-alternation can be guaranteed, and a version number in the download software data 11An is inspected so that the legality of the version level can be guaranteed. <P>COPYRIGHT: (C)2003,JPO</p> |
