| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To easily transmit and receive encrypted fragment packets. <P>SOLUTION: A device includes: a processing section that, when transmitting encrypted packets obtained by encrypting, authenticating and capsule-processing a plain text packet in a tunnel mode, divides an encryption target area and authentication target area of the encrypted packet into a plurality of pieces to produce a plurality of encrypted fragment packets, and adds a tunnel header containing an identifier for identifying a turn to each of the plurality of encrypted fragment packets, while adding a predetermined number of rearward pieces of payload data in the previous encrypted fragment packet to a front of payload data in the next encrypted fragment packet redundantly; and a control section that subjects the plurality of encrypted fragment packets which are received in the tunnel mode to decoding, authentication and de-capsule processings, and produces a plurality of plain text fragment packets, having respectively, payload data corresponding to the plain text packet in which the identifier extracted from each tunnel header is written, so as to make the packet transmit to a receiving end. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
