| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform encryption communication of divided IP packets without increasing a transmission data amount. <P>SOLUTION: A transmitting-side host 1 comprises an encryption unit 2 and a receiving-side host 3 comprises a decryption unit 4. The encryption unit 1 comprises: IPsec encryption processing 21; an identifier information copying means 22 for copying identifier information in the IP header of an IP packet into an area of copy identification information secured at a prescribed position of the IP packet; a header modifying means 23 for modifying the identifier information as one non-divided IP packet; and a communication data transmitting means 24 for transmitting the modified IP packet. The decryption unit 4 comprises a header recovery means 41 for recovering the IP header of the IP packet from the encryption unit to the IP header before the modification on the basis of the copy identifier information; an identifier information deleting means 42 for deleting the copy identifier information after the IP packet is decrypted; and an IPsec decryption processing 43. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
