Method, apparatus and device for enciphering messages transmitted between interconnected networks
US5583940A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1994 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Sep 23, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L63/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of enciphering messages transmitted between at least two networks (2, 17) interconnected via at least one highway (8), the interconnected networks (2, 17) using the Internet protocol (IP, as network layer protocol and the TCP or UDP protocol, as transport layer protocol, the highway (8) using a specified network layer protocol, each message comprising a plurality of headers (73-76), including an IP header (75) and a TCP or UDP header (76, 80, 81), and data (77). The specified network layer protocol of the highway is the Internet protocol (IP). For each of the messages, at least a part (82, 83, 84, 85) of the TCP or UDP header (76, 80, 81) is enciphered at the same time as the data (77) and the IP header (75) is plain (non enciphered) to enable the transmission of the message by the highway according to the Internet protocol (IP).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.