| 摘要 |
Method of encyphering messages transmitted between interconnected networks (2, 8) via highways (6) using a specified network protocol, especially and for example the Internet protocol (IP), a device for communicating encyphered data between at least two items of equipment (3, 9) belonging to two different networks interconnected via highways using the specified network protocol, and an encyphering apparatus implementing the said method. The method is characterised in that the messages are encyphered whilst preserving in clear the "header" part of the message, allowing it to be conveyed via the highways. <IMAGE>
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