| 摘要 |
The present invention provides a method of providing a secure communications link comprising receiving a request for a secure communications link, selecting one of a plurality of predetermined encryption methods for communicating over said link dependent on security level data, and establishing said communications link using said selected encryption method. The security level data may comprise information relating to the sensitivity of the data to be transmitted and the processing capability of the requesting unit and receiving unit. The security level data may alternatively comprise a parameter generated from this information. The information or parameter may be sent with the request, or sent later on request. Processing is carried out in security modules located in the transmitter and receiver, or at an intermediate node. |
