| 摘要 |
The invention relates to electronic security over a network, and in particular to a client/server arrangement. Each time a client 00, 05 wishes to access information, e.g. a web site, it generates a client identifier key (CIK) based on the software/hardware configuration of the client's terminal for verification at the sewer 37. Requests for information by the client take the form of a pseudo (or dummy) uniform resource locator (PURL), which appear the same as ordinary URLs but define tasks to be performed in response to the request rather than the address of the requested information. The sewer profiles the security level of the client and that of the requested information and determines whether the client should have access. If access is denied, instead of notifying the client of this outcome, the server generates and transmits a substitute dummy web page 42 which may contain harmless public information. In this way, an unauthorised client is unaware that the request has been unsuccessful.
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