| 摘要 |
A web server (1) responds to requests for information by accessing a first memory (9) to retrieve data required to generate a web page. The integrity of the retrieved data files is checked before generating the web page and, if necessary, the data file is repaired to correct any unauthorised modification, the repair process comprising access to a master copy of the file stored in a second memory (10) in read only form. Verification comprises decrypting a stored signature. The first memory can be a hard disc drive or the like providing rapid access for high speed operation. The relatively slow access time associated with the second memory in read only form can be tolerated since access is required only for repair purposes when a file cannot be verified. The server has application to providing secure services via the Internet where data files held in a server are likely to be open to attackers seeking to modify files for fraudulent purposes. |
