| 摘要 |
The present invention relates to an optional system for protecting access to a computer, the method of initialising and of implementing the protection and the use of the protection system in a method of machine access. The protection system is characterised in that the processor (1) of the computer is associated with a read-only memory (22, 23) containing two basic input/output system programmes (BIOS); a first programme (BIOS1) comprising a method of initialising and implementing the protection following the choice of protection option; a second programme (BIOS2) comprising at least one method of access to the main protected resources and making use of a card (CB); a random-access memory (M) associated with a back-up and protection power supply (29), containing a matrix of value pairs (Ei, Ki) arranged as an index table. The value pairs are used in a method of machine access by the BIOS2; and means of selecting solely the use of the second programme BIOS2, subsequent to the choice of protection option. <IMAGE> |
