| 摘要 |
The device functions by insertion of an external code, this device comprising a lock s and a key c each comprising calculation means capable of performing logical arithmetic operations, suitable for authorising access when, after introduction of the abovementioned external code, the calculation means 7 of the lock carry out processing on the abovementioned code introduced from the outside and a code contained by the lock s and when there is agreement between the results of the processing carried out by the calculation means s of the key and by the calculation means 7 of the lock, and to keep the access closed when this relationship does not exist. The device especially makes it possible to protect access to any file, data bank, information centre and program on any data-processing and videotext system including MINITEL. <IMAGE> |
