SOFTWARESCHUTZSYSTEM

摘要

A system for protecting software that can be executed on a computer machine, the system being of the type in which the software is associated with a memory card for insertion in a reader connected to the computer machine. The software stores a public key, and periodically generates a pseudo-random number. A first algorithm is implemented by using the public key on information received from the reader. The result of implementing the first algorithm is compared with the pseudo-random number. Execution of the software is interrupted in response to such comparison. The card has protected storage means for storing an associated private key and means for implementing a second algorithm using the private key upon receiving information issued by the computer machine, thereby obtaining encoded information. The encoded information is transmitted from the card to the computer machine.