Software and data protection method, involves dynamically dearchiving secret encryption key from sub-keys at each usage of programs/data, and dynamically decrypting protected programs or data by decryption algorithm and secret key

摘要

The method involves generating a sub-key KP (10) relative to a user and/or a system, and generating a sub-key KE (8) depending on a secret encryption key K (7) and the sub-key KP (10). The secret encryption key is dynamically dearchived from the sub-keys at each usage of programs or data. The protected programs or data are dynamically decrypted in an electrically erasable programmable ROM by a decryption algorithm and the key K (7). Independent claims are also included for the following: (A) an application of a method to the protection and management of rights of the usage of encrypted software functionalities (B) a system for protecting storage units and in particular hard disk implementing a software and data protecting method.