Non-volatile storage device with forgery-proof permanent storage option

摘要

The invention is related to non-volatile storage devices. More precisely, the invention is related to non-volatile storage devices allowing for storing of data and for altering of already stored data. The invention proposes a non-volatile storage device comprising a storage unit (FM), means for receiving an access change indication (CON) and means for changing access to said storage unit (WP) in response to said access change indication wherein access prior to reception of said access change indication is such that data can be stored in said storage unit (FM) and already stored data can be altered and access after said access change is such that said at least some of already stored data is unalterable. This makes use of non-volatile storage devices even more flexible as it combines the advantages of permanent, fogery-proof storage with the advantages of erasable storage.