Patent ID: 7133990

Claim:
A system for controlling access to protected data, said system comprising: storage means including a protected zone for storing the protected data, and a command input for denying or authorizing access to the protected data; protection means for controlling access to the protected data by selectively activating the command input of the memory; an internal key; and means for receiving an input key from the outside, wherein the protection means authorizes access to the protected data only when the internal key and the input key are identical, the protection means is connected to an internal link for loading the internal key and an external link for loading the input key, the protection means includes means of denying data communication for preventing a transfer of data from the internal link to the external link when the internal key is present on the internal link, the external link is a data input and output system governed by the JTAG protocol, and the means of denying data communication acts on a validation input of the JTAG protocol.