Abstract: A portable memory device for use with a host device includes an array of non-volatile memory and a memory controller for performing memory access operations. A processor issues an authorization challenge to a host device prior to enabling external access to the memory. Upon receipt of a valid authorization from the host device, access is enabled. In one embodiment, the processor preconditions at least one signal in the interface between the host device and the memory controller. The preconditioning results in a desynchronization of synchronized signals applied at the memory device interface, thereby interfering with proper operation of the memory device. Attempts to access the memory device prior to authorization lead to intentional corruption of data stored in the memory. In alternative embodiment, a secure, machine-readable digital storage device is implemented as a boot device for a host machine.

Abstract: A portable memory device for use with a host device includes an array of non-volatile memory and a memory controller for performing memory access operations. A processor issues an authorization challenge to a host device prior to enabling external access to the memory. Upon receipt of a valid authorization from the host device, access is enabled. In one embodiment, the processor preconditions at least one signal in the interface between the host device and the memory controller. The preconditioning results in a desynchronization of synchronized signals applied at the memory device interface, thereby interfering with proper operation of the memory device. Attempts to access the memory device prior to authorization lead to intentional corruption of data stored in the memory.