Patent ID: 8181034
Filing Date: 2012-05-15
Classification: G06F

Abstract:
1. A system, comprising: an external memory operative to store data therein, the data including a plurality of sections, the data including an executable computer program, at least part of the data being signed with a primary RSA asymmetric signature, the at least part of the data including at least some of the sections; an internal memory operationally connected to the external memory; a processor arrangement operationally connected to the internal memory, the processor arrangement includes a transfer module, an authentication module, and a signature module; and an integrated circuit having disposed thereon the internal memory and the processor arrangement, the integrated circuit being operationally connected to the external memory, the external memory not being on the integrated circuit, wherein during a preliminary procedure: wherein, prior to utilizing a selected one of the sections of the data: the transfer module is operative to transfer the selected section from the external memory to the internal memory; and the authentication module is operative to authenticate the symmetric signature of the selected section using the first secret and, wherein the processor arrangement includes: a validity status module to identify the selected section as valid if the symmetric signature of the selected section is authentic; and an execution module to utilize the selected section of the data only if the selected section is valid, the validity status module being operative to invalidate the selected section, if the content of the selected section is changed while stored in the internal memory.