Patent ID: 7228430
Filing Date: 2007-06-05
Classification: G06F

Abstract:
1. A Security system for preventing unauthorized use of a main computer device having an authorized user, comprising: an extractable security piece which can be removed from the main computer device by the authorized user, wherein the extractable security piece includes an extractable main private key and a main PC public key; a PC security area, which is a non-extractable part of said main computer device, wherein said PC security area includes a PC private key and an extractable main public key that constitute a Public Key Infrastructure (PKI) with, respectively, the extractable main private key and the main PC public key; and processing means in said extractable security piece and in said PC security area for mutual authentication of said extractable security piece and said PC security area, wherein said extractable main private key identifies said extractable security piece to said PC security area and said PC private key authenticates said PC security area to said extractable security piece after said extractable security piece, which had been previously removed from said PC security area, is reinserted in said PC security area to enable the authorized user to access data stored in said main computer device, wherein said extractable security piece and said PC security area each comprise a PKI checker for encrypting and authenticating data exchanged between said PC security area and said extractable security piece when said extractable security piece is reinserted in said main computer device, said extractable security piece PKI checker encrypting extractable security piece data with said main PC public key and said PC security area PKI decrypting the encrypted extractable security piece data with said PC private key, and said PC security area PKI checker encrypting PC security area data with said extractable main public key and said extractable security piece PKI checker decrypting the PC security area data with said extractable main private key.