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With more computing platforms connected to the Internet each day, computer system security has become a critical issue. One of the major security problems is execution of malicious injected code. In this paper we propose new processor extensions that allow execution of trusted instructions only. The proposed extensions verify instruction block signatures in run-time. Signatures are generated during a trusted installation process, using a multiple input signature register (MISR), and stored indoi:10.1145/1055626.1055641 fatcat:uazx2ahuwrdjlbi7heap46gdhq