Patent ID: 7483993
Filing Date: 2009-01-27
Classification: G06F,H04L

Abstract:
1. A system for preventing infection of a host system by a virus, the system comprising a computer readable storage medium having computer program instructions encoded therein, the computer program instructions comprising: a memory module configured to store a time stamp indicating a time at which a computer code was introduced to the host system; and an access control module coupled to the memory module and configured to: receive an access control message including an access control time, wherein the access control time is expressed as a duration of time; prevent execution of the computer code on the host system when the time stamp indicates a time within the duration of time expressed by the access control time; receive a second access control message subsequent to the access control message previously received, the second access control message including a second access control time representing a shorter duration of time than the access control time of the access control message previously received; and responsive to receiving the second access control message, allow execution of a computer code whose execution had been prevented responsive to receiving the access control message previously received.