Patent ID: 8171073

Claim:
A computer system connected to a data communications network, said system comprising: a first computer; a redundant second computer that is independent of the first computer; a computer-to-computer connection between the first computer and the redundant second computer enabling the first computer to match with the redundant second computer by comparing a first work result of the first computer with a second work result of the redundant second computer; and at least one computer-to-network connection to connect both the first and second computers to the data communications network independent from the computer-to-computer connection so that receipt of any data from the data communications network is limited to the first computer and transmission of any data to the data communications network is limited to the redundant second computer; wherein at least an initial processing of the data received from the data communications network is limited to the first computer, wherein the first computer is configured to convert, transmit and to store in the redundant second computer non-verified or non-verifiable data received by the first computer only in non-processable form, and a virus is detected on the first computer by a comparison of the first and second work results, where the first computer is restored to a virus-free state by copying a state of the redundant second computer onto the first computer.