| 摘要 |
<p>A method of creating a protection file (Fig. 1A and Fig. 2A) for protecting an original computer file and a probabilistic method of detecting a viral intrusion (Fig. B and Fig. 2B) into an original computer file are disclosed. In order to create the protection file (16 or 116), in a preferred embodiment, the protection file is created by generating a random test string (12 or 112), comparing the testing string to the original computer file (10 or 110) wherein the test string is discarded in the event of a match and is kept in the event of a non-match, and storing a plurality of non-matching test strings to form the protection file. In the computer viral detecting method, the computer file to be screened for possible viral infection is compared to each of the test strings of the protection file, the computer file being screened is determined to be free of a viral infection if all of the test strings in the protection file do not match the file being screened. However, in the event of a match between a test string and the computer file being screened, then a change in the file being screened is detected.</p> |
