| 摘要 |
A multi-level security system prevents unauthorized use of a computer. A program resident on the computer and implements a user-validation procedure. A key device carries a first serial number and an encryption key. A second serial number is stored in said computer, the second serial number being the serial number of a device internal to the computer. A mass storage device installed in said computer stores a validation record. The validation record comprises an unencrypted portion and an encrypted portion, the unencrypted portion including a copy of said first serial number and said encrypted portion including a copy of said second serial number and a user personal identification number. The key device is interfaced to the computer. The first serial number and the encryption key are read from said key device in order to gain authorized use of said computer. The key device may be removed from the computer after authorized use of the computer has been gained, and during operation of the computer.
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