System and method for restoring a secured terminal to default status
First Claim
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1. A system for restoring a terminal having a display to a default condition when a clear file is downloaded to the terminal, comprising:
- a random number generator included in the terminal; and
a file authentication arrangement for authenticating a clear file that is downloaded to the terminal from outside the terminal.wherein said terminal is arranged to execute a clear instruction in said clear file upon authentication of said clear file.wherein said clear file includes a random number generated by said random number generator and displayed on said display so that the random number can be placed into the clear file before being downloaded to the terminal, andwherein said random number is changed each time said terminal is restored to a default condition so as to prevent replay attacks resulting from copying of the clear file.
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Accused Products
Abstract
Upon receiving a request to clear or reset a terminal, the terminal displays a random number, the random number is placed in a regular file and signed by a private key to created a signed clear file, the clear file is authenticated, and the original random number is replaced by a new random number, thereby ensuring the authenticity of the clear or reset request while protecting the terminal from replay attacks.
21 Citations
16 Claims
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1. A system for restoring a terminal having a display to a default condition when a clear file is downloaded to the terminal, comprising:
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a random number generator included in the terminal; and a file authentication arrangement for authenticating a clear file that is downloaded to the terminal from outside the terminal. wherein said terminal is arranged to execute a clear instruction in said clear file upon authentication of said clear file. wherein said clear file includes a random number generated by said random number generator and displayed on said display so that the random number can be placed into the clear file before being downloaded to the terminal, and wherein said random number is changed each time said terminal is restored to a default condition so as to prevent replay attacks resulting from copying of the clear file. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of restoring a terminal to a default condition, comprising the steps of:
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generating a random number and storing the random number in a terminal; displaying the random number on a display of the terminal; placing the random number in a regular file following display of the random number; digitally signing the regular file after placement of the random number to create a digitally signed clear file; downloading the digitally signed clear file to the terminal; authenticating the digitally signed clear file by comparing the digital signature with a corresponding value based on the stored random number; restoring the terminal to a default condition; generating a new random number and replacing the stored random number with the new random number after restoring the terminal to a default condition so as to prevent replay attacks resulting from copying of the digitally signed clear file. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification