Method and system of reconstructing a secret code in a vehicle for performing secure operations
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United States of America Patent
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Aug 5, 2014
Grant Date -
Feb 6, 2014
app pub date -
Aug 2, 2012
filing date -
Aug 2, 2012
priority date (Note) -
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Abstract
A method is provided for constructing a secret code in a processing unit when in communication with a portable security unit. Mutual authentication messages are exchanged between a linked portable security unit and processing unit. A first portion of the secret code is communicated to the processing unit. The processing unit combines the first portion and a second portion of the secret code stored in the non-volatile memory of the processing unit. The secret code is stored in a volatile memory of the processing unit. A secure operation is performed using the secret code. The portable security unit is de-linked from the processing unit. At least a portion of the secret code is deleted from the volatile memory of the processing unit.
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