System and method for sign mask encryption and decryption
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United States of America Patent
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Sep 5, 2006
Grant Date -
Nov 13, 2003
app pub date -
May 9, 2002
filing date -
May 9, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
In general, one embodiment of the invention involves a method to protect the integrity of the sign mask. The method involves computing a key shared by a plurality of software modules employed within an image display device and encrypting a sign mask with the shared key. The sign mask is used for scrambling a bit stream prior to its transmission along with the encrypted sign mask. The encrypted sign mask is decrypted at the destination in order to descramble the scrambled bit stream.
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