Method and apparatus of enciphering and deciphering data using keys enciphered and deciphered with other keys
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United States of America Patent
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-
Feb 12, 2002
Grant Date -
Sep 6, 2001
app pub date -
Jun 26, 1997
filing date -
Jun 28, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
On a recording medium, first information obtained by enciphering data with the first key and second information obtained by enciphering the first key with each of the predetermined second keys are recorded. A deciphering method is characterized by comprising the steps of inputting the first and second information, deciphering the first key using at least one of the second keys, determining by a specific method that the obtained first key is correct, and then deciphering the data using the first key to obtain the data.
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