Deriving a symmetric key from an asymmetric key for file encryption or decryption
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United States of America Patent
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Jun 3, 2008
Grant Date -
Apr 19, 2007
app pub date -
Dec 14, 2006
filing date -
Jan 27, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
One aspect relates to a process and associated device that provides a private key of an asymmetric key pair in a key device. A symmetric master key is derived from the private key of the asymmetric key pair. The symmetric master key is stored in a computer memory location. The symmetric master key is used to encrypt or decrypt a file encryption key. The file encryption key can encrypt or decrypt files. In another aspect, the user can still access the files even if a user deactivates the key device by encrypting or decrypting the file encryption key directly from the symmetric master key.
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