Technique for split knowledge backup and recovery of a cryptographic key
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United States of America Patent
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Mar 29, 2011
Grant Date -
Feb 7, 2008
app pub date -
Feb 21, 2007
filing date -
May 26, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
In a secure cryptographic environment, a private key in a private/public key cryptographic scheme needs to be backed up and recovered in case of a loss or corruption of the private key. To back up the private key, multiple key segments are generated based on the private key which are distributed to a corresponding number of trusted individuals, each of whom has knowledge of only his or her key segment. The key can be restored only when all of the trusted individuals provide the respective key segments, based on which the original private key is reconstructed. In addition, each trusted individual is uniquely identifiable by a personal identification number. Advantageously, the private key which is secret can be backed up and restored without any individual having knowledge of the full key.
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