Technique for split knowledge backup and recovery of a...

Details Technique for split knowledge backup and recovery of a... Technique for split knowledge backup and recovery of a...

2011-03-29

2011-03-29

Dinh, Minh (Department: 2432)

Cryptography

Key management

Key escrow or recovery

C380S283000, C380S279000

Reexamination Certificate

active

07916871

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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Schneier et al., “Applied Cryptography,” pp. 71-73.

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