Cryptography – Key management – Key escrow or recovery
Patent
1997-10-20
2000-12-12
Hayes, Gail O.
Cryptography
Key management
Key escrow or recovery
713165, 380277, H04L 908
Patent
active
061608912
ABSTRACT:
A key such as a private key or key password of a private key is encrypted for storage, and may be decrypted if the private key becomes lost or unavailable. The key is encrypted by encoding, for example, by hashing, private information such as mother's maiden name and social security number, and the result is used as a key to encrypt the private key using DES or another symmetric encryption technique. The encrypted key is again encrypted, for example using asymmetric encryption, using the public key of a trusted party such as the certificate authority that generated the private key. The result may be stored as a key recovery file by the principal of the private key or another party. To decrypt the key recovery file, the private key corresponding to the public key used to encrypt the key recovery file is used to decrypt the key recovery file, for example by asymmetric decryption. The result is symmetrically decrypted using a key obtained by encoding, for example, by hashing, the private information in the same manner as was used to encrypt the key. The result of this decryption is the key.
REFERENCES:
patent: 5237610 (1993-08-01), Gammie et al.
patent: 5481613 (1996-01-01), Ford et al.
patent: 5757913 (1998-05-01), Bellare et al.
Hayes Gail O.
Song Ho Sulc
Sun Microsystems Inc.
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