Method and apparatus for maintaining ephemeral keys in...

Details Method and apparatus for maintaining ephemeral keys in... Method and apparatus for maintaining ephemeral keys in...

2006-01-03

2010-02-09

Zand, Kambiz (Department: 2434)

Cryptography

Key management

Key escrow or recovery

C380S281000, C380S282000, C726S009000

Reexamination Certificate

active

07660423

ABSTRACT:
One embodiment of the present invention provides a system that maintains keys using limited storage space on a computing device, such as a smart card. During operation, the system receives a request at the computing device to perform an operation involving a key. While processing the request, the system obtains an encrypted key from remote storage located outside of the computing device, wherein the encrypted key was created by encrypting the key along with an expiration time for the key. Next, the system decrypts the encrypted key to restore the key and the expiration time, wherein the encrypted key is decrypted using a computing-device key, which is maintained locally on the computing device. Finally, if the expiration time has not passed, the system uses the key to perform the requested operation. Note that by storing the encrypted key in remote storage, the computing device is able to use the key without consuming local storage space to store the key.

REFERENCES:
patent: 6959390 (2005-10-01), Challener et al.
patent: 7409545 (2008-08-01), Perlman
patent: 7493661 (2009-02-01), Liu et al.
patent: 2002/0023215 (2002-02-01), Wang et al.
patent: 2002/0090091 (2002-07-01), Ng et al.
patent: 2007/0157032 (2007-07-01), Paganetti et al.
patent: WO 0229516 (2002-04-01), None
Publication: “A Revocable Backup System” by Boney and Lipton, In Proceedings 6thUsenix Security Conference, pp. 91-96, 1996.

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