Cryptography – Key management
Reexamination Certificate
2005-08-02
2005-08-02
Song, Hosuk (Department: 2135)
Cryptography
Key management
C380S282000, C713S182000, C713S186000
Reexamination Certificate
active
06925182
ABSTRACT:
The private and public keys of users, as encrypted with a symmetric algorithm by using individual user identifying keys are stored at a network server, indexed or addressable by user ID, and are sent to the user equipment only when needed. The user identifying keys are determined by hashing the users' respective passphrases or biometric information. After use, the private key and user identifying key are not retained at the user equipment. The encrypted private key is transmitted via the network to the user equipment along with a document to be approved by the user (in the case where the private key is used for digital signature) and, at the user equipment, the received encrypted private key is decrypted using a key determined at the user equipment by hashing either the user's passphrase, which is entered by the user, or the user's biometric information which is obtained by measurement or scanning the user. The received document is modified or merely reviewed, and a digital signature signifying the user's approval, is formed as a hash of the approved document encrypted using the user's private key. The digital signature and document are transmitted to the server, where verification takes place.
REFERENCES:
patent: 5208858 (1993-05-01), Vollert et al.
patent: 5590199 (1996-12-01), Krajewski
patent: 5604801 (1997-02-01), Dolan et al.
patent: 5689565 (1997-11-01), Spies et al.
patent: 5732137 (1998-03-01), Aziz
patent: 5892828 (1999-04-01), Perlman
patent: 5903882 (1999-05-01), Asay et al.
patent: 5919257 (1999-07-01), Trostle
patent: 0725512 (1996-08-01), None
Applied Cryptography(Bruce Schneier, p. 174), Oct. 1996.
Bruce Schneier, Applied Cryptography, pp. 38-39, Sep. 1996.
Koninklijke Philips Electronics , N.V.
Song Hosuk
Thorne Gregory L.
LandOfFree
Administration and utilization of private keys in a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Administration and utilization of private keys in a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Administration and utilization of private keys in a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3454991