Data processing: financial – business practice – management – or co – Business processing using cryptography – Secure transaction
Reexamination Certificate
2011-01-25
2011-01-25
Augustin, Evens J (Department: 3621)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Secure transaction
C705S075000, C705S014230, C705S035000, C705S042000, C705S070000, C902S008000, C902S022000, C902S024000
Reexamination Certificate
active
07877331
ABSTRACT:
Digital cash token protocols use a combination of blind digital signatures and pseudonym authentication with at least two pairs of public and private keys. A user is provided with one master pair of private and public keys and as many pseudonym pairs of private and public keys as desired. The resulting digital cash token based hybrid protocols combine the advantages of blind digital signature and pseudonym authentication. Blind digital signatures based on the master pair of keys are used to withdraw digital cash from the user's bank account under the user's real identity. A pseudonym pair of keys is used for converting digital cash into digital cash tokens by a digital cash issuer. All pseudonyms can be used for spending the digital cash tokens. These protocols ensure anonymity when withdrawing digital cash from the user's account under the user's real identity in addition to providing pseudonym authentication when spending digital cash tokens under a pseudonym.
REFERENCES:
patent: 4914698 (1990-04-01), Chaum
patent: 4926480 (1990-05-01), Chaum
patent: 4947430 (1990-08-01), Chaum
patent: 5521980 (1996-05-01), Brands
patent: 5606617 (1997-02-01), Brands
patent: 5666416 (1997-09-01), Micali
patent: 5768385 (1998-06-01), Simon
patent: 5812670 (1998-09-01), Micali
patent: 5901229 (1999-05-01), Fujisaki et al.
patent: 6076078 (2000-06-01), Camp et al.
patent: 6266704 (2001-07-01), Reed et al.
patent: 6976162 (2005-12-01), Ellison et al.
patent: 2001/0049667 (2001-12-01), Moribatake et al.
Brown et. al. “Prject eWallet” All pages. Retrieved Aug. 30, 2010. <http://www.cs.utah.edu/˜bbrown/cs4500/eWalletFinal.pdf>.
“Digital Cash” All pages. Retrieved Aug. 30, 2010. <http://www.cs.bham.ac.uk/˜mdr/teaching/modules06
etsec/lectures/DigitalCash.html>.
Tewari et. al. “Reusable Off-line Electronic Cash Using Secret Splitting” All pages. Retrieved Aug. 30, 2010. <http://www.scss.tcd.ie/publications/tech-reports/reports.98/TCD-CS-1998-27.pdf>.
Chaum et. al. “Untraceable Eletronic Cash” All pages. Retrieved Aug. 30, 2010. <http://people.dsv.su.se/˜matei/courses/IK2001—SJE/Chaum90.pdf>.
Al-Herz Ahned Ibrahim
Ibrahim Mohammad K.
Augustin Evens J
Cheung Calvin K
King Fahd University of Petroleum & Minerals
Lowe Hauptman & Ham & Berner, LLP
LandOfFree
Token based new digital cash protocols with combined blind... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Token based new digital cash protocols with combined blind..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Token based new digital cash protocols with combined blind... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2656084