Cryptography – Communication system using cryptography – Data stream/substitution enciphering
Reexamination Certificate
2006-05-02
2006-05-02
Peeso, Thomas R. (Department: 2132)
Cryptography
Communication system using cryptography
Data stream/substitution enciphering
C380S260000, C380S265000, C380S268000
Reexamination Certificate
active
07039185
ABSTRACT:
A closed system meter that secures the link between the accounting device and printer utilizing a Linear Feedback Shift Register (LFSR) based stream encryption is provided. The accounting device includes an LFSR that comprises a plurality of stages, with one or more taps that are passed through a logic gate to provide a “feedback” signal to the input of the LFSR, to generate a pseudo-random pattern output. Preferably, a Shrinking Key Generator (SKG) is utilized to further ensure privacy of the data. The output data from the accounting unit is encrypted utilizing the output from the LFSR and sent to the printing device. The printing device includes a similar LFSR, which is utilized to decrypt the output data from the accounting unit and enable printing.
REFERENCES:
patent: 4341925 (1982-07-01), Frosch et al.
patent: 4629871 (1986-12-01), Scribner et al.
patent: 4639548 (1987-01-01), Oshima et al.
patent: 4641346 (1987-02-01), Clark et al.
patent: 4660221 (1987-04-01), Dlugos
patent: 4813802 (1989-03-01), Gilham et al.
patent: 4813912 (1989-03-01), Chickneas et al.
patent: 4934846 (1990-06-01), Gilham
patent: 5293465 (1994-03-01), Abumehdi et al.
patent: 5579485 (1996-11-01), Edgar et al.
patent: 6166650 (2000-12-01), Bruwer
patent: 6201870 (2001-03-01), Medard et al.
patent: 0376573 (1990-07-01), None
patent: 0393896 (1990-10-01), None
Campagna Matthew J.
Ryan Jr. Frederick W.
Chaclas Angelo N.
Gurshman Grigory
Lemm Brian A.
Peeso Thomas R.
Pitney Bowes Inc.
LandOfFree
Method and system for securing a printhead in a closed... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system for securing a printhead in a closed..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for securing a printhead in a closed... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3533434