Communications: electrical – Selective – Intelligence comparison for controlling
Reexamination Certificate
2005-11-01
2005-11-01
Holloway, III, Edwin C. (Department: 2635)
Communications: electrical
Selective
Intelligence comparison for controlling
C340S010400
Reexamination Certificate
active
06960981
ABSTRACT:
In a method of detecting redirection or interception during a bi-directional non-contact making data transmission, the attenuation (A1) of the amplitude over the forward path is compared with the attenuation (A2) of the amplitude over the return path. The attenuation (A1) over the forward path is transmitted in encoded form with the reply signal. If the attenuation values determined thereby are of the same magnitude, then the likelihood of a redirecting process can be excluded. In order to additionally increase the security of the system, the carrier frequency (F2) of the interrogation signal can also be compared with the carrier frequency (F21) of the reply signal. The signals can also incorporate an ID code.
REFERENCES:
patent: 4157454 (1979-06-01), Becker
patent: 4672375 (1987-06-01), Mochida et al.
patent: 4783658 (1988-11-01), Nakano et al.
patent: 4973958 (1990-11-01), Hirano et al.
patent: 5579373 (1996-11-01), Jang
patent: 5600726 (1997-02-01), Morgan et al.
patent: 5724428 (1998-03-01), Rivest
patent: 5736935 (1998-04-01), Lambropoulos
patent: 5742236 (1998-04-01), Cremers et al.
patent: 5963141 (1999-10-01), Takamatsu
patent: 6140914 (2000-10-01), Mueller et al.
patent: 6208239 (2001-03-01), Muller et al.
patent: 6218932 (2001-04-01), Stippler
patent: 6483425 (2002-11-01), Avenel
patent: 6747545 (2004-06-01), Nowottnick et al.
patent: 2001/0014117 (2001-08-01), Blatz et al.
patent: 4407966 (1995-09-01), None
patent: 19718764 (1998-08-01), None
patent: 19836957 (1999-09-01), None
patent: 19827722 (1999-12-01), None
patent: 10005503 (2001-08-01), None
patent: 0848123 (1988-06-01), None
patent: WO 90/09707 (1990-08-01), None
Bosch, Robert, On-Board Electronics, Nov. 11, 2000, Bosch Pty. Ltd., RBAU/EGV001127, p. 11.
K. S. Khangura et al.; “Vehicle anti-theft system uses radio frequency identification”, IEEEColloquium on Vehicle Security Systems; Oct. 1993, pp. 4/1-4/7; Fig. 4 with description.
Ansaf Alrabady et al. “Some Attacks Against Vehicles' Passive Entry Security Systems and Their Solutions”; IEEE Transactions on Vehicular Technology, vol. 52, No. 2, Mar. 2003, pp. 431-439.
ATMEL Germany GmbH
Fasse W. F.
Fasse W. G.
Holloway III Edwin C.
LandOfFree
Detecting redirection during data transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Detecting redirection during data transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detecting redirection during data transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3484759