Method and apparatus for verifying the integrity of a smart card

Details Method and apparatus for verifying the integrity of a smart card Method and apparatus for verifying the integrity of a smart card

1994-03-28

1995-05-16

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

235437, 235441, G01R 2726, G06K 704

Patent

active

054164230

ABSTRACT:
A Contact Smart Card (3) is inserted in a contact card reader and its capacitance is measured by applying a square wave generated by an oscillator (1) to it via a resistor (4). The capacitance effect of the smart card (3) affects the amplitude of the output from the resistor (1) and the output is monitored in an amplitude detector (2) connected to receive the signal output from the resistor (4) and to compare it against a threshold level for the signal previously established and stored for an acceptable card.

REFERENCES:
patent: 3564343 (1970-03-01), Ditlow
patent: 4226361 (1980-10-01), Taylor
patent: 4433286 (1984-02-01), Capots et al.
patent: 4785166 (1988-11-01), Kushima
patent: 4792667 (1988-12-01), Chen
patent: 4985614 (1991-01-01), Pease et al.
patent: 5032708 (1991-07-01), Comerford et al.
patent: 5045674 (1991-09-01), Mita et al.
patent: 5122754 (1992-07-01), Gotaas
patent: 5146068 (1992-09-01), Ugawa et al.
patent: 5198645 (1993-03-01), Martin et al.

Affiliated with

Also associated with

Rating

Method and apparatus for verifying the integrity of a smart card 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 apparatus for verifying the integrity of a smart card, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for verifying the integrity of a smart card will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-640371