Reading data from a smart card
First Claim
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1. A method of reading data from a smart card, the smart card having a microprocessor and a memory holding use-variable data, the method comprising:
- coupling a reader to the card to establish a data transmission path between the reader and the card;
accessing required use-variable data in said memory, and incorporating said accessed data as part of an answer-to-reset signal transmitted from the card to the reader.
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Abstract
A method of reading use-variable data from a smart card (1) includes selected data in the answer-to-reset signal sent from the card in response to a reset signal sent from a card reader (4). In this way a reader can be employed with inexpensive components and limited processing power since full implementation of a communication protocol is not required. An inexpensive key-fob (3) is provided for reading the value balance (7) of an electronic purse card, for example.
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Citations
17 Claims
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1. A method of reading data from a smart card, the smart card having a microprocessor and a memory holding use-variable data, the method comprising:
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coupling a reader to the card to establish a data transmission path between the reader and the card;
accessing required use-variable data in said memory, and incorporating said accessed data as part of an answer-to-reset signal transmitted from the card to the reader. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification