Method of modifying the functions performed by a command set of a smart card
First Claim
Patent Images
1. A smart card comprising:
- a processor having a command set; and
a memory for storing (1) a first file, (2) a first attribute table associated with the first file and with the commands of the command set, and (3) computer code for;
determining a position in the first attribute table corresponding to a command of the command set to be modified, andmodifying an attribute at the position in the first attribute table corresponding to the command of the command set to be modified without modifying any other attributes in the first attribute table.
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Abstract
A method is disclosed of modifying and/or extending the command set (READ, WRITE) of a smart card. Use is made of the attribute tables (100, 200, 300) associated with certain files and with the commands of the existing command set to modify the functions of the commands. Thus, non-standard functions may be implemented without the need to use additional, i.e. non-standard instructions.
18 Citations
20 Claims
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1. A smart card comprising:
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a processor having a command set; and a memory for storing (1) a first file, (2) a first attribute table associated with the first file and with the commands of the command set, and (3) computer code for; determining a position in the first attribute table corresponding to a command of the command set to be modified, and modifying an attribute at the position in the first attribute table corresponding to the command of the command set to be modified without modifying any other attributes in the first attribute table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of modifying a function of a command in a command set of a processor of a smart card without adding commands, wherein the smart card includes a memory for storing a first file and a first attribute table associated with the first file and with the commands of the command set, the method comprising the steps of:
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determining a position in a first attribute table corresponding to a command of the command set to be modified; and modifying an attribute at the position in the first attribute table corresponding to the command of the command set to be modified without modifying any other attributes in the first attribute table. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification