Pseudo-random number sequence file for an integrated circuit card

• US 7,097,107 B1
• Filed: 05/29/2003
• Issued: 08/29/2006
• Est. Priority Date: 04/09/2003
• Status: Active Grant

• Current Assignee: Callahan Cellular LLC (Intellectual Ventures LLC)
• Original Assignee: Mobile MINI Incorporated (WillScot Mobile Mini Holdings Corp.)
• Inventors: Guthery, Scott B.
• Primary Examiner(s): Le, Thien M.
• Assistant Examiner(s): Koyama, Kumiko C.
• Application Number:
  US10/448,450
• Time in Patent Office: 1,188 Days
• Field of Search: 235/487, 235/492, 380/262, 380/30, 380/46, 380/268, 705/65, 708250-256, 713/172
• US Class Current: 235/492
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G06Q 20/40975 using encryption therefor
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system

Abstract

An integrated circuit card includes a microprocessor, an integral memory element, and a pseudo-random number sequence file stored therein. The pseudo-random number sequence file includes a pseudo-random number sequence generator operable to generate an instance of a sequence of apparently random numbers when executed, values for the parameters of the pseudo-random number sequence generator, and an Initial Value for the sequence of random numbers. The microprocessor is operable to execute an operation on the pseudo-random number sequence file in response to a predetermined input from an external source.

Claims

1. An integrated circuit card, comprising:

a microprocessor;

a memory system integral with said microprocessor; and

one or more pseudo-random number sequence files stored in said integral memory system, said one or more pseudo-random number sequence files including

a pseudo-random number sequence algorithm code operative to generate a current instance of a pseudo-random number sequence when executed;

a parametric data set for said pseudo-random number algorithm code wherein said parametric data set includes values for parameters of said pseudo-random number algorithm code; and

a current state data set for said pseudo-random number algorithm code, for storing information associated with said one or more pseudo-random number algorithm codes, said current state data set including at least an Initial Value defining an initial state value for the pseudo-random number sequence;

wherein said microprocessor is operative to execute an operation on one of said pseudo-random number sequence files in response to a predetermined input; and

wherein said information stored in said current state data set comprises a Current Index having a value that identifies each current instance of the pseudo-random number sequence generated by said pseudo-random number algorithm code and a Current Value having a value equal to the current instance of the pseudo-random number sequence generated by said pseudo-random number algorithm code.

2. An integrated circuit card, comprising:

a microprocessor,

a memory system integral with said microprocessor, and

one or more pseudo-random number sequence files stored in said integral memory system, said one or more pseudo-random number sequence files including

a pseudo-random number sequence algorithm code operative to generate a current instance of a pseudo-random number sequence when executed;

a parametric data set for said pseudo-random number algorithm code wherein said parametric data set includes values for parameters of said pseudo-random number algorithm code; and

a current state data set for said pseudo-random number algorithm code, for storing information associated with said one or more pseudo-random number algorithm codes, said current state data set including at least an Initial Value defining an initial state value for the pseudo-random number sequence;

wherein said microprocessor is operative to execute an operation on one of said pseudo-random number sequence files in response to a predetermined input;

wherein said information stored in said current state data set comprises a Current Index having a value that identifies each current instance of the pseudo-random number sequence generated by said pseudo-random number algorithm code and a Current Value having a value equal to the current instance of the pseudo-random number sequence generated by said pseudo-random number algorithm code;

wherein the predetermined input is a READ CURRENT command from an external source addressed to one of said one or more pseudo-random number sequence files; and

wherein said microprocessor is operative in response to said READ CURRENT command to retrieve said Current Value from said current state data set of said addressed pseudo-random number sequence file and return said Current Value to the external source.