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File searching method of intelligent card file system

A technology of a file system and a search method, applied in the file search field of a smart card file system, can solve the problems of complex file search process, low file security reliability, different implementation details, etc., so as to solve the file search difficulty and improve the security and reliability. , the effect of improving speed and fit

Active Publication Date: 2019-07-12
成都三零嘉微电子有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Although the smart card chip file system of each manufacturer follows the ISO7816 specification, the specific implementation details are different. low efficiency

Method used

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  • File searching method of intelligent card file system
  • File searching method of intelligent card file system
  • File searching method of intelligent card file system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0045] A file search method of a smart card file system provided by this embodiment, the smart card file system includes a master file MF, a dedicated file DF and an elementary file EF;

[0046] The file search methods include:

[0047] The file storage module divides the storage area of ​​the smart card file system, designs the data structure of the smart card file system and stores the data content of the smart card file system;

[0048] The file creation module creates the main file MF, the special file DF and the basic file EF, and when creating a file, allocates the space occupied by the file content, calculates the storage address of the file, builds a file linked list, updates the directory and file header data structure, and calculates The size of the remaining space and the latest storage address;

[0049] The file search processing module performs file search and file selection in the smart card file system.

[0050] The smart card file system in this embodiment is...

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PUM

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Abstract

The invention discloses a file searching method of an intelligent card file system. The intelligent card file system comprises a main file MF, a special file DF and a basic file EF. The file searchingmethod comprises the steps that a file storage module divides a storage area of an intelligent card file system, designs a data structure of the intelligent card file system and stores data content of the intelligent card file system; a file creating module creates a main file MF, a special file DF and a basic file EF, and distributes the space occupied by file content, calculates the storage address of a file, constructs a file linked list, updates a directory and a file header data structure, and calculates the size of a remaining space and a latest storage address when creating the file; and a file search processing module carries out file search and file selection in the intelligent card file system.

Description

technical field [0001] The invention relates to smart card technology, file system creation and indexing technology, in particular to a file search method of the smart card file system. Background technique [0002] A smart card is mainly composed of two parts: an integrated circuit chip and a chip operating system COS. COS is an important part of the smart card. It manages various resources inside the chip, and serves various applications on the upper layer by calling the hardware of the lower layer. It is a bridge between software and hardware. The main function of COS is to manage the allocation of storage resources inside the smart card and the reading and writing of data, analyze and process various commands inside the card, and realize the information exchange between the smart card and the outside world. It mainly includes four functional modules: transmission manager, security manager , application manager and file manager. Among them, the transmission manager is u...

Claims

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Application Information

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IPC IPC(8): G06F16/14
CPCG06F16/14
Inventor 马资道魏贵鹏谢演
Owner 成都三零嘉微电子有限公司
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