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Method for achieving file access security authority management through smart card and file access method

A file access and permission management technology, applied in the field of communication, to achieve the effect of easy implementation and understanding

Active Publication Date: 2014-09-17
DATANG MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a smart card file access security authority management implementation method, system, file access method, and device to solve the problem of authenticating multiple keys with complex 'and', 'or' arbitrary combination relationships. Problems getting file access permissions and being able to use a higher number of keys

Method used

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  • Method for achieving file access security authority management through smart card and file access method
  • Method for achieving file access security authority management through smart card and file access method
  • Method for achieving file access security authority management through smart card and file access method

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Experimental program
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Embodiment

[0051] Such as figure 1 As shown, this embodiment provides a method for implementing security rights management of smart card file access, including the following steps:

[0052] S101: Create an authority control file EF under each dedicated file DF ARR file, each record in the authority control file corresponds to a basic file EF file under the DF file respectively; each record is used to record the access authority of the corresponding EF file;

[0053] The access authority of the EF file refers to the logical relationship of the key, and the key is a key related to the EF file, which is represented by a hexadecimal sequence in this implementation. Access control file EF ARR The record number of the file starts from 1, written sequentially, and the permission control file EF ARR The SFI of the file is fixed at 0xFF for easy finding. The access authority of the EF file includes: read authority and modify authority, and the read authority and modify authority correspond to...

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Abstract

The invention discloses a method and system for achieving file access security authority management through a smart card and a file access method and device. The method includes the steps that an authority control file is built in a DF, and all records in the authority control file respectively correspond to EFs in the DF; each record is used for recording the access authority of the corresponding EF, and the access authority of each EF refers to the logical relation of a secret key; the recording number of each record is written into the file header of the corresponding EF. The records in the authority control file are used for saving the access authority of the EFs, and therefore the access authority can be determined according to one record, the problem that the file access authority can be obtained only when a plurality of secret keys with any complex 'and' 'or' combination relation need to be authorized is solved, and more secret keys can be used.

Description

technical field [0001] The invention relates to the field of communications, in particular to a method and system for realizing security authority management of smart card file access, and a file access method and device. Background technique [0002] The file types of smart cards are divided into special file DF (Dedicated File) and basic file EF (Elementary File). Among them, DF acts like a directory or folder in a computer system, while EF is used to store data. According to the tree structure, there must be one and only one root directory in a card: MF (Master File), also known as the master control file. All other DFs and EFs are under MF. Each DF and EF has its own file ID (FID for short), and the FID is represented by two bytes, in which 3F00 is a dedicated ID for MF, and FFFF is reserved data that cannot be used as a file ID. For EF, in addition to FID, there is also a Short File Identifier (SFI for short), and the EF file can be found through the SFI of the EF fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/62
CPCG06F21/604G06F21/6218G06F2221/2141
Inventor 熊燕萍周清蔡晓卫徐文军
Owner DATANG MICROELECTRONICS TECH CO LTD
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