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CN100446024C - Protection method and system of electronic document - Google Patents

Protection method and system of electronic document Download PDF

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Publication number
CN100446024C
CN100446024C CNB2007100631028A CN200710063102A CN100446024C CN 100446024 C CN100446024 C CN 100446024C CN B2007100631028 A CNB2007100631028 A CN B2007100631028A CN 200710063102 A CN200710063102 A CN 200710063102A CN 100446024 C CN100446024 C CN 100446024C
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China
Prior art keywords
file
protection
name
module
system filter
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Expired - Fee Related
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CNB2007100631028A
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Chinese (zh)
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CN101008974A (en
Inventor
陆舟
于华章
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Feitian Technologies Co Ltd
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Beijing Feitian Technologies Co Ltd
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Priority to CNB2007100631028A priority Critical patent/CN100446024C/en
Publication of CN101008974A publication Critical patent/CN101008974A/en
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Publication of CN100446024C publication Critical patent/CN100446024C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

This invention discloses one method to code and protect electron files by use of modifying file names and combining file system filter and intelligent key device and its realization protection system, wherein, this invention adopts file system filter drive to process files; user needs not adopt protection actions when visiting and operating files for user easy; its adopts intelligent key device combining with file system filter coding files to make the file of higher safety.

Description

A kind of e-file guard method and system
Technical field
The present invention relates to information security technology, relate in particular to a kind of method and system thereof that carries out the e-file protection that drive by the revised file name and in conjunction with file system filter.
Background technology
Along with the fast development of computer technology and infotech, computing machine has become people's daily life, office and study necessary tool, and more and more data information is preserved on computers by the form of e-file.When this form offered convenience to people, security hidden danger had also appearred---and a lot of document information have confidentiality, can not and distort by desultory reading, therefore need to guarantee the security of sensitive information.At present people mainly utilize and encrypt and cipher verification technique is controlled the visit of illegal operation person to sensitive information, for example utilize various key mechanisms to file encryption, or utilize the password authentification person's that comes the verification operation identity, thereby prevent illegal operation person's access file.
Though above-mentioned document protection method with file encryption can to a certain degree play a protective role to e-file; if but user's cold call file or illegal operation person's access file; because file is stored with the ciphertext form; so file can be attempted automatic recovery, file will damage and can't use like this.And this kind method need be set up the file that listed files is listed encipherment protection, and in a single day listed files is lost just and can not the file of encrypting be decrypted, and causes and can't operate file.And the above-mentioned method of utilizing the password authentification protected file because password is forgotten easily and leaked, also can threaten to the safety of file.So above-mentioned two kinds of methods all can not play effective protective effect to e-file.
Intelligent key apparatus is a kind of small hardware device that has processor and storer, and it can be connected with computing machine by the data communication interface of computing machine.Intelligent key apparatus adopts the legitimacy of password authentification user identity, when carrying out authentication, intelligent key apparatus is linked to each other with computing machine, the user inputs password on computers, the correctness of automatic this password of verification of intelligent key apparatus meeting, have only when the password of user's input is correct, just allow user's operative intelligence key device.Intelligent key apparatus also has the key systematic function, but and safe storage key and preset cryptographic algorithm.The intelligent key apparatus computing relevant with key be fully at the device internal operation, and intelligent key apparatus has the anti-characteristic of attacking of physics, and security is high.If intelligent key technology that can this security is higher is applied to the file protection field, safety of files will improve greatly.
Our structure of the Windows file system used is layering at present, upper level applications access file system all needs to write down and manage by I/O request package (IRP), and each I/O visit all can impel an I/O request package to be sent to the file system driving.In each I/O request package, write down the file handle that obtains when process is opened this document.Usually also can add one deck file system filter on the upper strata that file system drives and drive, it can filter the I/O request package that upper layer application sends, and then sends to the file system Drive Layer.
Summary of the invention
The present invention is directed to the potential safety hazard that e-file under the prior art exists, proposed to utilize the revised file name and drive and intelligent key apparatus carries out the solution of encipherment protection to e-file in conjunction with file system filter.
A kind of e-file guard method comprises the protection to file, and browsing and visiting agent-protected file.
(1) the protection process to file comprises:
Encrypt file;
Revise the original document name of described encrypt file;
Store the described encrypt file of revising filename;
(2) process of browsing agent-protected file comprises:
Upper level applications sends the IRP_MJ_DIRECT_CONTROL request;
By the file system filter driving filename in the request package is reverted to described original document name, and show agent-protected file with described original document name;
(3) process of visit agent-protected file comprises:
Upper level applications sends the IRP_MJ_CREATE request;
File system filter drives makes amendment the mode of the revised file name so that file is implemented protection of the filename in the request package;
Operating system drives sets up file handle;
Upper level applications utilizes described file ten days handle transmission IRP_MJ_READ request to read file, and file system filter drives and is decrypted;
Or upper level applications utilizes described file handle to send IRP_MJ_WRITE request revised file, and file system filter drives and encrypts.
In above-mentioned protection process to file, the operation of encrypt file can be driven by file system filter and finish, and also can be finished by upper level applications.
In above-mentioned protection process to file, the operation of revised file name is to add the signature identification string in the extension name of original document name.
In above-mentioned protection process to file, the operation of revised file name can be driven by file system filter and finish, and also can be finished by upper level applications.
In above-mentioned protection process to file, after finishing the described encrypt file of revising filename of storage, can be with original file delete.
Intelligent key apparatus participates in described file protection, browses or visits the process of agent-protected file.Before carrying out described file protection, browse or visiting agent-protected file, whether system detects intelligent key apparatus and exists, and if there is no then can not carry out file protection, browse or visit the operation of agent-protected file.
The encryption of file or decryption oprerations driven by file system filter call described intelligent key apparatus and finish.
The file protecting system of using above-mentioned e-file guard method comprises: file protection module, document creation module, browsing file module, read file module, written document module and file system filter driver module;
Described file protection module is encrypted and the revised file name file;
Described document creation module receives the document creation request, revises the original document name and creates file handle;
Described browsing file module receives browsing file request, recovery file original document name by name and with the display file of described original document name;
The described file module of reading receives and to read file request, reads file and deciphering by the file system filter driver module according to file handle;
Described written document module receives the written document request, by file system filter driver module encrypt file and according to file handle file is write disk.
Described e-file protection system also comprises the intelligent key apparatus that is called by the file system filter driver module, and file is encrypted or decryption oprerations.
Described e-file protection system also comprises the intelligent key apparatus monitoring module, whether to be connected with intelligent key apparatus in the supervisory system.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the revised file name has guaranteed when user misoperation or unauthorized access file, and system is recovery file automatically not, avoids file destroyed; And the present invention need not set up listed files, has avoided tabulation to lose the trouble that causes;
(2) owing to adopt the file system filter driving that file is handled, the user need not take safeguard measure to file in addition when visit and operation file, convenient for users;
(3) adopt intelligent key apparatus to drive encrypt file, make file have higher security in conjunction with file system filter.
Description of drawings
Fig. 1 is with the process flow diagram of intelligent key apparatus to file encryption;
Fig. 2 is the process flow diagram of user capture agent-protected file;
The structural representation of Fig. 3 e-file protection system.
Embodiment
Now reaching embodiment in conjunction with the accompanying drawings is described in further detail the present invention.
The present invention to the protection mechanism of file is: utilize existing key mechanism to drive in conjunction with file system filter, with shielded file encryption, (embodiment is with the expansion of revised file example by name for the extension name of revised file ciphertext again, the method of revised file name is identical with the method for revised file extension name), drive by file system at last file is write computer disk; When the shielded file of user capture, file system filter drives and automatically filename is reduced to the original document name, and again with file decryption, the user is an accessible file.Below to concrete file protection, browse, open, the read-write process sets forth one by one.
The process that system protects file is:
Step 101, the user selects to want the file protected by upper level applications;
Step 102, upper level applications utilizes cryptographic algorithm to encrypt described file, and the cryptographic algorithm here can adopt existing cryptographic algorithm such as DES, 3DES, AES, can also be driven by file system filter and call the encryption of intelligent key apparatus realization to file;
Step 103, the extension name of the file after upper level applications will be encrypted is made amendment according to certain rule, can also drive the modification of finishing described extension name by file system filter;
Step 104, amended file drive by file system and write the computer disk preservation, simultaneously can be with original file delete.
The process of user's browser document is:
Step 201, the user is the browser document tabulation in explorer, and upper level applications sends the IPR_MJ_DIRECT_CONTROL request to lower floor;
Step 202, file system filter drive the file extent of recovering in IRP request package original document name by name, the file that makes the Windows system show in internal memory original document name by name;
Step 203, the listed files that the user sees in explorer are the listed files that shows with the original document name.
The process that the user opens agent-protected file is:
Step 301, the agent-protected file that user's selection will be opened;
Step 302, upper level applications send the IRP_MJ_CREATE request, at this moment the original document name by name of the file in the request package;
Step 303, file system filter drive to be revised filename in the request package, and this alter mode is identical with alter mode in the step 103;
Step 304 is set up file handle, uses for revised file or when reading file.
The process that the user reads file is:
Step 401, operating system is according to the file handle visit corresponding document that generates in the step 304;
Step 402, upper level applications sends the IRP_MJ_READ request package, reads the ciphertext of file on disk;
Step 403, according in the step 102 to the encryption method of file, adopt corresponding decryption method to drive and call the intelligent key apparatus declassified document by file system filter;
Step 404, system is shown to the user with the file of deciphering.
The process of user's modification file is:
Step 501, file system is according to the file handle visit corresponding document that generates in the step 304;
Step 502, upper level applications sends the IRP_MJ_WRITE request package, adopts corresponding encryption method to call intelligent key apparatus by the file system filter driving amended clear text file is encrypted;
Step 503, the file after system will encrypt is saved on the computer disk.
Ciphering process to file in the said process has adopted file system filter to drive the method for calling intelligent key apparatus, the further like this safety of files that improved.Whether at this moment, needing to add the detection of intelligent key apparatus watchdog routine has intelligent key apparatus to be connected to current system, and mutual and the intelligent key apparatus and the user's of driving of convenience file system filtration and intelligent key apparatus is mutual.When intelligent key apparatus is connected to computing machine, can encrypt or decipher file, when system does not connect intelligent key apparatus, the user can not visit the agent-protected file of encrypting or deciphering with intelligent key apparatus.
With reference to figure 1, as follows to the step of file encryption with intelligent key apparatus:
Step 601 is connected to computing machine with intelligent key apparatus;
Step 602, watchdog routine have monitored intelligent key apparatus and have inserted, and the prompting user imports PIN code;
Step 603, whether the PIN code of intelligent key apparatus checking user input is correct: if correctly carry out step 605, otherwise carry out step 604;
Step 604, the prompting mistake;
Step 605, the user can need select shielded file by upper level applications;
Step 606, upper level applications drives the request of transmission to file system;
Step 607, file system filter drives and calls the key and the algorithm of intelligent key apparatus inside by the driver of intelligent key apparatus;
Step 608, file system filter drive utilizes built-in key of intelligent key apparatus and algorithm for encryption file;
Step 609, file system filter drive the extension name of revised file, the expansion of Word document .doc by name for example, and then regulation is revised as .doc. with the extension name of the Word document that needs protection in the filtration drive * *
Step 610, file system filter drive the cryptograph files that will revise extension name and are sent to the file system driving, driven by file system it is write the computer disk preservation;
Step 611, the file system filter driver is with original file delete.
With reference to figure 2, when satisfying when having intelligent key apparatus to be connected to the condition of computing machine, the step of user capture agent-protected file is as follows:
Step 701 is connected to computing machine with intelligent key apparatus;
Step 702, watchdog routine monitor intelligent key apparatus and insert, and the prompting user imports PIN code;
Step 703, whether the PIN code of intelligent key apparatus checking user input is correct: if correctly carry out step 705, otherwise carry out step 704;
Step 704, the prompting mistake, the user can not utilize intelligent key apparatus that file is decrypted;
Step 705, the user is the browser document tabulation in explorer, the file that selection needs protection, upper level applications sends the IRP_MJ_DIRECT_CONTROL request package;
Step 706, file system filter drive in the recovery request bag file extension and show the initial extension name at internal memory, and the user sees that by explorer the extension name of the file in the listed files is identical with the original document extension name;
Step 707, the user selects the agent-protected file that will visit in explorer, and upper layer application sends the IRP_MJ_CREATE request, the request access file;
Step 708, corresponding file cocurrent is delivered to the file system filter driving on the file system driving reading disk;
Step 709, file system filter drives the extension name of recovery file;
Step 710, operating system is set up file handle, uses for revised file or when reading file;
Step 711, when the user read file operation, upper level applications sent the IRP_READ request package, and the file handle that the file system filter driving is set up according to step 710 passes through the corresponding document on the file system driver reading disk;
Step 712, the file system filter driver calls key in the intelligent key apparatus and algorithm with decrypt file data by the intelligent key apparatus driver, again clear text file is returned upper layer application;
Step 713, when the user carried out operating writing-file, upper level applications sent the IRP_WRITE request package,
Step 714, file system filter drives key and the algorithm that the driver by intelligent key apparatus calls in the intelligent key apparatus file data is encrypted, and file system filter drives the file handle of setting up according to step 710 ciphertext is saved on the computer disk.
Fig. 3 is the structural representation of e-file protection system.With reference to figure 3, comprising:
File protection module 801---be used for file encryption and revised file name to protecting operation first;
Document creation module 802---be used to receive the document creation request that the file system core layer is sent,, and utilize amended filename to create file handle by the filename in the file system filter driver module 806 modification IRP request package;
Browsing file module 803---be used to receive the browsing file request that the file system core layer is sent, recover memory file name in the IRP request package by file system filter driver module 806, and in explorer with the display file of original document name;
Read file module 804---be used to receive the file request of reading that the file system core layer sends, read file and declassified document according to file handle by file system filter driver module 806;
Written document module 805---be used to receive the written document request that the file system core layer is sent, file write disk by file system filter driver module 806 encrypt files and according to file handle;
Monitoring module 808 is used for the plug of monitoring intelligent key device 807, and carries out alternately with file system filter driver module 806, and the prompting user operates accordingly;
And file system filter driver module 806 and intelligent key apparatus 807.
Wherein, the encrypt and decrypt documents operation is called intelligent key apparatus 807 realizations by file system filter driver module 806; The operation of revised file name is realized by file system filter driver module 806.
The above embodiment only is the preferred embodiments of the present invention; the invention is not restricted to the foregoing description; for persons skilled in the art; the any conspicuous change of under the prerequisite that does not deviate from the principle of the invention it being done all belongs to the protection domain of design of the present invention and claims.

Claims (13)

1. e-file guard method is characterized in that:
(1) the protection process to file comprises:
Encrypt file;
Revise the original document name of described encrypt file;
Store the described encrypt file of revising filename;
(2) process of browsing agent-protected file comprises:
Upper level applications sends IRP_MJ_DIRECT_CONTROL and asks file system;
By the file system filter driving filename in the request package is reverted to described original document name, and show agent-protected file with described original document name;
(3) process of visit agent-protected file comprises:
Upper level applications sends IRP_MJ_CREATE and asks file system;
File system filter drives makes amendment the mode of the revised file name so that file is implemented protection of the filename in the request package;
Operating system is set up file handle;
Upper level applications utilizes described file handle transmission IRP_MJ_READ to ask file system requests to read file, and file system filter drives and is decrypted;
Or upper level applications utilizes described file handle to send IRP_MJ_WRITE to ask the file system requests revised file, and file system filter drives and encrypts.
2. e-file guard method according to claim 1 is characterized in that: in the protection process to file, the operation of encrypt file is driven by file system filter and finishes.
3. e-file guard method according to claim 1 is characterized in that: in the protection process to file, the operation of encrypt file is finished by upper level applications.
4. e-file guard method according to claim 1 is characterized in that: in the protection process to file, the operation of revised file name is to add the signature identification string in the extension name of original document name.
5. e-file guard method according to claim 1 is characterized in that: in the protection process to file, the operation of revised file name is finished by upper level applications.
6. e-file guard method according to claim 1 is characterized in that: in the protection process to file, the operation of revised file name is driven by file system filter and finishes.
7. e-file guard method according to claim 1 is characterized in that: in the protection process to file, finish behind the described encrypt file of revising filename of storage original file delete.
8. e-file guard method according to claim 1 is characterized in that: intelligent key apparatus participates in described file protection, browses or visits the process of agent-protected file.
9. e-file guard method according to claim 8; it is characterized in that: before carrying out described file protection, browse or visiting agent-protected file; whether system detects intelligent key apparatus and exists, and if there is no then can not carry out file protection, browse or visit the operation of agent-protected file.
10. e-file guard method according to claim 8 is characterized in that: the encryption of file or decryption oprerations are driven by file system filter call described intelligent key apparatus and finish.
11. realize the system of one of claim 1 to 10 described e-file guard method, it is characterized in that comprising: file protection module, document creation module, browsing file module, read file module, written document module and file system filter driver module;
Described file protection module is encrypted and the revised file name file;
Described document creation module receives the document creation request, revises the original document name and creates file handle;
Described browsing file module receives browsing file request, recovery file original document name by name and with the display file of described original document name;
The described file module of reading receives and to read file request, reads file and deciphering by the file system filter driver module according to file handle;
Described written document module receives the written document request, by file system filter driver module encrypt file and according to file handle file is write disk.
12. e-file protection system according to claim 11 is characterized in that: described file system filter driver module comes file is encrypted or decryption oprerations by calling intelligent key apparatus.
13., it is characterized in that: comprise the intelligent key apparatus monitoring module, whether to be connected with intelligent key apparatus in the supervisory system according to right 11 described protection systems to e-file.
CNB2007100631028A 2007-01-26 2007-01-26 Protection method and system of electronic document Expired - Fee Related CN100446024C (en)

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Granted publication date: 20081224