CN2682465Y

CN2682465Y - Cryptographic lock device for actual time mark of electronic document

Info

Publication number: CN2682465Y
Application number: CN 200420035124
Authority: CN
Inventors: 曾胡
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-02-19
Filing date: 2004-02-19
Publication date: 2005-03-02
Anticipated expiration: 2014-02-19

Abstract

The utility model discloses a cryptographic lock device for actual time mark of electronic document which comprises an outer shell, a circuit board arranged in the outer shell, and an SCM on the circuit board. The utility model is characterized in that a corresponding attachment plug that extends out of the outer shell and connects with the corresponding interface of a computer is connected to the circuit board. An attachment plug interface module, an external clock producing module, a puzzle lock arrangement memory module and a battery are arranged on the circuit board. The attachment plug, the attachment plug interface module, the SCM, the external clock producing module, and the puzzle lock arrangement memory module are connected with one another through data wires and data transmission can be conducted. The battery provides current supply to the external clock producing module. The utility model is plugged in the corresponding interface of a computer, when electronic document with temporal sign is needed, via the corresponding interface of the computer, the application software reads from the cryptographic lock device for actual time mark of electronic document the time at that moment and put the result into the secret key of the EEPROM where Encryption is conducted and then the time is read-in. Decrypting is conducted by the computer after the read-in process and the time is marked at the electronic document.

Description

A kind of encryption lock device that is used for electronic document mark actual time

Technical field

The utility model relates to a kind of time mark that is used for electronic document, can be on each electronic document one of mark prove the computer-readable encryption lock device of the true deadline of the document.

Background technology

Along with the high speed development of electronics and information industry, robot calculator is applied to file processing and stores very general at present.Part is because its possible technology can be obtained more and more, part is because it has many advantages than traditional storage means: storage space reduces, access speed is accelerated, concentrate retrieval capability, " multiple " and " backup " document copy can be made easily, and document can be shifted and send apace.

But the content that a shortcoming of known electronic document is the e-file of original storage is modified easily, for example purpose in fraud of.Though an original paper document can be modified, but these modifications (wipe or add) will be left a trace usually, and in contrast, electronic document can perfectly be revised, and the initial time that the time mark of finishing after will revising after the modification is modified as this electronic document generation can not stay any vestige.And in some industries, as the generation of various contracts in the generation of the declaration file of the generation of the generation of the various files of company and storage, various legal documents and storage and building enterprise and storage, the commercial contact with store or the like, whether the authenticity of the time mark on the electronic document, is very important.But at present the time mark of electronic document generally is that software is read computer clock, with the time mark of system among the attribute of file.Because the computer system time is the manual amendment easily, makes that the authenticity of these electronic documents can not be convincing.

In order to address this problem, the solution of the previous recommendation of order is to use to be write once the readable repeatedly optical media of (WORM) and comes store electronic documents.The data that an advantage of WORM media store is its storage be intrinsic cannot the change-data only being written to the medium last time, yet this method also has several shortcomings.For example, be recorded in data on the WORM medium and can copy to from the WORM of raw readings dish and can rewrite medium and make amendment, then not with any traceable vestige be recorded on the new WORM.In addition, never be modified since just being recorded on the dish though can very confidently declare the data on any one specific WORM dish, can not judge that whether the date and time of record data or data mated with the same original paper of any kind of with any definite or clear and definite method.

The solution that also has a recommendation is exactly the method by network, when client need generate the electronic document of band time mark, send the request of timestamp mark by client computer to server, send the timestamp that getting the nod of a standard encrypted by server to client the electronic document that client generates is carried out time mark.The typical case of this class technology representative is that " to comprise the digital document management and imaging system and method for secure file mark " with publication number be the disclosed Chinese patent of CN1439982A " the time mark system and the program medium that is used for identical purpose that are used for electronic document " to the disclosed Chinese patent of CN1354935A as publication number.Wherein the technical solution of a kind of digital document management in " the digital document management and imaging system and the method that comprise the secure file mark " patented claim and imaging system employing is with the additional independent data of the image recording of each storage, this image comprises a true date can not being obtained by the secure clock that the user is provided with from one, a numeral that is obtained by CRC (CRC) algorithm to this view data and this true date.Fast as far as possible this additional data is recorded in each digital document after this document obtains.If this document is changed behind the record additional data in some way, the image C RC that the file of more correcting one's mistakes is calculated can not be complementary with original image C RC in this document again.Like this, just can detect true that file has been modified.Equally, if this true date is changed in some way, recomputate this date CRC with this fact of same announcement.And the patented claim of " the time mark system and the program medium that is used for identical purpose that are used for electronic document ", its technical solution that adopts is to prepare mechanism at the electronic document of customer site to comprise first and second documents preparation terminal device.This first terminal device sends to time mark with the document prepared and time mark request message and issues server, and the latter generates privacy key with signature and gives and sign electronically and these data are returned to first terminal device.This second terminal device sends to this time mark authentication server to document files of receiving from first terminal device with time mark and time mark checking request message.The latter verifies time mark with the signature verification privacy key, and returns the checking result.The feasible date and time that may easily provide time mark to prove the document of preparing with general file preparation software of such technical scheme is provided, and simply and accurately verifies this time data.

Also to have a problem be exactly that equipment investment is bigger but the method for above-mentioned employing network comes that the electronic document that client generates is carried out time mark, manages also more complicated, and some application software is not necessarily moved in network.

Summary of the invention

Goal of the invention of the present utility model provides a kind of time mark that is used for the electronic document that unit generates, can be on each electronic document one of mark prove the encryption lock device of the true deadline of the document.

The technology settling mode that the foregoing invention purpose is adopted is: this encryption lock device comprises a shell and setting wiring board and setting single-chip microcomputer in the circuit board in the enclosure, it is characterized in that being connected with in the circuit board one and stretch out the corresponding plug that shell can link to each other with computing machine the corresponding interface, and be furnished with plug interface module, external clock generation module, encryption lock in the circuit board memory module and battery are set; Plug, plug interface module, single-chip microcomputer, external clock generation module, encryption lock are provided with between the memory module and adopt data line to link to each other to carry out data transmission, and battery is powered to outside clock generating module.

Owing to adopted design proposal as above, the utility model to constitute the encryption software lock or the USB flash disk of a band external clock, made clock system be independent of outside the computer system.Because it is from charged pool, but thereby long-play.The utility model external clock just can not interrupt once being provided with.Then the user is irrecoverable as interrupting by force, needs to recover to corresponding administrative authority.

Principle of work of the present utility model is: the utility model is inserted on the computing machine corresponding interface, at first detects the external clock system during operation of start back application software, if record the external clock system break, and application software report information or out of service then.If it is normal to record the external clock system, application software then continues operation.When needing to generate the electronic document of band time mark, application software reads the time at that time by the corresponding interface of computing machine from the utility model, and read in after key among the EEPROM is encrypted with being stored in, read in the back and be decrypted by computing machine, and with time mark in electronic document.

The utility model compared with prior art need not network system, and unit just can be finished the encryption time mark of electronic document.Has advantage easy to operate, small investment.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the circuit theory diagrams of embodiment;

Embodiment

To a kind of encryption lock device that is used for electronic document mark actual time shown in Figure 2, comprise that a shell 1 and single-chip microcomputer 3, USB plug interface module 4, external clock generation module 5, an encryption lock that is arranged on the wiring board 2 in the shell 1 and is provided with in the circuit board are provided with memory module 6 and battery 7 as Fig. 1; Be connected with one in the circuit board and stretch out the USB plug 8 that shell 1 can link to each other with the computing machine USB interface, USB plug 8, USB plug interface module 4, single-chip microcomputer 3, external clock generation module 5, encryption lock are provided with and adopt the continuous data transmission of carrying out of data line between the memory module 6, and battery 7 is to outside clock generating module 5 power supplies.

In the present embodiment, single-chip microcomputer 3 adopts the single-chip microcomputer of AT89C52 model.USB plug interface module 4 adopts the USB interface chip of the PDIUSBD12 model of Philips company.External clock generation module 5 is high-performance, low-power consumption, wide voltage, has RAM real-time timepiece chip DS1302.Encryption lock is provided with the serial CMOS electric erasable program storage EEPROM of memory module 6 for low-power consumption, wide voltage, 64Kb, support I2C agreement, and model is 24LC64.

DS1302 and 24LC64 voltage power supply scope are 2.5～5.5, communicate by letter with MCU with the I2C bus.

When inserting computing machine, the encryption lock device, extracts the back by battery 7 power supplies by the powered battery of USB mouth.

The capacity that encryption lock is provided with memory module 6 increases, and can make USB flash disk and use.

The encryption lock device of present embodiment also can adopt the mode of parallel port to link to each other with computing machine.

Claims

1, a kind of encryption lock device that is used for electronic document mark actual time, comprise that a shell (1) and one are arranged on the wiring board (2) in the shell (1) and are arranged on single-chip microcomputer (3) on the wiring board (2), it is characterized in that on wiring board (2), being connected with one and stretch out the corresponding plug (8) that shell (1) can link to each other with computing machine the corresponding interface, and on wiring board (2), be furnished with plug interface module (4), external clock generation module (5), encryption lock memory module (6) and battery (7) are set; Plug (8), plug interface module (4), single-chip microcomputer (3), external clock generation module (5), encryption lock are provided with between the memory module (6) and adopt data line to link to each other to carry out data transmission, and battery (7) is powered to outside clock generating module (5).