CN201047933Y

CN201047933Y - Random cipher digital display keyboard

Info

Publication number: CN201047933Y
Application number: CNU2006200365266U
Authority: CN
Inventors: 于素清
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-05
Filing date: 2006-12-05
Publication date: 2008-04-16
Anticipated expiration: 2016-12-05

Abstract

The utility model discloses a digital display random-code keyboard, which comprises a keyboard body and a key-value display driving circuit which is used for controlling and processing function keys and conducting dynamic definition and identification of each numeral key. The circuit has a central processor with a dynamic data register which comprises a real-time scanning keyboard for randomly generating numerals to be cleared after being confirmed. The central processor is also communicated with a data latch and a display decoder which is connected with the display unit; the connected display unit has a transparent pushbutton, the visible angle of which is less than 15 DEG; a convex lens is arranged below the transparent pushbutton and is used for projecting key-value numerals of display devices below the convex lens; each numeral pushbutton is provided with a display unit which can display numerals with dynamic changes; each unit is respectively connected to the key-value display driving circuit. The numeral values of different key positions are displayed with random difference, thereby effectively preventing code theft via deduction.

Description

Random cipher digital display keyboard

Technical field

The utility model relates to a kind ofly imports the key board unit that computing machine carries out recognition and verification with password, the changed randomly dynamic displaying cipher keboard of particularly a kind of key assignments.

Background technology

Along with informationization and development of high-tech, keyboard has become one of most important computer external input equipment, it not only can finish normal literal input, and as a kind of cipher input, be widely used in fields of society, as: financial fields such as bank, stock market.The stolen incident of password because the input operation of key position is dynamically easily observed by other people and analysis is decoded, and takes place in the fixing plain code keyboard of key position ordering often in the prior art.Even the precautionary measures of one-meter line, the looking steathily of the photography instrument that also is difficult to avoid ubiquitous.Therefore the defective of plain code keyboard confidentiality difference has been brought unsafe stress to the user.In order to solve the problem that the plain code keyboard easily divulges a secret and to prevent that the ax-grinder from peeping other people password and implementing financial crime, guarantee normal financial transaction, Chinese patent 200510042270.X number, disclose a kind of name and be called " LCD dynamically sorted code keypad ".The demonstration input module of this keyboard is made up of key assignments input media, corrigendum key, clear key that liquid crystal key display reaches correspondingly.Wherein liquid crystal key display connects with control and treatment circuit by flexible cable; Control and processing circuit controls liquid crystal key display show 0-9 10 numeric keys sign indicating number and corrigendum, clear key at random, and the key assignments input media will be selected the pairing key assignments of key and send into control and treatment circuit, transfer to host computer after treatment.Though this patent has solved the problem that the Current Password keyboard is easily divulged a secret, and has certain confidentiality.But the liquid crystal key display of this key assignments input media is owing to be provided with its top, and the observation visual angle face is big, still has by other people and observes the possibility of peeping.And control corresponding and treatment circuit structure are complicated, the cost height.

Summary of the invention

It is little that the purpose of this utility model provides a kind of observation visual angle, confidentiality height, the simple random cipher digital display of circuit structure keyboard.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of random cipher digital display keyboard, the display unit that comprises a keyboard body that can link to each other and demonstration key assignments with computer external interface, and be built in the keyboard body, the key assignments display driver circuit that is used for the control and treatment function button and each digital keys is carried out Dynamic Definition and identification, it is characterized in that: the key assignments display driver circuit that is electrically connected digital keys, have one and contain the real time scan keyboard, generate digital at random, be identified the central processing unit of the dynamic data buffer of back automatic clear, described central processing unit also is electrically connected with data latches and the display decoder that is connected described display unit, the display unit that is connected also has the transparent button of an angle of visibility less than 15 degree, and it is equipped with the convex lens of a projection bottom display device key assignments numeral down.

The beneficial effects of the utility model are.

Circuit structure is simple, only has one to contain the central processing unit single-chip microcomputer of dynamic data buffer and data latches, the display decoder of electrical connection.Can be as required, the digital key assignments of random variation keyboard and putting in order, dynamic display password natural number key assignments, there are 3628800 kinds of permutation and combination keys of few repetition the key position of random variation, have extremely strong confidentiality, can avoid cracking out the password of input by actuation of keys and position judgment.Angle of visibility can prevent that less than the transparent buttons of 15 degree other people low coverage from spying on the bad behavior that input password or long distance are taken the photograph password steathily.Utilize light-emitting nixie tube to make each key position can show a numeral.But after resetting, each shown numeral is all inequality at every turn, has so just effectively prevented to infer that by the button position situation of coming stealing passwords takes place.

Description of drawings

Further specify the utility model below in conjunction with drawings and Examples, but therefore the utility model is not limited among the described scope of embodiments.

Fig. 1 is a circuit structure block diagram of the present utility model.

Fig. 2 is a key assignments display driver electrical schematic diagram of the present utility model.

Fig. 3 is the organigram of one of them display unit of the utility model.

Embodiment

In Fig. 1, the keyboard body that links to each other with computer external interface is furnished with digital keys and the function button arranged by prior art mode matrix-style on it.The button display unit that shows key assignments is connected to the key assignments display driver circuit that is contained in the keyboard body box body respectively, and in addition, this driving circuit also is connected with the prompting hummer that puts in place with the essentially identical voice warning circuit of prior art and each button operation.Be built in the key assignments display driver circuit that is used for the control and treatment function button and each digital keys is carried out Dynamic Definition and identification of keyboard body, contain the real time scan keyboard, generate digitally at random, be identified the singlechip chip that the central processing unit of the dynamic data buffer of back automatic clear can preferred 8051 models.This central processing unit single-chip microcomputer is electrically connected the matrix form key circuit, connects digital keys and function button by the matrix form key circuit, is electrically connected display unit by data latches and display decoder simultaneously.Numeral on the keyboard by control computer according to central processing unit singlechip chip cryptographic algorithm dynamic assignment.Software part is delivered to each button again according to the password program ordering of 10 password figures of generation 0～9 automatically.Can carry out the password input according to the numeral on the current button during use.After finishing,, after computing machine obtains END instruction, automatically the whole numerals on the button are shown as 0 by finishing strong end operation.

In Fig. 2 schematic diagram, the control procedure of program element passes through to press the function button or the initiating key of lower keyboard, the program element auto-initiation, and the latch zero clearing resets.Keyboard is carried out real time scan declare, the scission of link value, and show and give number to each display unit successively by initial key assignments, the display unit of the display digit after the dynamic change on button shown.When key is pressed, will send the current key assignments that is pressed.Output password by determining the affirmation of bond bundle, send several times 8051 chip central processing units by password storage unit clear 0.All zero clearings of shown numeral on the keyboard.The operation beginning shows new numeral again to wait for next time, and the seat that numeral shows changes.If there is not key to be pressed, the central processing unit single-chip microcomputer is proceeded scanning, wait for certain hour after, shown digital automatic clear on the keyboard.Can be when maloperation is arranged by the strong cancellation operation of cancellation.

Fig. 3 has described the display unit that is respectively equipped with on each digital keys and function button on the keyboard body 2.The display unit of described demonstration key assignments by one by transparent strong cap 1 and can with involutory strong seat 5 angle of visibilities of forming of transparent strong cap 1 less than 15 transparent buttons of spending.There is a groove 6 of laying convex lens 3 at the inner chamber middle part of transparent button, and it has a display device that is electrically connected display decoder and shows each apparent unit key assignments numeral down.The charactron 4 that display device can be also can be a LCD plate.The key assignments numeral that charactron 4 shows projects on the transparent strong cap 1 by the amplifying convex lens of laying thereon 3.Transparent button can be preferably circle, and diameter is less than or equal to 8mm.Calculate by eye distance button 500mm, its visual range is generally the circle of a diameter 130mm.People about the wide about 100mm of face is under situation about facing, and other contiguous people can see that the shown key assignments of button is the comparison difficulty.

Claims

1. random cipher digital display keyboard, the display unit that comprises a keyboard body that can link to each other and demonstration key assignments with computer external interface, and be built in the keyboard body, the key assignments display driver circuit that is used for the control and treatment function button and each digital keys is carried out Dynamic Definition and identification, it is characterized in that: the key assignments display driver circuit that is electrically connected digital keys, have one and contain the real time scan keyboard, generate digital at random, be identified the central processing unit of the dynamic data buffer of back automatic clear, described central processing unit also is electrically connected with data latches and the display decoder that is connected described display unit, the display unit that is connected has the transparent button of an angle of visibility less than 15 degree, and it is equipped with the convex lens of a projection bottom display device key assignments numeral down.

2. random cipher digital display keyboard according to claim 1 is characterized in that described central processing unit is a singlechip chip.

3. random cipher digital display keyboard according to claim 2 is characterized in that described single-chip microcomputer is the singlechip chip of 8051 models.

4. random cipher digital display keyboard according to claim 1, it is characterized in that, display unit by one by transparent strong cap and the angle of visibility that can form with the involutory strong seat of strong cap less than 15 transparent buttons of spending, there is a groove of laying convex lens at the inner chamber middle part of transparent button, and it has a display device that shows the key assignments numeral down.

5. random cipher digital display keyboard according to claim 1 is characterized in that the display device of described demonstration key assignments is a charactron.

6. random cipher digital display keyboard according to claim 1 is characterized in that the convex lens that are respectively equipped with on each digital keys on the described keyboard body are spy magnifieres.