SU966684A1 - Information input device - Google Patents

Description

The device relates to computing and is intended for BBOjata information in a computer; : A device for inputting information is known, comprising a keyboard, an encoder, an OR element, a shift register, a counter, a control unit, a buffer register, a comparison unit, a display unit C1 3 However, it allows the information and commands to be entered into the computer by anyone who does not have the authority to do so.

Closest to the proposed invention is a device comprising a memory block, a display block, a comparison block, a timer, two registers, two OR elements, an encoder, an AND block, a delay element, a keyboard, information output buses, command output buses, an input and device output. This device allows for differentiation of access to computer resources 2.

However, for the identification code set, only the keys for the information part of the message are used.

The purpose of the invention is to prevent unauthorized entry of information.

The goal is achieved by the fact that in a device containing a keyboard, the first output of which is connected to the inputs of the first encoder and the first OR element, the output of which through the first delay element is connected to the first input; the first register, the second input of which is connected to the output of the first encoder, the second output of the keyboard, is connected to the first input of the AND block, the output of which is connected to the first input of the second register, the second input of which is connected to the third input of the first register and

15 input device, the output of the second register is the first output of the device and is connected to the input of the second element OR, the output of which is the second output of the device, the third

20, the keyboard output is connected to the first time relay input, the first output of which is connected to the second input of the AND block, the memory block whose output is connected to the first input of the comparison unit, the output of which is connected to the second input of the time relay, the second output of which is connected to block induction, entered the third register, the third element OR, the second

30 delay element and second encoder.

The first input is connected to the second keyboard output and to the first input of the third OR element, the second input of which is connected to the first keyboard output and to the second input of the second digitizer, the output of which is connected to the first input of the third register, the output of which is connected to the second input of the comparator, .the output of the third element OR through the second delay element is connected to the second input of the third register.

The drawing shows a functional diagram of the device.

The device contains a memory block 1 display unit 2 comparison unit 3, time relay 4, first register 5, second register 6, second element OR 7, first encoder 8, block 9 elements AND, first element delay 10, first element OR 11, the keyboard 12 is the second encoder 13, the third register 1 is the third element OR 15, the second element is the delay 16, the output of the device 17, the command output buses 18, the information output, the tires 19 and the input of the device 20. Devices .o works as follows.

When the power is turned on, the first and second registers 5 and 6 are activated, and a prohibitory signal (logical O) is set at the first output of time relay 4, which keeps block 9 of the AND elements in the closed state. At the second output of the relay 4, a signal is set, including the display unit 2. The operator on the keyboard 12 dials an identification code, using the keys to dial the information and command parts of the message. When the keys of the keyboard 12 are pressed, the information converted by the second encoder 13 to the position code, is output to the third register 14 by signals from the output of the second element 16. When using the information keys to dial the identification code, the information is simultaneously entered into the first register 5, but it is not is used / because there is no Ready signal at the output 17 of the device.

If the entered code coincides with the reference one stored in memory block 1, comparison block 3 outputs a permit signal in relay 4 times. After pressing on the keyboard 12 keys to enter the identification code. The time relay 4 outputs to the block 9 elements AND an enable signal, which ensures the input of commands from the keyboard 12 to the second register 6. At the same time, a signal is set at the second output of the time relay 4, on which the display unit 2 is activated. Relay 4 time begins to form a time interval during which it is possible to enter commands and information in the computer on tires iS and 19.-,

During the set time interval, the operator can type the information and command parts of the message on the keyboard 12. When you press the information keys of the keyboard 12, the information converted by the first encoder 8 into a binary code, using signals from the first delay element 10, is entered into the first register 5. When pressing the Command Keys 12, the command part of the message is entered through block 9 of the elements And into the second register 6. At the output of the second element 7 OR, the Ready signal is generated, according to which E.VM receives the message or the tires 18 and 19.

When the message is typed, the information is entered into the third register 14, but is not used. After receiving the message, the computer reset registers 5 and 6: via bus 20.

After a fixed time interval, the relay 4 time closes the elements of And block 9, so-. I block the input of commands, and turns on the display unit 2. In this case, the operator needs to re-enter the password.

Unlike the protype in this device, not only the information part of the keyboard, but also the command part is used to dial the identification code and. This reduces the likelihood of identifying an identification code.

Claims (2)

Invention Formula A device for entering information containing keyboards y., The first output of which is connected to the inputs of the first encoder and the first element. OR, the output of which through the first delay element is connected to the first input of the first register, the second input of which is connected to the output of the first encoder, the second keyboard output connected with the first input of a block of elements And, output. which is connected to the first input of the second register, the second input of which is connected to the third input of the first register and is the device input, the output of the second register is the first output of the device and is connected to the input of the second OR element, the output of which is the second output of the device, the third keyboard output connected to the first input of the time relay, the first output of which is connected to the second input of the block of elements. And, the memory unit, the output of which is connected to the first input of the comparison unit, the output of which is connected to the second input of the time relay, the second output of which is connected to the display unit, which is so that, in order to prevent unauthorized entry of information, the third register, the third element OR, the second delay element and the second encoder, the first input of which is connected to the first keyboard output and the first input of the third element OR the second input of which is connected to the first, first output 1 (the lavatory and the second input of the encoder, the output of which is connected to the first input of the third register, the output of which is connected to the second input of the comparison unit, the output of the third element OR through the second delay element is connected to the second input of the third register .. Information sources taken into account during the examination, 1. USSR author's certificate No. 648971, class G 06 F 3/02 1978. 2. Copyright testimony of the USSR for application 2938841 / 18-24,; cl. G 06 F 3/02, 1980 (prototype).