SU960784A1 - Data input device - Google Patents

Description

The device relates to computing and is intended to enter information into a computer.

A device for protecting memory fl} is known.

 A disadvantage of this device is its inapplicability in information input devices.

Closest to the invention is a device containing a keypad, an encoder, an OR element, a shift register, a counter, a control unit, a buffer register, a comparison unit, a display unit, and a corresponding link 2}.

This device allows you to detect an error in the input operation until the end of the input of the entire array of information, which leads to a reduction in the input time. However, this device allows one to enter information and command into a computer by a person who does not have the authority to do so (there is no access distinction). In this case, it is possible to write, read, change or erase information stored in the memory of a computer. This may lead to a violation of the functioning of the information system, based on a computer.

The aim of the invention is to improve the reliability of the input of information by unauthorized use of an input device by confirming the credentials of the operator performing the input of information.

The goal is achieved by the fact that in the device containing the display unit, the keyboard, the first output

10 of which is connected to the input of the encoder and to the input of the first OR element, the output of which through, the delay element is connected to the first input of the first register, the second input of which is the device 15 input and connected to the first input of the second register, the encoder outputs are connected to other inputs a first register whose outputs are information output buses and connected to the first inputs of the comparison unit, a timer, a second OR element, a block of AND elements and a memory block, whose outputs are connected to the second inputs, are entered.

25 of the comparison unit, the output of which is connected to the first input of the timer, the first output of which is connected to the input of the display unit, the second output of the keyboard to the second input of the timer, the second

30 whose output is connected to the first input of an AND block, the second inputs of which are connected to the third keyboard output, the outputs of the AND block are connected to the second inputs of the second register, whose outputs are command output sockets and connected to the inputs of the second OR element the output of the device.

The drawing shows a functional diagram of the device for entering information.

. The device contains block 1. memory, block 2 of indication, block 3 of comparison, timer 4, first, register 5, second register b, second element OR 7, encoder 8, block of elements AND 9, delay element 10, first element OR 11, keyboard 12 input information, key 13 input password, keyboard 14 input krmand, information output bus 15 ,; bus 16 reset registers, bus 17 signal ready and command output bus 18.

The device works as follows.

When the power is turned on, the first and second registers 5 and b are reset, and the first output of timer 4 is set to a inhibit signal (logical O), which keeps the gates of the And 9 block of elements in the closed state. At the SECOND output of timer 4, a signal is set that turns on the display unit 2. The operator on the keyboard 12 input information dials the code ideitatsii. When pressing the keys of the information keyboard 12, converted by the encoder 8 into a binary-decimal code, according to the signal of the delay element 10, is transferred to the first register 5. If the identification code coincides with the reference code (stored in memory block 1), comparison unit 3 outputs timer 4 enable signal. After pressing the input key 13, the timer 4 issues an enable signal on the vertical of the element block AND 9, which provides input of commands from the keyboard 14 to the second register 6. At the same time, the second output of timer 4 sets the signal on which the display unit 2 goes off. Timer 4 begins to form a time interval during which commands and information can be entered into the computer via buses 15 and 18.

After that, the operator can dial the information and command parts of the messages 1 on the keyboards 12 and 14. And after dialing the command on the bus

17, the Ready signal is generated, according to which the computer receives a message on buses 15 and 18.

After receiving the message, the computer reset registers 5 and 6 via bus 16. After a fixed interval of time, timer 4 closes the gates of the AND 9 block (thereby blocking the input of commands) and turns on the display unit. In this case, the operator needs to re-enter the password.

 Thus, the unauthorized use of the device is prevented.

Claims (2)

1. USSR Author's Certificate No. 699060, C 11 C 29/00, 1977. 2. The author's certificate of the USSR 648971, kl.S 06 I- 3/02, 1977 (prototype).