KR940007812B1 - Keyboard locking method for personal computer - Google Patents

Abstract

The keyboard locking method comprises the steps of: taking a BIOS (basic input output system) interrupt and pressing a current hot key; recording key data determined by the user in a CMOS register; reading the recorded data, and if a corresponding key is the hot key, producing a beep sound and transmitting a password byte; sequentially storing character data in the CMOS register; and informing a processor that a security character has been transmitted and providing a security enabling command, thereby reducing manufacturing cost.

Description

How to lock your keyboard

1 is a conventional circuit block diagram.

2 is a menu screen for setting a password and a hotkey of the present invention.

3 is a flowchart of a control operation of the present invention.

* Explanation of symbols for main parts of the drawings

10: lock 11: tri-state buffer

12: resistance 15: keyboard controller

The present invention relates to a keyboard locking method of a personal computer (PC), and more particularly to a keyboard locking method using a CMOS register and a keyboard security buffer.

In general, a PC is composed of a system main body, a keyboard, and a display CRT, and the system is connected to various peripheral devices such as a printer. In the system main body, a main system board is embedded, a floppy disk drive (FDD) and a hard disk drive (HDD) are embedded, and a power supply device (SMPS) is embedded. The main system board includes a central processing unit, various memory device peripheral connection ports, and communication ports. The keyboard is usually composed of data input keys such as 86 keys or 101 keys and various control keys. The CRT monitor is configured to operate in a text mode displaying character information and a graphic mode displaying graphic video information.

The operating system (OS) that can be used in the above PC system includes MS-DOS, CP / M-86, UNIX, and the like, and various languages, including BASIC language, are available.

In order to implement a keyboard lock device in the PC system as described above, a key body and a lock are implemented in the PC body. That is, as illustrated in FIG. 1, when the keyboard is locked with the keyboard lock 10, the controller is connected to the keyboard controller 15 through the tri-state buffer 11. The keyboard controller 15 is connected to a 5 V power supply terminal 5 via a resistor 12. The 5V power supply terminal 5 is connected to pin 24 of the keyboard controller 15.

In such a conventional configuration, in the state where the keyboard is not locked with the lock and the key, the terminals 1 and 2 of the lock 10 are opened so that the resistor 12 is applied to the pin P24 of the keyboard controller 15. 5V power supply terminal 5 through the power is supplied to the keyboard to operate normally. However, when the keyboard is locked by the lock and the key, the terminals 1 and 2 of the lock 10 are shorted, so that the 5V power supply of the power supply terminal 5 becomes the resistor 12 and the tri-state buffer 11. Since it flows to the ground of the lock 10 through the (), the operating power is cut off to the pin (P24) of the keyboard controller 15, the keyboard does not operate.

As described above, since the keyboard lock is composed of a hardware lock and a key, there is a problem of contact failure due to long-term use, and a problem of unavailability due to the loss of a user's key. In particular, a separate key and lock are mounted on a PC. Since there is a problem that the unit price increases.

Therefore, the present invention was devised to solve the above-mentioned conventional problems, and an object of the present invention is to reduce the cost required for the keyboard lock of a personal computer, and to solve the corresponding keyboard lock function in software. In providing a method.

Technical means for achieving the above object of the present invention is a first step of inputting the current hot key through the BIOS interruption when the operation is started with a password and a hot key for the keyboard lock of the personal computer is set in advance, and A second step of writing the key information determined by the user at the time of setting when the hot key is pressed into the CMOS register; and a third step of reading the record again, beeping when the corresponding key is the hot key, and instructing the processor to transmit a password byte. And a fourth step of sequentially storing the character data in the CMOS register in a loop according to the number of characters set by the user, and after storing all of the problem data, notifying the processor that the CAPTCHA transmission is completed and providing security enable. The fifth step of the command is executed sequentially so that the keyboard can be locked by the control program. The features. In addition, the method of locking the keyboard using the password and the hot key may be enabled even in a DOS prompt state or an application program state of the system, and the password setting character may be up to 8 characters, and the corresponding characters may include alphabet uppercase / lowercase letters and numeric characters. Inclusion is preferred. In addition, the password is set by using the bytes of the CMOS as a password assigned by using the security byte of the keyboard BIOS, the password is included in the BIOS routine of the system, the system only after a password that matches the set password is entered It is effective to allow this to boot. In addition, when the hot key is pressed, a beep sound may be informed that the system is in a secure state.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, there are two main ways to lock a keyboard. First, if you power on the system while the keyboard is locked, the system will not boot and the BIOS (Basic Input Output System) will display a message that the keyboard is locked and the keyboard will not work. Thus, without the owner of the PC, any user will not be able to boot the system. Secondly, if you lock the keyboard while the system user is away from the system, the current task will be interrupted. At this time, others will not be able to use the system. However, in the recent personal computer systems, the PC / Mouse that does not support the keyboard BIOS, although the keyboard lock consisting of a lock and a key is effective, the majority of those that support the PS / 2 mouse as the keyboard BIOS do. In a personal computer, even though the keyboard is locked with a lock and a key, the keyboard does not work when the PS / 2 mouse is attached, but the PS / 2 mouse works normally. This case therefore violates the purpose of the keyboard lock described above. Therefore, in the present invention, the keyboard lock device of about $ 1.5 is removed and the pin P24 of the keyboard controller is accessed by a 5V power source to disable the inhibit. Then, in order to serve the two purposes of the keyboard lock described above, a password (a password) is inserted into the BIOS routine to prevent the system from booting until the user correctly enters the password. In addition, for the second purpose, in a system equipped with a keyboard controller supporting a PS / 2 mouse, a means of locking the keyboard and the PS / 2 mouse as a hot key using a security feature of the keyboard BIOS is introduced. do. To this end, the present invention allows the user to define " hotkeys " for garnet passwords and key look in FIG. 2 and in BIOS SETUP.

In the present invention, since the security byte of the keyboard BIOS is 64 bytes, the bytes of the complementary metal oxide semiconductor (CMOS) are allocated by the bytes allocated as the password. 2 is a menu screen for setting a CMOS password and a hot key of a key look. The password is set in advance and waits for the same password as the set password. At this time, the password can be specified up to a character character, and the usable characters are English alphabet uppercase letters A-Z, lowercase letters a-z, and numeric characters 0-9. Also, the hotkey can be set by the user and in FIG. 2 the hotkey indicates that the user has selected 5 when CTRL / ALT / 5. To exit the password or hot key setting mode, use the "ESC" function key, use the "PGUP / DOWN" function key to change the character, and select the corresponding character using the arrow function key.

3 is a flowchart illustrating a control operation of the present invention, in which a control program is executed when a hotkey for key lock is input. In FIG. 3, when the key lock is pressed by a hot key, an operation flow diagram of giving CMOS information to the security byte in the keyboard BIOS at Interrupt 9H (where H is an abbreviation of Hexadecimal) in the BIOS is shown. The user can boot the system only when the system needs to know the password with the password set, and the user presses the character key combination of the user defined password in the prompt state or the application program execution state. The password byte in CMOS is then loaded into the security byte in the keyboard BIOS, so the key does not work properly until the correct password is entered. And even with a PS / 2 mouse, the system won't work until the correct password is entered. In addition, the conventional keyboard lock program is effective only in the DOS (Disk Operating System) prompt state, but in the present invention, even in the application program state other than the DOS prompt state, there is no problem in the application program at all, and does not occupy a separate memory and lock function is Yes, especially when the hotkey is pressed by beep to let you know that the system is in a secure state. That is, when operation 101 starts in FIG. 3, an interrupt 102 is placed in the BISO. The user enters 102 a hotkey in the interrupted state. The hotkey is pressed at the DOS prompt or in the application program state. The hot key uses a CNTL key and an ALT key. When the hot key is input, it is checked (104). If it is not a hot key input, it is returned 105. If the hot key is input, the key information determined by the user in Setup is recorded in the CMOS register, and the corresponding key is read as CNTL. A beep sounds when the and ALT keys are pressed together. It then sends an instruction 107 to the processor (e.g. 8042) to give information from now on. The CMOS byte in which the password is recorded is read and sent to the security buffer of the processor (108). At this time, the first character written and set by the user in the CMOS register is written to the processor's 60H port (109).

After repeating the loop 110 as many times as the number of characters recorded by the user and writing zero (111) to the port 60H of the processor 8082, 111 is notified that the CAPTCHA is over, and then secured to the processor. Command 112 to enable. In this state, there is no response at all by pressing a key on the keyboard or by moving or pressing a PS / 2 mouse until the information recorded in the security buffer loaded in the processor is received.

As described above, the present invention can reduce the cost by removing the keyboard lock using a hardware lock and key, and the effect of solving the style of the IBM PC compatibility that PS / 2 mouse does not work even if the key lock device is operated. There is. In addition, there is an advantage to meet the technical current flow from the physical keyboard lock to the program lock.

Claims (6)

When the operation is started with the password and the hotkey for the keyboard lock of the personal computer set in advance (101), the first step is to enter (103) the BIOS hotkey (103), and if the hotkey is pressed (104). The second step of recording 106 the user-defined key information in the CMOS register at the time of setting, and re-read the record to make a beep when the key is a hot key, and then instructs the processor (8042) to send a password byte ( 108) a fourth step of sequentially storing the character data in the CMOS register by turning the loop 110 according to the number of characters set by the user, and storing all of the character data to the CAPTCHA. A personal characterized in that the keyboard lock is executed by the control program by sequentially executing the fifth step of informing that the transmission is completed and instructing the security enable. How to lock the keyboard of the computer. The method of claim 1, wherein the method of locking the keyboard using the password and the hot key is enabled in a DOS prompt state or an application program state of the system. The method of claim 1, wherein the password setting character may be up to eight characters in length, and the corresponding characters include alphabet uppercase / lowercase letters and numeric characters. 2. The keyboard locking method of claim 1, wherein the password is set by using a byte of the CMOS as a byte allocated as a password using a security byte of the keyboard BIOS. The method of claim 1, wherein the password is included in a BIOS routine of the system and the system is booted only after a password corresponding to the set password is input. The method of claim 1, wherein a beep sound is heard when the hot key is pressed to indicate that the system is in a secure state.