JP4167604B2 - Keyboard with mapping conversion function - Google Patents

Description

  The present invention relates to a keyboard, and more particularly to a keyboard having a mapping conversion function to enhance security.

  In recent years, information processing devices have come to be used in a wide range of fields, and communication networks such as the Internet have been rapidly established, so that information stored in information processing devices is often read from the outside. Therefore, although it is effective in terms of information sharing, there are many information that requires confidentiality, and password entry for login is widely adopted. There is a security problem that a password is not set due to access and troublesome operations.

Various methods for enhancing security have been devised. For example, it is not so difficult to obtain a password illegally when security is applied, so security is applied to a third party. It is disclosed that a power supply can be turned on without entering a password so that the user does not understand the password, and in that case, dummy information is output to protect security against unauthorized acquisition of the password ( Patent Document 1). In addition, if there is no password setting, the security against information leakage is improved by restricting the activation and password protection release of the secondary storage device, while if there is no input device that can input the password if there is a password setting, another input device Discloses an information processing apparatus that improves the convenience of the operator by enabling password authentication (see Patent Document 2). Also, the personal information is read from the card with a card reader, the validity of the personal code is judged for each function by the verification circuit, and when valid, the password generation circuit generates a password effective for the corresponding function, and the password By switching the keyboard input to the central processing means to the input of the password generation circuit at the time of input standby, it is not necessary to input the password by operating the keyboard, and there are user restrictions for each function. A security computer that can be used is disclosed (see Patent Document 3).
JP 2002-24093 A JP 2002-268767 A JP-A-5-11875

  In the invention described in Patent Document 1, if a third party reads a key operation of data input by an operation of the input unit with the power switch turned off, the third party reads the data stored in the storage medium. And rewritable. Also in the invention described in Patent Document 2, if a third party reads the key operation at the time of password input, the third party can read and rewrite data stored in the storage medium. In the invention described in Patent Document 3, if a card in which a personal code is recorded is copied, a third party can read data stored in a storage medium.

  There are various ways for a third party to obtain a password, but when an operator operates a key on the keyboard to input an ID or password, the password is read by reading the input contents or looking at the movement of the hand. Many are seen.

  An object of the present invention is to provide a security-enhanced keyboard that prevents a correct password from being read even if an operator sees a hand movement when operating a keyboard key to input a password. is there.

A keyboard having a mapping conversion function of the present invention includes a keyboard switch matrix having input keys and a keyboard controller, and the keyboard controller is connected to the keyboard switch matrix and input information input from the keyboard switch matrix; Determines whether the character information to be input subsequently is a key scan encoding unit for acquiring the key information, and whether the input information acquired by the key scan encoding unit is a key map generation instruction defined by a pre-assigned local hot key When the input information is a key map generation instruction, the local hot key recognition unit that recognizes the key map generation code from the input information , and when the input information is the key map generation instruction, the characters acquired by the key scan encoding unit information The key map for mappings, in correspondence to the key map generated code, and a key map generator for generating the random number, the generated key map key map generated code and the key map storage and conversion unit that stores in correspondence Have. The local hot key recognition unit determines whether the input information acquired by the key scan encoding unit is a key map selection instruction defined by a pre-assigned local hot key, and the input information is a key map selection instruction The key map selection code is recognized from the input information, and the key map storage / conversion unit stores the key map generation code corresponding to the key map selection code when the input information is a key map selection instruction. The keyboard controller has an interface unit that outputs the character information mapped by the key map storage / conversion unit to the outside .

The key map storage / conversion unit has a key map selection code register that records either no key map or key map selection code, and the key map storage / conversion unit has no key map in the key map selection code register. When recorded, the character information is output to the interface unit as it is. When the key map selection code is recorded, the character information is mapped to the interface unit by the key map corresponding to the recorded key map selection code. It may be output.

  The input information to the keyboard switch matrix input via the key scan encoding unit and mapped by the key map may be a character string for authentication, and the character string for authentication is used for personal authentication. May be the password.

  In the present invention, the password input from the keyboard is input by numbers and alphabets which are different from the ASCII keyboard (ISO 2126-1975, etc.) which is a normal key layout by mapping conversion. Even if the input operation is read, the correct password is not known, so that the security is enhanced.

  Further, the security enhancement of the keyboard according to the present invention can be realized by adding a function to the firmware of the keyboard controller, and thus can be widely implemented at a low cost.

  In the keyboard having the mapping conversion function of the present invention, switching of the keyboard mapping is specified by the local hot key of the keyboard, and the key input on the keyboard is mapped to the key input of another key map and output. Security is strengthened by preventing passwords from being read by people through key operations.

  Most of the security of a computer system is based on the input of an ID and a password from a keyboard. However, there is a risk that a password is read by a viewer by a key operation when inputting the password. The present invention can be realized by adding a function to the firmware of the keyboard controller, and can be widely implemented at low cost.

  Even if a third party can read the key entered from the operator's key operation, the key map of the keyboard is switched and entered only when entering the password, and the actual password entered in the system is not known. Even if a third party performs the same key operation from this terminal or another terminal, it cannot log in.

  Next, a configuration of a keyboard having a mapping conversion function to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a block configuration diagram showing an embodiment of a keyboard having a mapping conversion function to which the present invention is applied.

  As shown in FIG. 1, a keyboard 1 having a mapping conversion function according to the present invention includes a keyboard controller 10 and a keyboard switch matrix 11 in which key switches are arranged at intersections of drive line and sense line matrices. .

  The keyboard controller 10 drives the keyboard switch matrix 11 with the scan drive line 12, inputs the key pressing state of the keyboard switch matrix 11 with the scan sense line 13, performs internal processing, and outputs it to the external interface 14.

  The keyboard controller 10 includes a key scan encoding unit 101, a key map storage / conversion unit 102, an interface unit 103, a local hot key recognition unit 104, and a key map generation unit 105.

  The key scan encoding unit 101 drives the scan drive line 12 and transmits the key press state in the keyboard switch matrix 11 input from the scan sense line 13 to the local hot key recognition unit 104 and the key map storage / conversion unit 102. .

  The local hot key recognition unit 104 recognizes a combination of a plurality of specific keys of a keyboard that is not normally used as a local hot key (internal operation instruction that is not output to the outside of the keyboard), and in accordance with an instruction from the local hot key, a predetermined internal state And control of each part according to the internal state. As local hot keys, for example, key map generation instruction (key combination example: Ctrl + Shift + k), key map selection instruction (key combination example: Ctrl + Shift + l), key map release instruction (key combination) by the following key combinations, for example: Example: Ctrl + Shift +; The key combination is not limited to this.

  In the case of a key map generation instruction, the next input key is received as a key map generation code (for example, one letter), and then the key map generation instruction and the key map generation code are sent to the key map generation unit 105. When the key map generation unit 105 receives the key map generation instruction, the key map generation unit 105 generates a key map from the random numbers generated by the key map generation unit 105 and sends the key map to the key map storage / conversion unit 102. The key map storage / conversion unit 102 stores a key map in association with the key map generation code.

  In the case of a key map selection instruction, after the next key input is received as a key map selection code (for example, one letter), the key map selection instruction and the key map selection code are sent to the key map storage / conversion unit 102. send. The key map storage / conversion unit 102 clears the key map selection code register 1020 and stores the key map selection code.

  In the case of a keymap cancellation instruction, the local hot key recognition unit 104 instructs the keymap storage / conversion unit 102 to indicate no keymap. The key map storage / conversion unit 102 clears the key map selection code register 1020 and stores no key map.

  When a key map selection code is stored in the key map selection code register 1020, the key map storage / conversion unit 102 selects a stored key map according to the key map selection code and outputs the key map from the key scan encoding unit 101. When the input is converted and output to the interface unit 103 and no key map is stored in the key map selection code register 1020, the input from the key scan encoding unit 101 is output to the interface unit 103 without conversion. . That is, when no key map is stored, the key input from the normal keyboard 1 remains.

  The key map storage / conversion unit 102 stores the key maps 1021, 1022,... In a nonvolatile memory. At the time of manufacture, the automatically generated key map 1 1022 is set, and in addition, the key map generated by the key map generation unit 105 is stored as a key map in association with the key map generation code. The key map at the time of manufacture is not limited to one.

  The key map selection code register 1020 is used when the local hot key recognition unit 104 instructs the key map storage / conversion unit 102 to indicate no key map, and when the key map selection code register 1020 is initialized by the external interface 14 after power-on. Is also set without a keymap. Therefore, except when a key map selection instruction and a key map selection code are received from the local hot key recognition unit 104, the key map is set to no key map, and the input from the key scan encoding unit 101 is not converted and the interface unit is used as it is. To 103. The key map selection instruction and the key map selection code are received from the local hot key recognition unit 104 when the password is input from the normal keyboard switch matrix 11.

  The interface unit 103 outputs the output from the key map storage / conversion unit 102 to the external interface 14 according to a predetermined procedure with the outside. Further, when an initialization instruction is given from the external interface 14, each unit is initialized.

  An example of a key map stored in the key map storage / conversion unit 102 at the time of manufacture and a key map generated in the key map generation unit 105 are shown in FIG. 2A and 2B are schematic diagrams for explaining an example of a key map. FIG. 2A is an example of no key map, FIG. 2B is an example of a key map 1, and FIG.

  No key map (a) indicates a portion of 32 to 127 in decimal of the ASCII code table (ISO646 standard) (0 to 31 are not subject to mapping because of control codes), and key map 1 (b) and The key map 2 (c) has numbers 0 to 9 (48 to 57 in decimal), uppercase letters A to Z (65 to 90 in decimal), and lowercase letters a to z with respect to no keymap (a). (97 to 122 in decimal) is associated with other characters by random numbers.

  Here, the characters other than 10 numerals, 26 uppercase letters, and 26 lowercase letters are not used in the password and are therefore not converted. The key map generated by the key map generation unit 105 in response to the key map generation instruction is a set of 96 bytes (key map size S = 96). The configuration excluding non-conversion is a set of 62 bytes (key map size S = 62) of only numbers, uppercase letters, and lowercase letters. The key map storage / conversion unit 102 can store a plurality of sets of key maps in the nonvolatile memory.

  In the example of the key map of FIG. 2, the example of the key map 1 is that 65 “A” is mapped to “M” in the decimal of the ASCII code, and in the example of the key map 2 is also mapped to “C”. Represents what is being done. FIG. 2 shows the decimal correspondence of the ASCII code. The address calculation of the nonvolatile memory storing the key map is as follows.

  In the key map conversion operation of the key map storage / conversion unit 102, when no key map is stored in the key map selection code register 1020, conversion is not performed and the key map selection code register is output as it is to the interface unit 103. When the key map n is stored in 1020, the corresponding address (n-1) * S + K-32 of the key map n is calculated from the pressed key code K from the key scan encoding unit 101, and the data is read. Output. Here, for example, -32 indicates that the character code of the ASCII code starts with 32, so the key scan result “A” (ASCII code is 65 in decimal) is different from the key map (1 -1) Reads “M” at address * 96 + 65−32 = 33 (ASCII code is 77 in decimal) and outputs it to the interface unit 103. Similarly, in the example of the key map 2, “C” (ASCII code is 67 in decimal) at address (2-1) * 96 + 65−32 = 129 of the key map is read and output to the interface unit 103.

  As another configuration example of this apparatus, in FIG. 1, the key map generation unit 105 is omitted, and in the key map storage / conversion unit 102, the key map has only a key map fixed at the time of manufacture set in the ROM. . As a result, the mapping is fixed, but the cost can be reduced.

  Next, the operation of a keyboard having a mapping conversion function to which the present invention is applied will be described with reference to the drawings. FIG. 3 is a flowchart showing the operation of a keyboard having a mapping conversion function to which the present invention is applied.

  The power supply is supplied to the keyboard 1 having the mapping conversion function, or the operation starts from a reset by a reset instruction from the parent device connected to the keyboard 1 having the mapping conversion function (S51).

  A key scan is performed (S52), and when a key is pressed, a local hot key (key map generation instruction, key map selection instruction, key map release instruction) is determined based on the key value.

  In the case of a key map generation instruction (S53Y), a generation key map code designation standby state is set (S61), and the process returns to the key scan in step S52. If it is not a key map generation instruction (S53N), the process proceeds to step S54. If it is a key map selection instruction (S54Y), the selection key map code designation standby state is set (S62), and the process returns to the key scan of step S52. If it is not a key map selection instruction (S54N), the process proceeds to step S55. If the key map designation is canceled (S55Y), the key map designation is canceled and no key map is set in the key map selection code register 1020 (S63). Return to the key scan in step S52. If the key map designation is not cancelled (S55N), the process proceeds to step S56.

  Next, due to the internal state held in the local hot key recognition unit 104, when the generation key map code specification standby is in progress (S56Y), the key map generation unit 105 generates a key map using the pressed key n and generates a key. The data is stored in the key map n of the map storage / conversion unit 102 (S64), and the process returns to the key scan in step S52. If the generated key map code designation is not waiting (S56N), the process proceeds to step S57. When the selection key map code designation is on standby (S57Y), the key that is the pressed key map selection code is stored in the key map selection code register 1020, and the process returns to the key scan in step S52. If the selection key map code designation is not on standby (S57N), the process proceeds to step S58. When the key map code is being specified (S58Y), key mapping is performed (specifically, the key scan encoding unit 101 uses the key map n selected by the key map selection code register 1020 in the key map storage / conversion unit 102). (S66), the process proceeds to step S60. If no key mapping code is specified, no key mapping is performed (specifically, no key map is stored in the key map selection code register 1020 in the key map storage / conversion unit 102 and input from the key scan encoding unit 101). The data is adopted as it is) (S59), and the process proceeds to step S60. In step S60, the keyboard output 60 is performed, and the process returns to the key scan in step S52.

  When registering an authentication code such as a password in the parent device, use the keyboard of the present invention whose security is enhanced by the mapping conversion function, and use the local hot key and the key map selection code key in advance. A selection instruction is issued, a desired authentication code is input from the keyboard, and the input authentication code is mapped by the selected key map and registered in the parent device.

  When requesting authentication from the parent device, use the keyboard that has the key map at the time of registration, and select the key map at the time of registration using the local hot key of the key map selection instruction and the key of the key map selection code. When the authentication code used at the time of registration is input, the mapped code is input to the parent device, so that authentication is performed.

  Even if the input of the code for authentication to the keyboard is read from the outside, the registered authentication code is mapped, so input the input code for registration from any keyboard including the keyboard for registration. However, since authentication is not performed, security is enhanced. Even if the key map selection code key is read, a third party will be authenticated unless a key map selection instruction is issued by the local hot key using the keyboard that has the key map at the time of registration. There is no.

  The key map is a key map that was set when the keyboard was manufactured, and security is usually maintained. However, if you are unsure, you can create a new key map and store it. In addition, using a different key map for each function to be used and changing the authentication code will ensure more safety.

It is a block block diagram which shows embodiment of the keyboard provided with the mapping conversion function to which this invention is applied. It is a schematic diagram for demonstrating the example of a key map. (A) is an ASCII code table without a key map. (B) is an example of the key map 1. (C) is an example of the key map 2. It is a flowchart which shows operation | movement of the keyboard provided with the mapping conversion function to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Keyboard 10 Keyboard controller 11 Keyboard switch matrix 12 Scan drive line 13 Scan sense line 14 External interface 101 Key scan encoding part 102 Key map memory | storage part 103 Interface part 104 Local hot key recognition part 105 Key map generation part 1020 Key map selection Code register 1021 No key map 1022 Key map 1
Steps S51 to S66

Claims (4)

A keyboard switch matrix having input keys, and a keyboard controller;
The keyboard controller is
A key scan encoding unit connected to the keyboard switch matrix to obtain input information inputted from the keyboard switch matrix and character information inputted subsequently;
It is determined whether the input information acquired by the key scan encoding unit is a key map generation instruction defined by a pre-assigned local hot key, and the input is performed when the input information is the key map generation instruction A local hot key recognition unit for recognizing a key map generation code from information,
When the input information is the key map generation instruction, a key map for mapping the character information acquired by the key scan encoding unit is generated by a random number corresponding to the key map generation code A generator ,
A key map storage / conversion unit for storing the generated key map in association with the key map generation code ;
Have
The local hot key recognition unit determines whether the input information acquired by the key scan encoding unit is a key map selection instruction defined by a pre-assigned local hot key, and the input information is the key map Recognize the key map selection code from the input information when it is a selection instruction,
When the input information is the key map selection instruction, the key map storage / conversion unit stores the character in the key map stored in association with the key map generation code corresponding to the key map selection code. Mapping information,
The keyboard controller includes an interface unit that outputs the character information mapped by the key map storage / conversion unit to the outside .
Keyboard with mapping conversion function. The key map storage / conversion unit has a key map selection code register that records either no key map or the key map selection code,
The key map storage / conversion unit outputs the character information as it is to the interface unit when no key map is recorded in the key map selection code register, and when the key map selection code is recorded. Mapping the character information with the keymap corresponding to the recorded keymap selection code and outputting to the interface unit;
A keyboard comprising the mapping conversion function according to claim 1.   The keyboard having a mapping conversion function according to claim 1, wherein the character information is a character string for authentication.   4. The keyboard having a mapping conversion function according to claim 3, wherein the character string for authentication is a password for personal authentication.

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