JP2007102540A - Character string conversion device and character string conversion program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a character string conversion device including a mask processing means masking a character string corresponding to personal information, in which restoration to an original character string can be performed based on a character string after conversion while reducing the leakage risk of personal information. <P>SOLUTION: The character conversion device stores a plurality of programs 31-35 as conversion processing means and a plurality of tables 36-38 as conversion character lists in a program memory 30. In the conversion device, it is determined whether a character contained in a designated mask range is matched to a character contained in each table or not, and when the both are matched, this character is converted to another character in the corresponding table according to a preliminarily defined conversion rule. As restoration processing, each converted character string is restored to a character string before conversion according to the conversion rule. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a character string conversion device, and more particularly to character string conversion for protecting personal information such as a personal name.

Conventionally, as a technique for making personal names private in order to protect personal information, a means for converting a character string indicating a personal name included in an electronic document into another character string as a mask process is provided. The structure is publicly known (for example, see Patent Document 1).
JP 2002-149638 A

  In the configuration described in Patent Document 1, a character string to be masked is extracted based on a proper noun dictionary, and the extracted character string is converted into another character string, thereby making it impossible to specify a personal name or the like. Yes. For example, the personal name “Taro Yamada” is converted into a character string such as “****” or “person name 1”.

However, in the configuration described in Patent Document 1, it is not considered to restore the original character string of the character string that has been subjected to the conversion process. That is, when all character strings indicating personal names or the like are converted into a common character string (for example, “****”), it is impossible to restore the original character string. Therefore, it is necessary to retain the original electronic document in order to confirm the content before conversion, and the risk of leakage of personal information cannot be reduced.
Further, even when the personal name is converted to “person name 1” or the like, correspondence information between at least the character string before conversion (name) and the character string after conversion (such as “person name 1”) may be stored. It is necessary and has the risk of leakage almost the same as the case of holding the electronic document before conversion.

  The present invention is to solve the above-mentioned problem, and in a character string conversion device provided with conversion processing means for a character string designated as a conversion processing target as corresponding to personal information or the like, An object of the present invention is to provide a character string conversion device that enables restoration to an original character string based on a column and also reduces the risk of leakage of personal information.

In order to solve the above problems, the character string conversion device of the present invention is a character string conversion device that converts a character string in an electronic document designated as a conversion processing target into another character string, and a conversion character in advance, A character list that defines an identifier for uniquely identifying each conversion character and an input of a conversion instruction are received, and each character included in the character string as the conversion target is searched from the character list and converted from the character list. Based on an identifier assigned to the target character, means for converting to another character in the character list according to a predefined conversion rule, and accepting an input of a restoration instruction, and the converted character corresponds to the conversion rule Means for restoring to a conversion target character included in the character list according to the restored rule.
The conversion rule may be arbitrarily selected from a plurality of predefined conversion rules or a combination thereof.
A character string conversion program according to the present invention is a character string conversion program for causing a computer to execute a process of converting a character string in an electronic document designated as a conversion processing target into another character string. An input is received, and each character included in the character string as the conversion target is searched from a character list in which conversion characters are stored in advance, and is defined in advance based on an identifier assigned to the conversion target character from the character list. A process of converting to another character in the character list according to a conversion rule and an input of a restoration instruction are accepted, and the character after conversion is included in the character list by the restoration rule corresponding to the conversion rule. It is characterized by causing a computer to execute the process of restoring to.
The conversion rule may be arbitrarily selected from a plurality of predefined conversion rules or a combination thereof.

With the above configuration, in the present invention, it is possible to restore a converted character string to a character string before conversion based on a character list and conversion rules for an electronic document converted from a character string indicating personal information or the like. Become. Therefore, by sharing the character list and the conversion rule, it is possible to confirm the content before conversion of the document with the personal information masked in a plurality of terminals.
As a result, for example, when a message input from a portable terminal or a PC (personal computer) is transmitted and received between terminals using e-mail or the like, the transmitting side converts the original character string of the input character string into the character string. After conversion by the device, the converted message is sent, and the received message is restored by the character string conversion device on the receiving side, so that the transmission in the case of using a network such as the Internet as the transmission path This contributes to a reduction in the possibility that the content of the message inside will be leaked.

Hereinafter, a character string conversion device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a character string conversion apparatus according to an embodiment of the present invention.
The character string conversion device according to the present embodiment includes an input device 10 for inputting characters, a central processing device 20 for executing character string conversion processing, various programs necessary for processing in the central processing device 20, and various management tables. A program memory (ROM) 30 for storing the data, a data memory (RAM) 40 as temporary storage means for storing the input data from the input device 10, the mid-processing / result data in the central processing device 20, and the central processing And an output device 50 that outputs a character string created by the device 20. The character string conversion apparatus of this example performs conversion processing on a character string designated as a conversion processing target in an electronic document.
The program memory 30 relates to a character string conversion process, a character string conversion program 31 as a conversion processing means, a single character conversion program 32, a hiragana katakana conversion program 33, a kanji conversion program for personal names 34, and a JIS first level 2 kanji conversion program 35. And a hiragana / katakana table 36, a personal name kanji table 37, and a JIS first and second level kanji table 38 as a conversion character list.
In the hiragana katakana table 36, numbers corresponding to Japanese hiragana and katakana and vowels / consonants are stored in advance.
In the personal name kanji table 37, common kanji that can be used for personal names according to the family register method and the like, and 2232 characters according to personal name kanji are stored in advance.
In the JIS first and second level kanji table 38, kanji characters determined by the JIS standard are stored in advance.
In the data memory 40, a mask instructed to mask or restore the pre-conversion character 41 input from the input device, the post-conversion character string 42 after conversion processing, and the character string input from the input device. It is assumed that the restoration flag 43 is stored.
In the character string conversion device according to the present embodiment, it is determined whether or not the characters included in the specified mask range match the characters included in each table. If they match, a predefined conversion rule is determined. To convert to other characters in the table. Further, as a restoration process, each converted character string is restored to a character string before conversion according to a restoration rule corresponding to the conversion rule.

FIG. 2 is a diagram showing an example of the hiragana katakana table 36 and a conversion example using the hiragana katakana table shown in this example.
In the hiragana katakana table 36 shown in this example, each character can be identified by a combination of numbers (01 to 11) corresponding to consonants and numbers (01 to 05) corresponding to vowels.
For example, “ta” in the pre-conversion character string 210 “Tanaka Ichiro” is indicated by “0401” because the consonant is “04” and the vowel is “01”.
On the other hand, in the conversion example, it is assumed that “the number corresponding to the consonant” is counted up as a conversion rule.
In this case, “ta” is converted to “na” in the pre-conversion character string 210. Similarly, by performing the conversion process, “Tanaka Ichirou” shown in the pre-conversion character string 210 is converted into “Nahanasaki nioku” shown in the post-conversion character string 220.
Note that in the restoration process, the conversion process is performed by counting down the “number corresponding to the consonant”, which is the reverse process of the conversion rule.
In this example, only hiragana is shown, but conversion processing is also performed for katakana using a table having a similar data structure.

FIG. 3 is a diagram showing an example of a personal name kanji table and a conversion example using the personal name kanji table shown in this example.
In the personal name Chinese character table 300 shown in this example, the personal Chinese characters are arranged in the order of the character codes, and an identification number is assigned to each character.
On the other hand, in the conversion example, it is assumed that counting up an identification number is defined as a conversion rule.
In this case, “Ta” of “Ichiro Tanaka” in the pre-conversion character string 310 is converted to “den”. Similarly, by performing the conversion process, “Ichiro Tanaka” shown in the pre-conversion character string 310 is converted into “Den-Nakarou” shown in the post-conversion character string 320.
In the restoration process, the identification number is counted down to perform the conversion process.

FIG. 4 is a diagram showing an example of a JIS first level kanji table and a conversion example using the JIS first second level kanji table shown in this example.
In the JIS first and second level kanji table 400 shown in this example, kanji are arranged in the order of JIS character codes, and an identification flag for identifying whether or not the kanji is included in the personal name kanji table is set.
On the other hand, in the conversion example, it is defined that the JIS character code is counted up as a conversion rule and that the JIS character code is further counted up when the converted character is included in the personal name kanji table. Shall.
In this case, “唖” of “唖 阿 逢 渥” in the pre-conversion character string 410 is converted to “娃”. Similarly, by performing the conversion process, “唖 阿 唖” shown in the pre-conversion character string 410 is converted to “に dust 葵 Asa” shown in the post-conversion character string 420.
In the restoration process, the conversion process is performed by counting down the JIS character code.

Based on the above configuration, processing performed by the character string conversion apparatus according to the present embodiment will be described.
FIG. 5 is a flowchart showing processing of the character string conversion program 31 constituting the character string conversion device.
The character string conversion program 31 receives the input of the character string designated as the conversion processing target and the mask / restoration processing instruction, and saves the respective data as the pre-conversion character string 41 and the mask / restoration flag 43 in the data memory 40 ( Step 501).
Thereafter, the number of input character strings is calculated (step 502), and the following processing is performed for each character.
It is determined whether or not conversion processing for the number of input character strings has been completed (step 503). If conversion processing has not been completed, the single character conversion program 32 executes processing for unprocessed characters (step 504), and conversion is performed. After the converted character is stored in the data memory 40 as the converted character string 42, the process returns to the determination in step 503.
On the other hand, if it is determined in step 503 that conversion processing for the number of input character strings has been completed, output processing of the converted character string 42 is performed (step 505), and the processing ends.

FIG. 6 is a flowchart showing the processing of the single character conversion program 32.
The single character conversion program 32 searches whether the processing target character passed from the character string conversion program 31 is in the hiragana-katakana table 36 (step 601).
The result of the search in step 601 is determined (step 602). If the result is found in the hiragana / katakana table 36, the hiragana / katakana conversion program 33 is caused to execute processing (step 203).
On the other hand, if it is determined in step 602 that the character is not in the hiragana-katakana table 36, it is searched whether it is in the personal name kanji table 37 (step 604).
The result of the search in step 604 is determined (step 605). If it is found in the personal name kanji table 37, the personal name kanji conversion program 34 is caused to execute processing (step 606).
On the other hand, if it is determined in step 605 that the name is not in the personal name kanji table 37, it is searched whether it is in the JIS first and second level kanji table 38 (step 607).
The result of the search in step 607 is determined (step 608), and if it is in the JIS first second level kanji table 38, the JIS first second level kanji conversion program 35 executes the process (step 609).
On the other hand, if it is determined in step 608 that there is no JIS first second level kanji table 38, the conversion process is not performed and the process is terminated (step 610).

FIG. 7 is a flowchart showing the processing of the hiragana / katakana conversion program 33.
The hiragana katakana character conversion program 33 acquires the consonant + vowel numerical value from the hiragana katakana table 36 for the processing target character passed from the single character conversion program 32 (step 701). For example, in the hiragana katakana table 36 shown in FIG. 2, when the character to be processed is “ta”, the consonant + vowel is “0401”.
Next, the mask / restoration flag 43 in the data memory 40 is determined (step 702). If it is a mask processing instruction, the consonant value is counted up (step 703). In the above example, the numerical value is “0501”.
Next, the value of the consonant counted up in step 703 is compared with the range of the hiragana katakana table 36 (step 704). If the counted consonant value exceeds the range of the hiragana katakana table 36, the value of the consonant is displayed. Is the first numerical value (step 705). For example, in the example of FIG. 2, when the counted up value is “1201”, it is set to “0101”.
Based on the numerical value of consonant + vowel calculated in step 703 or 705, the corresponding character is acquired from the hiragana-katakana table 36 (step 706). In the above example, since the numerical value is “0501”, “NA” is acquired as the corresponding character.
Finally, the character is replaced with the character acquired in step 309 (step 707) and passed to the character string conversion program 31.
On the other hand, if the determination result in step 702 is a restoration instruction, the numerical value of the consonant is counted down (step 708). In the above example, if it is “TA”, the consonant + vowel is “0401”, and thus “0301”.
Next, as in step 703, the ranges of the katakana table 36 are compared (step 709), and if the counted down consonant value exceeds the range of the hiragana katakana table 36, the consonant value is set as the final value ( Step 710). For example, in the example of FIG. 2, when the counted down value is “0001”, it is set to “1101”.
The processing in steps 706 and 707 is performed based on the consonant + vowel value calculated in step 708 or 710.

FIG. 8 is a flowchart showing the processing of the personal name kanji conversion program 34.
The personal name kanji conversion program 34 acquires an identification number from the personal name kanji table 37 for the processing target character passed from the single character conversion program 32 (step 801). For example, in the personal name kanji table shown in FIG. 3, when the character to be processed is “ta”, the identification number is “1350”.
Next, the mask / restoration flag 43 in the data memory 40 is determined (step 802), and if it is a mask processing instruction, the numerical value of the identification number is counted up (step 803). In the above example, the numerical value is “1351”.
Next, the numeric value of the identification number counted up in step 803 is compared with the range of the personal name kanji table 37 (step 804). If the numeric value of the identification number counted up exceeds the range of the personal name kanji table 37, The numerical value of the identification number is set as the first numerical value (step 805). For example, in the example of FIG. 3, if the counted up value is “2233”, it is set to “0001”.
Based on the identification number calculated in step 803 or 805, the character corresponding to the personal name kanji table 37 is acquired (step 806). In the above example, since the numerical value is “1351”, “den” is acquired as the corresponding character.
Finally, the character is replaced with the character acquired in step 809 (step 807) and transferred to the character string conversion program 31.
On the other hand, if the determination result in step 802 is a restoration instruction, the numerical value of the identification number is counted down (step 808). In the above example, if the field is “field”, the numerical value of the identification number is “1350”, and thus “1349”.
Next, as in step 803, the ranges of the personal name kanji table 37 are compared (step 809), and if the counted down identification number exceeds the range of the personal name kanji table 37, the identification number is entered into the personal name kanji table. The final value is 37 (step 810). For example, in the example of FIG. 3, when the counted down value is “0000”, it is set to “2232”.
Steps 806 and 807 are performed based on the numerical value of the identification number calculated in step 808 or step 810.

FIG. 9 is a flowchart showing the processing of the JIS first and second level kanji conversion program 35.
The JIS first second-level kanji conversion program 35 acquires the corresponding character code (hexadecimal) from the JIS first second-level kanji table 38 for the processing target character passed from the one-character conversion program 32 (step 901). . For example, in the JIS first and second level kanji table shown in FIG. 4, when the processing target character is “唖”, the character code is “3022”.
Next, the mask / restoration flag 43 in the data memory 40 is determined (step 902), and if it is a mask processing instruction, the numerical value of the character code is counted up (step 903). In the above example, the numerical value is “3023”.
Next, the character code counted up in step 903 is compared with the range of the JIS first second level kanji table 38 (step 904), and the value of the counted character code is the range of the JIS first second level kanji table 38. Is exceeded, the character code is set to the first numerical value (step 905). For example, in the example of FIG. 4, when the counted character code value is “7426”, it is set to “3021”.
It is determined whether or not the personal name kanji identification flag is set for the character code acquired in step 903 or step 905 (step 906). Repeat the process.
On the other hand, if the personal name kanji flag is not set, the character corresponding to the character code is obtained from the JIS first and second level kanji table 38 (step 907). In the above example, since the numerical value of the character code is “3023”, “娃” is acquired as the corresponding character.
Finally, the character acquired in step 907 is replaced (step 908) and passed to the character string conversion program 31.
On the other hand, if the determination result in step 902 is a restoration instruction, the numerical value of the character code is counted down (step 909). If “唖” in the above example, the numerical value of the character code is “3022”, so “3021”.
Next, as in step 904, the range of the JIS first level kanji table 38 is compared (step 910), and the value of the counted down character code exceeds the range of the JIS first second level kanji table 38. Uses the character code as the final numerical value (step 911). For example, in the example of FIG. 4, when the counted down character code is “3020”, it is set to “7426”.
It is determined whether or not the personal name kanji identification flag is set for the character code acquired in step 909 or 911 (step 912). If the personal name kanji identification flag is set, the process proceeds from step 907. Repeat the process.
On the other hand, if the personal name kanji identification flag is not set, the processing of steps 907 and 908 is performed.

  As described above, in the character string conversion device according to the present embodiment, the character string indicating personal information is masked in accordance with a predefined character list and conversion rules. Based on the above, it is possible to restore the character string before conversion.

  The character list and conversion rules in the character string conversion device of the present invention are not limited to those shown in the above-described embodiment, and various types can be defined. In this case, conversion rules may be arbitrarily selected from a plurality of conversion rules, or a conversion process may be performed by combining a plurality of conversion rules.

It is a block diagram which shows schematic structure of the character string converter which concerns on one embodiment of this invention. It is a figure which shows the example of a character string conversion using the hiragana katakana table and it. It is a figure which shows the kanji table for personal names, and the character string conversion example using the same. It is a figure which shows the example of a character string conversion using the JIS 1st 2nd level Kanji table. It is a flowchart which shows the process which a character string conversion program performs. It is a flowchart which shows the process which a single character conversion program performs. It is a flowchart which shows the process which a hiragana katakana conversion program performs. It is a flowchart which shows the process which the Chinese character conversion program for personal names performs. It is a flowchart which shows the process which a JIS 1st 2nd level kanji conversion program performs.

Explanation of symbols

10 input device, 20 central processing unit, 30 program memory, 31 character string conversion program, 32 single character conversion program, 33 hiragana katakana conversion program, 34 personal name kanji conversion program, 35 JIS first level 2 kanji conversion program, 36 hiragana Katakana table, 37 Kanji table for personal names, 38 JIS first level 2 Kanji table, 40 data memory, 41 pre-conversion character string, 42 post-conversion character string, 43 mask / restore flag, 50 output device.

Claims (4)

A character string conversion device for converting a character string in an electronic document designated as a conversion processing target into another character string,
A character list that defines conversion characters and identifiers that uniquely identify each conversion character;
Accepting input of conversion instruction, searching each character included in the character string as the conversion target from the character list, based on an identifier assigned to the conversion target character from the character list, according to a predefined conversion rule Means for converting to other characters in the character list;
A character string conversion apparatus comprising: means for receiving an input of a restoration instruction and restoring the converted character to a conversion target character included in the character list according to a restoration rule corresponding to the conversion rule.   The character string conversion device according to claim 1, wherein the conversion rule is arbitrarily selected from a plurality of predefined conversion rules or a combination thereof. A character string conversion program that causes a computer to execute processing for converting a character string in an electronic document designated as a conversion processing target into another character string,
Receiving input of conversion instruction, each character included in the character string as the conversion target is searched from a character list in which conversion characters are stored in advance, and based on an identifier given to the conversion target character from the character list, A process of converting to another character in the character list according to a defined conversion rule;
A character string characterized by receiving an input of a restoration instruction and causing a computer to execute a process of restoring the converted character to a conversion target character included in the character list according to a restoration rule corresponding to the conversion rule Conversion program. The character string conversion program according to claim 3, wherein the conversion rule is arbitrarily selected from a plurality of predefined conversion rules or a combination thereof.

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