Simple data anonymization

使用 Excel 或 MySQL 資料庫查詢方式，簡易地將個人資料去識別化 (將姓名馬賽克) 。

姓名的個資去識別化

case1: 王小明 --> 王O明; 孤獨求敗 --> 孤OO敗

Reserve the first and last characters of name, and replace other characters with the symbol 'OO'.

ex:

• 楊過 --> 楊O
• 王小明 --> 王O明
• 孤獨求敗 --> 孤OO敗
• Guo da-xia --> GOOOOOOOOa

methods:

• Excel:
  • =IF(LEN(A1)=2, LEFT(A1, 1)&"O", LEFT(A1, 1)&REPT("O", LEN(A1)-2)&RIGHT(A1, 1))
  • =REPLACE(A1, 2, 1, "O") only applied for 3 characters, NOT for 4 characters
• PHP: using regular_replace

if(mb_strlen($string, "UTF-8") == 2){
   echo mb_substr($string, 0, 1, "UTF-8") . "O";

}else{
  $pattern = '/^(\X)(\X+)(\X)/u';
  preg_match($pattern, $string, $matches);
  echo $matches[1]. str_repeat("O", mb_strlen($string, "UTF-8") - 2) . $matches[3];

}

• MySQL:

SET @name := "楊過";
-- SET @name := "王小明";
-- SET @name := "孤獨求敗";
-- SET @name := "Guo da-xia";

SELECT CASE  
    WHEN CHAR_LENGTH(@name) =2 THEN CONCAT(LEFT(@name, 1), 'O')
    ELSE CONCAT(LEFT(@name, 1), REPEAT('O', CHAR_LENGTH(@name)-2), RIGHT(@name, 1))
    END;

case2: 王小明 --> 王O明; 孤獨求敗 --> 孤O敗

ex:

• 楊過 -> 楊O
• 王小明 --> 王O明
• 孤獨求敗 --> 孤O敗
• Guo da-xia --> GOa

methods

• Excel:
  • =IF(LEN(A2)=2, LEFT(A2, 1)&"O", LEFT(A2, 1)&REPT("O", 1)&RIGHT(A2, 1)) also applied for 3 or 4 characters

case3: 王小明 --> 王OO; 孤獨求敗 --> 孤OO

Reserve the first character of name, and replace other characters with the symbol 'OO'.

ex:

• 楊過 -> 楊OO
• 王小明 --> 王OO
• 孤獨求敗 --> 孤OO
• Guo da-xia --> GOO

methods

• Excel:
  • =REPLACE(A2, 2, LEN(A2)-1, "OO") also applied for 3 or 4 characters
  • =REPLACE(A2, 2, 2, "O") only applied for 3 characters, NOT for 4 characters
• MySQL:

-- SET @name := "楊過";
SET @name := "王小明";
-- SET @name := "孤獨求敗";
-- SET @name := "Guo da-xia";

SELECT CONCAT(LEFT(@name, 1), 'OO');

case4: 王小明 --> 王OO; 孤獨求敗 --> 孤OO敗

Replace the second and third characters with the symbol 'OO', and reserve other characters.

• 楊過 --> 楊OO
• 王小明 --> 王OO
• 孤獨求敗 --> 孤OO敗
• Guo da-xia --> GOO da-xia

methods:

• Excel
  • =REPLACE(A1, 2, 2, "OO")

• PHP

//$string = '楊過';
$string = '王小明';
//$string = '孤獨求敗';
//$string = 'Guo da-xia';

$pattern = '/^(\X)(\X\X?)(\X?)/u';
$replacement = '$1OO$3';
echo preg_replace($pattern, $replacement, $string);

• MySQL

-- SET @name := "楊過";
SET @name := "王小明";
-- SET @name := "孤獨求敗";
-- SET @name := "Guo da-xia";

SELECT CONCAT(LEFT(@name, 1), 'OO', RIGHT(@name, CHAR_LENGTH(@name)-3));

手機號碼的個資去識別化

case1: 0912345678 --> 09123XXXXX8

methods:

• Excel
  • =LEFT(A2, 5)&REPT("X", 5)&RIGHT(A2, 1)

References

further reading

• 個資利用與去識別化 - vTaiwan.tw
• 淺談個資遮罩

related terms

• Data masking (資料遮罩)