身份證的秘密 (三) 唔信try try!括號內的數字可計出來

文:
2014.12.18

介紹完電碼【詳看另文: 原來每人出生後都有一組摩斯密碼】及身份證英文字母 【詳看另文: 知道嗎?你身份證號碼的英文字 其實有意思 】怎樣出現後,這次告訴你原來身份證號碼括號內的數字其實也可計算出來。

之前小妹一直不明白,身份證號碼括號內的數字究竟有何用?因為有時候填寫個人資料,不用提供括號內的數字,感覺上這個括號內的數子好像可有可無。但之後發現原來這個數字是身份證的驗證碼,是可計算出來的,目的是為了讓官方確認身份證的真偽。

括號內數字的算式:

英文字母轉為數值的規律:
A=1, B=2, C=3, ......Y=25, Z=26

身份證有7個位,第1個位 x8;第2個位 x7;第3個位 x6;......最後第7個位 x2

依上述身份證的例子:
1x8 + 1x7 + 2x6 + 3x5 + 4x4 + 5x3 + 6x2 = 85

85要加上3才能被11整除,故該身份證最後括號內的驗證碼是:3

即該身份證的號碼是:A123456 (3);如果要加上 10 才能被整除的話,那括號內的數字就是 A 了,此算式萬試萬靈,不信的可試試計算啊!

文:CC

相關連結

>> 身份證的秘密 (一) 知道嗎?你身份證號碼的英文字 其實有意思
>> 身份證的秘密 (二) 原來每人出生後都有一組摩斯密碼

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