18位身份证号码校验位规则（18 bit number check digit rule）.docVIP

18位身份证号码校验位规则（18 bit number check digit rule） 18 check the identity card number rule 2009/01/11 15:33 according to the provisions relating to the citizens of Peoples Republic of China in the national standard GB 11643-1999 identification number, citizenship number is the combination code, consisting of seventeen bit digital ontology yards and a digital check code. The order from left to right: six digit address code, date of birth eight digital code, three digit sequence and a digital code. Address code encoding object where the permanent residence of the county (city, District, its administrative division code). Date of birth code encoding object birth year, month, day, and year with four digits, each year, month, day no separator. In order to express the same code identifies the address code within the region, the sequence number of born of the same year, month and day of the scheduled staff. In order to code the odd men, even to the female. Check code according to the front seventeen digit code, calculated according to the ISO 7064:1983.MOD 11-2 check code check code. The following example illustrates the calculation method. ID encoding 15 bits of first year of birth is extended to 4 bits, simply add a 19, but it is for those born in 1900 (without the use of such longevity is not much) A male citizen identity number body code is 34052419800101001, according to the calculation formula: Sigma (AI * Wi) (MOD 11).......................................... (1) The formula (1): I---- said the position number number of characters from right to left, including the check code; Ai---- said the I position on the number of character value; Wi---- showed I weighted factor position, its value according to the formula Wi=2 (n-1) (MOD 11) calculated. I 1817161514131211 109876543 21 AI80010100 1 A1 Wi 791058421 637910584 21 AI * Wi 2136025161629 480090500 2 A1 According to the calculation formula (1): Sigma (AI * Wi) = (21+36+0+25+16+16+2+9+48++0+0+9+0+5+0+0+2) = 189 189