The 18 identity card standards made a clear provision in GB11643-1999 "Citizen ID" implemented on July 1, 1999. GB11643-1999 "Citizenship Number" is the revision of the "Social Security Number", which points to the original standard name "Social Security Number" is renamed "Citizenship Number", and the GB11643-1999 "Citizen ID Number" Instead of GB11643-1989 from the date of implementation. GB11643-1999 The main contents of "Citizenship Number" are as follows: 1. Range The standard specifies the coding object, number of citizen numbers, and the structure and performance form of the number, enabling each encoding object to get a unique, unchanged legal number. Second, the encoding object of coding object citizenship number is a citizen with nationality of the People's Republic of China. Third, the structure and representation of the number 1, the number of the citizenship number of the number is the characteristic group code, consisting of the seventeenth digital body code and a check code. Arrange the order from left to right as: six digit address code, eight digit born date code, three digital sequence code and one digital check code. 2, address code represents administrative division code of the county (city, flag, district) of the coded object, and is implemented in accordance with the provisions of GB / T2260. 3. The birth date indicates the year, month, day, and according to the provisions of the GB / T7408, the year, month, and Japanese code shall not be separated from the date, month, month. 4, the sequence code indicates the sequence number of the same year, the same month, the same day, the odd number of the sequence code, the odd number of sequence codes, the odd number of sequence codes to women, even if the sequence code is assigned to the male. 5, check code (1) seventeen digital body code weighted summation and formula S = SUM (AI * Wi), i = 0, ..., 16, first on the top 17 digits and AI: Identity card number in the first location WI: Represents the weighting factor Wi: 7 9 10 5 8 4 2 1 6 3 7 9 10 5 8 4 2
(2) Calculation model Y = mod (s, 11)
(3) Get the corresponding check code y: 0 1 2 3 4 5 6 7 8 9 10 Check code: 1 0 x 9 8 7 6 5 4 3 2, for example: Beijing Chaoyang District: 11010519491231002X Shantou City, Guangdong Province: 440524188001010014
According to the provisions of the citizen identity number in the National Standard GB 11643-1999 in the People's Republic of China, the citizen identity number is the characteristic group code, consists of the seventeenth digital body code and a digital check code. Arrange the order from left to right as: six digit address code, eight digit born date code, three digital sequence code and one digital check code.
The address code represents the administrative region of the county (city, flag, district) in the county (city, flag, district) of the coding object. The birthday period indicates the year, month, day of the birthday, month, and the year, the year, the year, month, and day without separator. The sequence code indicates the sequence number of the person born in the same year, month, and day. The odd number of sequence codes is given to men, even giving women. The check code is based on the seventeenth digit of the previous seventeen digits, calculated by the ISO 7064: 1983.MOD 11-2 check code. The calculation method will be described below.
15 identity card coding first expanded the birth year to 4 digits, simple is to increase a 19, but this is not used for people born in 1900 (such birthday is not much)
A male citizenship number is 34052419800101001, first, according to formula (1):
Σ (AI × Wi) (MOD 11) ........................................ (1)
Equation (1): i ---- Indicates the number character from the zip number, including the calibration code; AI ---- represents the number character value at the first position; Wi ---- show The weighting factor at the i position is calculated based on the formula Wi = 2 (N-1) (MOD 11). I 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Ai 3 4 0 5 2 4 1 9 8 0 0 1 0 1 0 0 1 A1
Wi 7 9 10 5 8 4 2 1 6 3 7 9 10 5 8 4 2 1
Ai × Wi 21 36 0 25 16 16 2 9 48 0 0 9 0 5 0 0 2 A1
Calculated according to equation (1):
Σ (AI × Wi) = (21 36 0 25 16 16 2 9 48 5 0 0 2) = 189
189 ÷ 11 = 17 2/11
Σ (AI × Wi) (MOD 11) = 2
The corresponding check code is then isolated from the following table according to the calculated result, where x represents the calculation result 10:
Σ (AI × Wi) (MOD 11) 0 1 2 3 4 5 6 7 8 9 10 Check code character value AI 1 0 x 9 8 7 6 5 4 3 2 According to the top table, the calculation result is 2 schools The code for the citizenship number of the person should be 34052419800101001x.
The above is reproduced (Sorry where to find it), the following is based on a check class written by the original text, and automatically convert 15 points into 18 digits. --------------- -------------------------------------------------- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ /// public class IdentityCard {private string cid_; private string errmsg; private string [] aCity; public IdentityCard () {aCity = new string [] {null, null, null, null, null, null, null , NULL, NULL, NULL, NULL, "Beijing", "Tianjin", "Hebei", "Shanxi", "Inner Mongolia", NULL, NULL, NULL, NULL, NULL, "Liaoning", "Jilin", "Heilongjiang" NULL, NULL, NULL, NULL, NULL, NULL, NULL, "Shanghai", "Jiangsu", "Zhejiang", "Anwei", "Fujian", "Jiangxi", "Shandong", NULL, NULL, NULL, "Henan", "Hubei", "Hunan", "Guangdong", "Guangxi", "Hainan", NULL, NULL, NULL, "Chongqing", "Sichuan", "Guizhou", "Yunnan", "Tibet", NULL, NULL, NULL, NULL, NULL, NULL, "Shaanxi", "Gansu", "Qinghai", "Ningxia", "Xinjiang", NULL, NULL, NULL, NULL, NULL, "Taiwan", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "Hong Kong", "Macau", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "Foreign"}};} (String CardID) ) {CID = cardid; returnck ();} public bool check () {// judgment bits IF (Cid.Length == 15) {Return Check15 ();} else if (Cid.length == 18) { Return CHECK18 (CID); Else {errmsg = "The number of ID cards is incorrect";}}
Public Bool CHECK18 (String CID) {Double ISUM = 0; // String Info = ""; System.Text.RegularExpressions.Regex Rg = New System.Text.RegularExpressions.Regex (@ "^ / D {17} (/ D | x) $ "); System.Text.RegularExpressions.match mc = rg.match (CID); if (! mc.success) {errmsg =" ID card input error "; Return False;} CID = Cid.Tolower ); CID = CID.Replace ("x", "a"); if (ACIT.Substring (0, 2))] == null) {errmsg = "illegal region"; RETURN FALSE; } Try {datetime.parse (Cid.Substring (6, 4) "-" Cid.Substring (10, 2) "-" Cid.Substring (12, 2));} catch {errmsg = "illegal Birthday "; return false;} for (int i = 17; i> = 0; I -) {isum = (System.math.Pow (2, i)% 11) * int.parse (CID [17- I] .tostring (), system.globalization.numberStyles.HexNumber;} if (isum% 11! = 1) {Errmsg = "illegal card number"; returnaf false;} // return ""; string xx; int SEX = int.Parse (16,1))% 2; if (sex == 1) {xx = "male";} else {xx = "female";} errmsg = (ACITY [INT.PARS) Cid.Substring (0, 2))] "," Cid.SUBST Ring (6,4) "-" Cid.Substring (10, 2) "-" Cid.Substring (12, 2) "," XX); Return True;}
Public Bool CHECK15 () {string [] verifyid = new string [] {"0", "1", "2", "3", "5", "6", "7", "8 "," 9 "," x "}; cid = cid.substring (0,6) " 19 " cid.substring (6,9); foreach (string vid in verify) {bool result = check18 (CID VID); if (result) {errmsg = "Your card ID:" CID VID; return true;}} return false;} public string cid {get {return cid_;} set {CID_ = value;}} public string Errmsg {get {return errmsg;} set {errmsg = value;}}}}
