The "X" at the end of the ID card does not read "cross", nor does it read "Ex", what is the correct way to pronounce it
The "X" in the ID number is not added arbitrarily, as a check code, and is not pronounced as "cross" or "ex", so what is the correct pronunciation of "X"?
It's the 10 in Roman numerals, so how does the "X" as a checksum work?
As a kind of identity proof for mainland citizens, the number composition, verification principle and pronunciation rules of the ID card are all stipulated by the state, and understanding the constituent elements in the ID card number is helpful to maintain the security of personal information and correctly convey personal information.
1. Why do you need to set up a check code?
The ID number is composed of 18 digits and an "X" or "x", where each digit represents different information, and the "X" is used as a check code to verify the legitimacy of the number, so what is the composition of the ID number?
And how to verify the legitimacy of the number through the check code?
The ID card number is composed of four parts, namely: area code, date of birth, sequence code and check code, of which the area code is composed of 6 digits, the date of birth is composed of 8 digits, the sequence code is composed of 3 digits, and the check code is composed of 1 digit and a letter "X" or "x".
Therefore, in ordinary life, as long as you follow the first 17 digits of the ID number, you can intuitively see what information is contained in the ID number, so as to avoid the wrong information transmission caused by wrong pronunciation.
So how to verify the legitimacy of the number through the check code? In the ID number, the first 17 digits need to participate in the calculation, and the last digit is used to verify whether the first 17 digits are legitimate, and when we apply for an ID card, we do not fill in at random, but provide our own information according to the relevant national regulations, and then generate the number by the relevant departments.
When the number is generated, it will be calculated according to the composition and verification principle of the ID card number to ensure that the generated ID number is legitimate, and also avoid the same situation in some ID numbers.
Taking the 14th to 17th digits of the ID number as an example, assuming that the four digits are A1, A2, A3, and A4, then when generating the number, you need to multiply A1, A2, A3, and A4 by the coefficients on the corresponding positions in turn, and then add the product results.
The coefficients are 1, 0, x9, x8, x7, x6, x5, x4, x3, x2, where x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13 are numbers divisible by 17, and x0 is divisible by 11, so that the first 17 digits are random.
So now we need to sum the product result, assuming that the sum result is b, then b performs a remainder operation on 11, and the remainder obtained is c, and then according to c to determine what the check code is?
When C is 0, then the check code is 0, when C is 1, then the check code is 1, when C is 2, then the check code is 2, when C is 3, then the check code is 3, when C is 4, then the check code is 4, when C is 5, then the check code is 5, when C is 6, then the check code is 6, when C is 7, then the check code is 7, when C is 8, then the check code is 8, when C is 9, then the check code is 9, when C is 10, then the check code is X.
Therefore, the check code is prescribed by the state, pronounced "shí", which represents the 10 in the Roman numerals, and is not added at random, so why should the check code be set in the ID card?
The function of the check sum is mainly twofold: one is to reduce human error, and the other is to improve the accuracy and security of information.
When applying for an ID card, when the staff helps us fill in the application form, we may fill in our information incorrectly due to negligence and other reasons, and the check code is to avoid this situation, when generating the ID number, the check code will be automatically calculated, so as to reduce the occurrence of human error.
And the check code is the same as other information, are stipulated by the state, for us, usually fill in their own information when applying for an ID card, and the check code is calculated and generated by the staff according to our information, so when we apply for an ID card, we don't need to care about how the check code is generated, just need to provide the correct information.
In addition, the check code has another function, that is, it can improve the accuracy and security of the information, because the ID card contains a large amount of personal information, if the check code is not established, then the change of a single digit in the information may have an impact on the accuracy of the information.
2. Correct pronunciation.
So how to verify the legitimacy of the number through the check code, or take the 14th to 17th digits of the ID number as an example, assuming that these four digits are A1, A2, A3, A4.
Then when generating numbers, you need to multiply A1, A2, A3, and A4 by the coefficients on the corresponding positions, and then add the product results, and the last digit is unknown.
Therefore, it is necessary to sum the sum of the product of the first 17 digits plus the sum of the product of the last digit, and then perform the remainder operation on 11 of the sum result, and after the remainder operation, the remainder obtained is the value of the check code.
So in addition to 0-9, there is another digit of the check code is "X", but the number of the ID card is eighteen digits, so is the position of the check code in the 18th digit?
Actually, the checksum is not placed in the 18th position, but on the basis of the 18th position, so why is it designed this way?
Because in the mainland's ID number, the first 17 digits of information can represent a lot of information about the person, such as region, date of birth, gender, etc., but for the region, the number of people in each region is different.
For example, in a big city like Beijing, there are many people, so for the area code in the ID number, almost all of them will be used up, but for a sparsely populated area like Tibet, the number of people will be relatively small, so there will be many numbers that are empty.
Therefore, in order to avoid this situation, it is necessary to expand the number in the ID card, but not all regions need to be expanded, so it is necessary to expand differently according to the number of people used in each region.
This will cause the position of the check code to not be the 18th bit, but to expand on this basis, so the position of the check code is not fixed, but the calculation principle of the check code is the same.
So what is the function of the check sum? What is the composition and verification principle of the ID number?
As a kind of identity certificate for mainland citizens, if we correctly read our ID number, then we need to follow the national regulations, that is, the "X" in the number is pronounced as "shí", and the first 17 digits are read according to the pronunciation prescribed by the state.
When applying for an ID card, if you encounter problems such as information leakage caused by the wrong pronunciation of the ID number, it is very serious, so we all need to carry out correct publicity on the pronunciation of the ID number.
So how can you correctly read the information in your ID number?
There are many people who read according to English or habitual pronunciation, so this reading will lead to misunderstanding of the information in the ID number, so we need to read it according to the pronunciation prescribed by the state.