Personal identification number (Denmark)
Encyclopedia
The Danish
Personal Identification number ( or ) is a national identification number
, which is part of the personal information stored in the Civil Registration System
(Danish: Det Centrale Personregister).
The register was established in 1968 by combining information from all municipal civil registers of Denmark into one.
It is a ten-digit number with the format DDMMYY-SSSS, where DDMMYY is the date of birth and SSSS is a sequence number. The first digit of the sequence number encodes the century of birth (so that centenarians are distinguished from infants), and the last digit of the sequence number is odd for males and even for females.
) or later in a Danish civil register, receives a personal identification number. Any person who is a member of ATP
or is required to pay tax in Denmark according to the Tax-control Law of Denmark, but is not registered in a civil register, also receives a personal identification number.
The civil register list only persons who:
Danish citizens, including newborn babies, who are entitled to Danish citizenship
, but are living abroad, do not receive a personal ID number, unless they move to Denmark.
for the entire personal identification number.
In this case, the number satisfies the equation 4x1 + 3x2 + 2x3 + 7x4 + 6x5 + 5x6 + 4x7 + 3x8 + 2x9 + x10 ≡ 0 (mod
11) where the xi are the ten digits of the complete ID number, and the coefficients (4, 3, 2, 7, …) are all nonzero in the finite field
of order 11
.
However in 2007 the available sequence numbers under this system for males born on 1 January 1965 ran out, and since October 2007 personal identification numbers do not always validate using the check digit. This had been predicted and announced several years in advance. Thus, most IT systems are presumed updated to accept numbers that fail the check-digit validation.
1 January was the first birth date to run out of sequence numbers because immigrants who do not know their exact date of birth are administratively registered with the fictitious birth date of 1 January. This made the date unusually frequent in the register.
It is received upon registration with the Civil Registration System, either by birth or by moving to the country. It may only be issued once and change of address does not entail issuing a new one. One can however request a new one from the Ministry of Welfare or in some cases the municipality one lives in.
Denmark
Denmark is a Scandinavian country in Northern Europe. The countries of Denmark and Greenland, as well as the Faroe Islands, constitute the Kingdom of Denmark . It is the southernmost of the Nordic countries, southwest of Sweden and south of Norway, and bordered to the south by Germany. Denmark...
Personal Identification number ( or ) is a national identification number
National identification number
A national identification number, national identity number, or national insurance number is used by the governments of many countries as a means of tracking their citizens, permanent residents, and temporary residents for the purposes of work, taxation, government benefits, health care, and other...
, which is part of the personal information stored in the Civil Registration System
Det Centrale Personregister
Det Centrale Personregister , short CPR is a Danish nationwide centralised register of personal information.Established in 1968, the register contains information concerning the name, address, Danish personal identification number, date and place of birth, citizenship and other associated information...
(Danish: Det Centrale Personregister).
The register was established in 1968 by combining information from all municipal civil registers of Denmark into one.
It is a ten-digit number with the format DDMMYY-SSSS, where DDMMYY is the date of birth and SSSS is a sequence number. The first digit of the sequence number encodes the century of birth (so that centenarians are distinguished from infants), and the last digit of the sequence number is odd for males and even for females.
Requisition
Any person registered as of 2 April 1968 (1 May 1972 in GreenlandGreenland
Greenland is an autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for...
) or later in a Danish civil register, receives a personal identification number. Any person who is a member of ATP
Arbejdsmarkedets Tillægspension
Arbejdsmarkedets Tillægspension is a supplementary pension in Denmark, and is Denmark's largest lifelong pension plan. Citizens of Denmark become eligible for ATP payments as soon as they turn 65 years old. Arbejdsmarkedets Tillægspension was amended into law on March 7, 1964.-See...
or is required to pay tax in Denmark according to the Tax-control Law of Denmark, but is not registered in a civil register, also receives a personal identification number.
The civil register list only persons who:
- Are born in Denmark of a mother already registered in the civil register, or
- Have their birth or baptism registered in a ’Dansk Elektronisk Kirkebog (DNK)’ (Danish electronic church-book), or
- Reside legally in Denmark for 3 months or more (non-NordicNordic countriesThe Nordic countries make up a region in Northern Europe and the North Atlantic which consists of Denmark, Finland, Iceland, Norway and Sweden and their associated territories, the Faroe Islands, Greenland and Åland...
citizens must also have a residence permit)
Danish citizens, including newborn babies, who are entitled to Danish citizenship
Citizenship
Citizenship is the state of being a citizen of a particular social, political, national, or human resource community. Citizenship status, under social contract theory, carries with it both rights and responsibilities...
, but are living abroad, do not receive a personal ID number, unless they move to Denmark.
New development in 2007
The sequence numbers used to be chosen (and still are, preferentially) so that the last digit of the sequence number functions as a check digitCheck digit
A check digit is a form of redundancy check used for error detection, the decimal equivalent of a binary checksum. It consists of a single digit computed from the other digits in the message....
for the entire personal identification number.
In this case, the number satisfies the equation 4x1 + 3x2 + 2x3 + 7x4 + 6x5 + 5x6 + 4x7 + 3x8 + 2x9 + x10 ≡ 0 (mod
Modular arithmetic
In mathematics, modular arithmetic is a system of arithmetic for integers, where numbers "wrap around" after they reach a certain value—the modulus....
11) where the xi are the ten digits of the complete ID number, and the coefficients (4, 3, 2, 7, …) are all nonzero in the finite field
Finite field
In abstract algebra, a finite field or Galois field is a field that contains a finite number of elements. Finite fields are important in number theory, algebraic geometry, Galois theory, cryptography, and coding theory...
of order 11
11 (number)
11 is the natural number following 10 and preceding 12.Eleven is the first number which cannot be counted with a human's eight fingers and two thumbs additively. In English, it is the smallest positive integer requiring three syllables and the largest prime number with a single-morpheme name...
.
However in 2007 the available sequence numbers under this system for males born on 1 January 1965 ran out, and since October 2007 personal identification numbers do not always validate using the check digit. This had been predicted and announced several years in advance. Thus, most IT systems are presumed updated to accept numbers that fail the check-digit validation.
1 January was the first birth date to run out of sequence numbers because immigrants who do not know their exact date of birth are administratively registered with the fictitious birth date of 1 January. This made the date unusually frequent in the register.
Personal ID Number Certificate
Personnummerbevis is the Danish term for the personal identification number certificate. Today this certificate is of little use in Danish society, as it has been largely replaced by the much more versatile Sygesikringsbevis, which contains the same information and more. Both certificates retrieve their information from the Civil Registration System. However, personnummerbevis is still issued today and has been since September 1968.It is received upon registration with the Civil Registration System, either by birth or by moving to the country. It may only be issued once and change of address does not entail issuing a new one. One can however request a new one from the Ministry of Welfare or in some cases the municipality one lives in.