
The social security number in Norway really isn't more than a unique ID. It is printed on every credit card, driver's lisence etc, and you have to give it up everywhere. The actual problem here is that some people actually think it still is a secret. By people I mean certain banks, most of the government etc. The simple solution is to make it public information. A unique static ID for every person in a country is a good thing, a unqiue static password that you can more or less guess isn't. Here is how it is calculated:
The number is 11 digits long, the first six are your birthdate. The last five are the oh so super secret number. The last two of those are nothing more than a checksum thingie, fairly simple calculation done with among other things a modulus 11 operation. There is no problem to that calculation on your own. The first three digits in the oh so secret part are running numbers on the people born on that exact date. The even numbers reserved for girls, the odd numbers reserved for boys. In addition it helps to know what century you are born in, 0-499 are reserved for people born in the 20th century, 500-750 are for people in the 19th century and 500-999 are for people born in the 21th century. (and yes, there is an overlap). So basically you are left with 250 numbers to choose from once you know the birthdate and gender.
Yes, it was a major cock up, but the harm done is really minimal. Perhaps the security now will increase since it can not be regared a secret anymore.
For those that wondered:
1. The norwegian word for password is passord.
2. The tax return lists have usually been published in the local newspaper for all citizens before the internet. The problem that occured when it was first published on the internet is that it was very easy to construct lists of it, thus make databases of it. So now it has been restricted a bit.
3. The CDs had everybody on it, with the exception of children that have not yet paid tax on their own.
4. Where is my coat? Has somebody taken my coat? It had printed my social security number on the back. It is 08..., ah, just ask any newspaper in Norway if you want to know.(or any US official)