commissioner. 1  a person authorized to do certain things by a commission or warrant. 2  a member of a commission (sense). 3  an official in charge of a certain government bureau, commission, departmental office, etc.
According to the Social Security Administration, your nine-digit Social Security Number (SSN) is divided into three parts: 1. The first three digits are known as the area number. Until June 25, 2011, this is generally the State or territory where your SSN was assigned. Thereafter, the number was randomly assigned.
The researchers at Carnegie Mellon set out to see if they could discover people's numbers by first exploiting what is publicly known about how the numbers are derived. The Social Security number's first three digits -- called the area number -- is issued according to the Zip code of the mailing address provided in the application form. The fourth and fifth digits -- known as the group number -- transition slowly, and often remain constant over several years for a given region.