Information Leakage
The last digits of an EGN can reveal with reasonable accuracy the birthplace of a Bulgarian citizen, because of the long-lasting practice of assigning numbered sheets of paper to municipal ESGRAON divisions. Other divisions directly add the birth sequence number to the last 3 digits of their EKNM (a regional identifier) and possibly another 1 depending on the baby's sex. This practice is denied by ESGRAON officers, but is nevertheless used by civil authorities as a rule of thumb for checking the validity of an identity document.
Read more about this topic: Uniform Civil Number
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