AMKA Generator (Greece Social Security)
Generate and format valid Greek AMKA social security numbers for software development and QA testing.
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About Greek AMKA (Social Security Number)
AMKA (Arithmos Mitroou Koinonikis Asfalisis - Αριθμός Μητρώου Κοινωνικής Ασφάλισης) is the mandatory work and social insurance identifier for all citizens and workers in Greece.
Composed of 11 decimal digits: the first 6 digits encode the birth date in DDMMYY format, followed by a 4-digit daily sequence and a 1-digit check digit validated by the Luhn algorithm (Modulo 10).
Check Digit Calculation Algorithm (Luhn)
- Extract the first 10 digits of the AMKA.
- Multiply digits in odd positions by 2 (counting right to left).
- If the doubled result is greater than 9, subtract 9 (sum of digits).
- Sum all transformed digits and compute 10-complement: CD = (10 - (Sum % 10)) % 10.