To calculate IBAN checksums, you convert the bank account identifier to a number, take the modulus of 97, and then subtract that from 98. Example: ABNA01234 → 10 11 23 10 0 1 2 3 4 1011231001234 mod 97 = 38 98 - 38 = 60 What is the purpose of that last step?
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Replying to @thijsniks
The purpose is that if you add the check digits, the mod97 of the final IBAN is always 1. (38 + (98 - 38)) mod 97 = 1
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Replying to @dickvanegmond @bslagter
Largest two digit prime number, so lowest chance on hitting a collision where you mistype the number yet get the same checksum
7:50 AM - 1 Jun 2020
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