You must add a |reason= parameter to this Cleanup template – replace it with {{Cleanup|reason=<Fill reason here>}}, or remove the Cleanup template.
64 bit DAA (Data Authentication Algorithm) is based on DES:
O1 = EK(D1)
O2 = EK(O1 D2)
O3 = EK(O2 D3)
… …
ON = EK(ON-1 DN)