SYSTEM FOR PROVIDING RE-EFFECTIVE SERVICE

摘要

The system comprises memory cards and card readers. The card memories (MEM) include validation memory points Vj and credit memory points Ci,j. The addresses of the validation points Vj and the addresses of the associated credit point Ci,j are defined by a reference table (TRR) and a permutation table (TP) which make use of a data item (ZF) which is specific to the card.