Method and system for limiting the possibility of transforming data designed to constitute, in particular pre-payment tokens

摘要

The subject of the invention concerns a process and a system to limit the possibility to transform data, the transformation of T_X-type data into T_Y-type data being carried out using an A-type transformation function, while the transformation of T_Y-type data into T_X-type data is carried out using a B-type transformation function, inverse of the A-type transformation function, the data being in particular designed to constitute for instance pre-payment tokens.;According to the invention, the system includes at least one A-type data processing system (STD_A), at least one B-type data processing system (STD_B), at least one link, at least once, between the system (STD_A) and the system (STD_B), at least one A-type processing and memorizing unit (UTM_A) including at least the A-type transformation function, at least one B-type processing and memorizing unit (UTM_B) including the B-type transformation function and not including the A-type transformation function.