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 TX-type data into TY-type data being carried out using an A-type transformation function, while the transformation of TY-type data into TX-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 (STDA), at least one B-type data processing system (STDB), at least one link, at least once, between the system (STDA) and the system (STDB), at least one A-type processing and memorizing unit (UTMA) including at least the A-type transformation function, at least one B-type processing and memorizing unit (UTMB) including the B-type transformation function and not including the A-type transformation function.