METHOD FOR CHECKING POSTAGE STAMPS ON LETTERS AND PARCELS

摘要

The invention relates to a method for checking postage stamps on letters and parcels, at a checkpoint . Said checkpoint deciphers the identity and authenticity of a customer system having generated the production of the sta mp by decoding cryptographic security elements originating from a trusted certification point. According to the invention, this method is carried out in such a way that means contained in the checking unit determine a key for whi ch the probability of having been used to encode the data at the certification point is particularly high.