Method for verifying the validity of digital franking notes and device for carrying out said method

摘要

A method for verifying the authenticity of a postage indicium generated using a franking key and applied onto a mailpiece is disclosed. Cryptographic information contained in the postage indicium is decrypted and used for verifying the authenticity of the postage indicium. A data key (KO) is generated, transmitted from a central payment assurance system (ZinS central) to local payment assurance systems (ZinS local) and imported by the latter. A result of the import is transmitted to the central payment assurance system (ZinS central) and once the data key (KO) has been successfully imported into essentially all local payment assurance systems (ZinS local), the data key (KO) is released for the production of new postage indicia.