METHOD AND SYSTEM FOR MODIFYING AN AUTHENTICATED AND/OR ENCRYPTED MESSAGE

摘要

A method and system for modifying an authenticated and/or encrypted message by a modifying party exchanged between a sending party and a receiving party based on a secure communication protocol, the method includes the steps of a) dividing a clear message into non-modifiable parts and modifiable parts by the sending party; b) including modifiable part information into the message by the sending party; c) authenticating and/or encrypting the message by the sending party; d) providing en- and decryptability and/or authenticability of the message to the modifying party in such a way that the modifying party can only modify the modifiable parts of the message; e) modifying one or more modifiable parts by the modifying party; and f) providing an authenticated and/or encrypted modified message according to the secure communication protocol to the receiving party.