The invention concerns data transfer carried out by a communication network. It concerns in particular a method for safe data transfer by a communication network, between a first entity consisting of a chip card and a second entity, which consists in the preliminary production of an electronic signature...http://www.google.com.hk/patents/US6058483?utm_source=gb-gplus-share專利 US6058483 - Method for secure transfer of data by a communication network
