A message deciphering method

摘要

A method for decrypting the encrypted messages sent by a transmission device to a first electronic device (SIM) associated with a first trusted authority (TA-SIM) and to a second electronic device (ME). The method comprises the steps of: a) associating a single joint identity with the first (SIM) and the second (ME) devices which is identificative of a common entity comprising the first (SIM) and the second (ME) devices; b) carrying out a single encryption operation of a message by the transmission device, by using the joint identity and transmitting the encrypted message to both devices; c) generating first (WSIM) and second (WME) decryption tokens by the first (SIM) and the second (ME) devices, respectively; d) providing said first token to the second device and said second token to the first device; e) generating, by starting from said tokens, by the first and second devices, of a joint decryption key (W) in order to decrypt the encrypted message.