Patent ID: 8458468

Claim:
A method for enabling at least one receiving user to access a protected information item sent by a sending user through a communication network, the possibility of accessing said protected information item depending on the availability to said at least one receiving user of sensitive data sent by said sending user in encrypted form, said encrypted form derived from a first encryption/decryption mechanism, the method comprising: providing each of said at least one receiving user with a SIM module-having stored thereon a second encryption/decryption mechanism, wherein the second encryption/decryption mechanism comprises a SIM identifier that is unique to a respective one of said at least one receiving user and functionally identical to said first encryption/decryption mechanism, wherein said sensitive data comprises cryptographic parameters comprising two session keys and a digital certificate, the session keys and digital certificate encrypted together via a random encryption key computed as a function of the two session keys associated with the SIM module; and decrypting said sensitive data at said at least one receiving user exploiting said second encryption/decryption mechanism.