Process for protecting an information item transmitted from a security element to a decoder and protection system using such a process

摘要

The invention relates to a process for protecting an information item transmitted from a security element to a decoder. The information item is protected by encrypting within the security element the information item to be transmitted to the decoder and by decrypting this information item within the decoder. The invention applies to conditional-access systems. A security element and a decoder using this process are also disclosed.