Downloadable and replaceable condition receiving system

Abstract

The invention provides a downloadable and replaceable condition receiving system which comprises a safety data management platform, a transmitting end and a receiving end, wherein the transmitting end comprises a transmitting end root key generating module, and is used for receiving a first intermediate key SCKv transmitted by the safety data management platform and a second intermediate key Seedv provided by a chip manufacturer, and generating a root key according to a root key deriving mechanism provided by the chip manufacturer, the SCKv and the Seedv; the receiving end comprises an OTP (one time programmable) region and a receiving end root key generating module, the OTP region is used for reducing a safety key SCK according to an ESCK reducing mechanism written on the OTP region in a burning manner and provided by the chip manufacturer, and an encryption safety key ESCK and a chip identifier Chip IF provided by the safety data management platform when a system is electrified, and transmitting the safety key SCK to the receiving end root key generating module; and the receiving end root key generating module is used for generating the root key according to a preset mechanism, a chip mask key SMK provided by the chip manufacturer, the SCK, and a derived identifier Vendor-Sys ID provided with a condition receiving manufacturer.

Description

technical field [0001] The present invention relates to a conditional access system, in particular to a downloadable and replaceable conditional access system. Background technique [0002] The conditional access system is the basis of digital TV operation fee management, and the premise and guarantee for the long-term stable development of the operator's business. The conditional access system CAS includes: user management system SMS, service information generation system SIG, program management and editing system PMS / SI, program scheduling processing system EIS, user authorization management system SAS, conditional access CA, etc. It mainly includes two parts: one is SMS for managing users, and the other is CA for managing programs. CA is mainly divided into two parts: one is the signal scrambling part, which controls the scrambling of the signal by the scrambler through a random code (called the control word CW) generated by a random code generator; the other is the encr...

AI Technical Summary

Problems solved by technology

[0004] The problem with existing conditional access systems is that, first of all, since the root key is generated by the conditional access manufacturer and the same root key is pre-embedded at the receiving end as the sending end, the root key is easily cracked. Conditional access system is less secure

Secondly, since the root key of a specific conditional access manufacturer is pre-embedded in hardware devices such as security chips or smart cards at the receiving end, if the operator changes the conditional access manufacturer, the receiving end hardware with the pre-embedded key must be replaced. lead to a waste of resources and an increase in costs

In addition, the client software of the conditional access vendor at the receiving end is pre-installed at the receiving end together with the root key, which is used to decrypt and descramble the transmitted security information. Different CA vendors have different client software, and the same CA vendor It is also possible to update its client software. When the CA vendor is replaced or the CA vendor updates its client software, the receiving end cannot replace the client software but can only replace the receiving end hardware, which will also cause waste of resources and costs. increase

Images