Portable device in CA and advanced security implementation of (1)

Summary: CA and advanced security features in portable digital TV launch challenges in the field, this article for this issue a solution and its implementation.

And describes the various based on this scenario, the product application and promotion of the entire industry.

Digital TV full into the portable device market

In recent years digital TV industry has been rapidly developing, in addition to the traditional set-top boxes and integrated machine areas continue to China, now clearly see that digital TV is fully into the portable device market.

TV everywhere concept that seems to have become producers and consumers of consensus. Computer, mobile phone, PMP, GPS ... As long as there is a screen where you can carry out digital television business, with China Mobile Multimedia Broadcasting (CMMB) and terrestrial digital television standard (DTMB) fully under way, the market becomes more intense and compelling.

CA and advanced security brings new challenges

Portable market is a big cake, but also a new position.

Although the public benefit purposes, some programs will be delivered in the form of something, but how in the portable market CA transplantation and commercialization of the development is still a whole industry topics of common interest. Portable device software and hardware environment and set-top box in completely different, on the technical level, we can be divided into two kinds: first, to USB PC interface, as decoding and playback of TV stick forms; and second, to the device in the multimedia application processor chips or (AP) as decoding and playback main forms, mobile phone, PMP, GPS, etc. belong to this category. If the CA is integrated on the PC, is obviously not feasible because the PC is too flexible environment cannot guarantee its security. While the usual USB interface chip is also not very good to finish the work of the CA. Also in mobile phones and PMP, main chip at the beginning of the design did not fully take into account future to CA integration, does not support, some support is not good, and in particular does not meet some of CA manufacturers of advanced security features.

In addition, how to support wireless broadcast security received (such as CMMB safety broadcast), as well as the business of communication security, content copyright protection are now on a new topic will be facing.

Advanced security chip ready

Faced with this situation, we need a connection to the original CA and security systems and portable equipment of the bridge, the bridge is a senior security chip.

As shown in Figure 1, it is a small SOC chip, with CPU, security module, interface, and other functions so as to achieve the following characteristics:

* Supports various CA integration

Chip can run embedded operating system, to support various CA library integration.

Equipped with ISO7816 interface, you can communicate with smart card and key transport. Coupled with a flexible solution for reuse and decryption module, complete the information extraction and programmes can be ordinary decryption, the CA system.

* Have advanced security features

In General, on the basis of the CA system, in order to prevent the CA issues to solve, shared, CA manufacturers usually have made a number of advanced security features.

The design for this chip contains a number of standard hardware encryption engine that supports AES/DES/3DES/MULT2/SMS4 and various encryption standard and derived algorithm. At the same time as the comprehensive safety interface and access road design, including security JTAG, safe boot, critical data-capture and other means to ensure that the CA system is unbreakable.

* Flexible interface

For the portable market a wide range of products and applications, a variety of interfaces is essential.

On the one hand, supports a variety of channel modem access, on the other hand will descramble content output to a variety of terminals, including computers, mobile phone, MP4, GPS, etc.

* Low-power, low cost

In previous increase in portable devices digital TV module, how to reduce overall power consumption and cost are all eager to solve problems.

In the security chip, with advanced multistage clock gating, frequency dynamic adjustment, Super hibernation techniques, dynamic power and standby power consumption is reduced to a lower level; at the same time tried to control the size and package size, the total cost increase is limited.

Figure 1: advanced security chips overall chart.

Comprehensive power industry development

With such a chip, we encounter in the portable market, many problems can be resolved, the application of various differences are clearly visible.

The following will apply to the various possible ways to describe:

* Multiformat USB PC TV

Portable or normal desktop PC, with powerful decoding capability and larger screen, enables high-definition playback, video recording and other high-end application, is an excellent platform for watching TV.

CMMB or DTMB wireless receiver is the perfect notebook. For CMMB CA system, Nagravision or as Bo, this novel-a security chip can easily integrate and perfect support, but is less costly or more of the SMD chip packaging. With chip standard interface, you can even make up a CMMB and DTMB dual TV stick, two standard signal and the programme complement, to resolve the current program source and signal coverage.

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