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Descrambling device of security element and security element comprising such device

A technology of descrambling and storage, which is applied in the direction of analog confidentiality/charging systems, instruments, electrical components, etc., can solve the problem of high power consumption, and achieve the effect of reducing power consumption and surface area

Inactive Publication Date: 2004-05-12
THOMSON MULTIMEDIA SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] This power consumption figure is high and has many drawbacks
It leads to second-rate reliability of descrambling devices and limits the temperature range of security components that can be used in descrambling devices

Method used

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  • Descrambling device of security element and security element comprising such device
  • Descrambling device of security element and security element comprising such device
  • Descrambling device of security element and security element comprising such device

Examples

Experimental program
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Embodiment Construction

[0032] In all figures, the same reference sign represents the same unit.

[0033] The device of FIG. 1 comprises a shift register 1 and a descrambling circuit 2 which are divided into two zones Z1 and Z2.

[0034] Zone Z1 includes an input terminal EZ1 and an output terminal SZ2, and zone Z2 includes an input terminal EZ2 and an output terminal SZ2. The descrambling circuit 2 comprises an input terminal ED and an output terminal SD. The output terminal SZ1 is connected to the input terminal ED, and the output terminal SD is connected to the input terminal EZ2.

[0035] A signal VE consisting of video data to be descrambled is applied to input EZ1. As mentioned earlier, signal VE is formed from a series of digital data packets or serial bits. The clock CLK clocks how often these bits are accumulated in zone Z1. When N bits have been gathered in zone Z1, N possibly being 64 for example, it is transmitted to the descrambler in the form of a combination C1 of N parallel bits v...

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PUM

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Abstract

In a device for descrambing scrambled digital data arriving at the input of the said device at the bit frequency of a clock signal CLK, the digital data are grouped, before being descrambed, into combinations of n bits at the bit frequency acid into combinations of m x n bits at a frequency equal to the bit frequency diviced by n. The combinations of x n are then descrambled and next split into m combinations of n bits at the bit frequency divided by n and the n bits of each combination are dumped at the bit frequency. The number and surface area of the circuits of the descrambling device working at the bit frequency are thus reduced. This results in a reduction in the power dissipated by the control circuits of the descrambling device. Application to conditional access systems such as smart cards or decoders containing devices for descrambling scrambled digital data.

Description

technical field [0001] The invention relates to a security component allowing the processing of digital data streams. [0002] In particular, the invention relates to a descrambling device included in the above-mentioned security element. Background technique [0003] The security element according to the invention may be, for example, a smart card of a conditional access system, and the digital data may be video data. [0004] As is known to those skilled in the art, conditional access systems enable service providers to provide their services only to those users who are entitled to use those services. For example, in the case of a pay television system. [0005] Items provided by the service provider are items scrambled with control words. Such scrambled items can only be read by the user after descrambling, consistent with the rights assigned to that user. The service provider provides smart cards and decoders to users so that only authorized users can get services. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F5/06G06F21/00H04L9/00H04L9/12H04L9/18H04L9/20H04N7/16
CPCH04L9/00H04N7/163H04L25/03866H04L9/065H04L9/18H04L9/12G06F5/06G06F21/77
Inventor 雅克·普鲁涅尔
Owner THOMSON MULTIMEDIA SA