條件接收系統(tǒng)的構(gòu)成

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摘要：在數(shù)字電視傳輸系統(tǒng)中，為了保障授權(quán)用戶收看加密電視節(jié)目，采用了復(fù)雜的條件接收系統(tǒng)。條件接收系統(tǒng)通過多層加密機(jī)制，實(shí)現(xiàn)對(duì)密鑰的分配與管理，文章介紹了信息數(shù)據(jù)加/解擾和加/解密、用戶尋址、智能卡授權(quán)、節(jié)目管理等多項(xiàng)技術(shù)措施，詳細(xì)描述了對(duì)公鑰加密的RSA算法。

關(guān)鍵詞：條件接收系統(tǒng)（CA）；控制字（CW）；業(yè)務(wù)密鑰（SK）；非對(duì)稱加密算法（RSA）

doi：10.3969/J.ISSN.1672-7274.2023.07.017

中圖分類號(hào)：TN 94               文獻(xiàn)標(biāo)志碼：A               文章編碼：1672-7274（2023）07-00-04

Composition of Conditional Access System

LI Ting， LI Yuzhong

（Shandong Radio and Television Station， Jinan 250014， China）

Abstract： In digital television transmission systems， complex conditional access systems are used to ensure that authorized users can watch encrypted television programs. The conditional access system implements the distribution and management of keys through a multi-layer encryption mechanism. This article introduces various technical measures such as encryption/descrambling and encryption/decryption of information data， user addressing， smart card authorization， and program management， and describes in detail the RSA algorithm for public key encryption.

Key words： conditional access system（CA）; control word （CW）; service key （SK）; asymmetric encryption algorithm （RSA）

0   引言

出于安全保密、版權(quán)保護(hù)和商業(yè)利益的需要，有些數(shù)據(jù)的傳輸實(shí)施了加密操作。（剩余3864字）