Table of Contents

 1 Scope            
        1.1 Purpose              
        1.2 Reference architecture    
 2 References   
 3 Definitions   
        3.1 Terms defined elsewhere
        3.2 Terms defined in this Recommendation     
 4 Abbreviations and acronyms  
 5 Conventions
 6 Architectural requirements       
        6.1 CRS headend   
        6.2 CRS STB           
 7 Functional requirements           
        7.1 Authentication and secure download of CACS         
        7.2 CAM and descrambler pairing      
        7.3 Countermeasure to CAM cloning attacks  
 8 Security Requirements              
        8.1 CACS encryption key establishment           
        8.2 Operational encryption key enforcement   
Appendix I – Overall CRS operation flows    
Bibliography