Multimedia Unit Pairing via Cryptographic Key Derivation
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Solution Overview
Problem
Current conditional access systems face challenges in securely pairing multimedia units with operators, particularly in broadcast transmission environments, where massive data quantities are required for key distribution, leading to inefficiencies and security risks, including the potential for stolen units to be used by multiple operators and delayed activation of multimedia units.
Innovation Solution
A method where multimedia units and operators use secure cryptographic functions to derive unique pairing keys from a personalization key and identifiers, allowing for remote personalization and secure attribution of keys without exposing sensitive information, enabling secure communication and independent key management for each operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional key distribution methods are used to pair multimedia units with operators, then security can be maintained, but massive data quantities are required for key distribution, leading to inefficiencies and security risks
Solution Approach 1:
The patent extracts only the essential identifier information from multimedia units and transmits it to operators, rather than distributing complete key sets. This extraction approach reduces data transmission volume while maintaining security through cryptographic verification of the transmitted identifiers.
Solution Approach 2:
The patent segments the key distribution process into two parts: (1) transmission of compact identifier data from multimedia unit to operator, and (2) local generation of cryptographic keys by the operator using received identifiers. This segmentation eliminates the need to transmit large volumes of key material while preserving security.
2Productivity
If multimedia units are pre-personalized with operator-specific data during production, then pairing can be done quickly, but stolen units can be used by multiple operators and activation is delayed
Solution Approach 1:
The patent enables operators to autonomously personalize multimedia units by having them transmit their identifiers to the operator, who then locally generates the appropriate cryptographic keys. This self-service approach eliminates activation delays and ensures operator exclusivity since each operator independently configures their own units without requiring pre-personalization that could be stolen.
3Reliability
If operator-specific secret data is provided to manufacturers for personalization, then secure pairing can be achieved, but the quantity of data to be transmitted is huge
Solution Approach 1:
The patent extracts only the essential identifier information from multimedia units and transmits it to operators, rather than distributing complete key sets. This extraction approach reduces data transmission volume while maintaining security through cryptographic verification of the transmitted identifiers.
Solution Approach 2:
The patent uses cryptographic hash functions as intermediaries to transform multimedia unit identifiers into secure key material. This intermediary process allows operators to generate secure keys locally from compact identifier data, eliminating the need to transmit large volumes of secret personalization data to manufacturers.
Data Source
AI summary
The present invention relates in particular to a pairing method between a multimedia unit and one operator having an operator identifier, the multimedia unit having a multimedia unit identifier and receiving conditional access data from said operator, the method being characterized in that:receiving by the multimedia unit a multimedia unit key formed by applying a first cryptographically function to a personalization key and to the multimedia unit identifier;receiving by the operator an operator key formed by applying a second cryptographically function to said personalization key and to the operator identifier;said multimedia unit further having a function of the multimedia unit and said operator further having a function of the operator, these functions being such that the result of the application of the function of the operator to said operator key and to said multimedia unit identifier is equal to the result of the application of the function of the multimedia unit to said multimedia unit key and to said operator identifier, this result forming a pairing key between said multimedia unit and said operator.