Adaptable Security Module State Control
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Solution Overview
Problem
Security modules in electronic systems face challenges in adapting to different generations of user units and connectors, leading to potential security breaches as malicious actors can exploit advanced communication means to access high-value services by mimicking newer decoders and modifying internal memory.
Innovation Solution
A security module with controlled electrical coupling/decoupling means and a state module that manages communication and memory access, using cryptographic operations to ensure only authorized changes and prevent unauthorized access, employing tri-state elements or High Voltage bidirectional MOSFETs to block or unblock communication and memory access based on stored state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the security module includes advanced communication means (e.g., USB 2.0) to support newer decoder generations, then the adaptability and service capabilities are improved, but the vulnerability to security attacks increases due to higher-speed communication channels that can be exploited by malicious third parties
Solution Approach 1:
The security module dynamically controls the activation and deactivation of communication means based on operational state. The status module (ME) manages the electrical coupling/decoupling of communication interfaces, enabling the module to adapt its communication capabilities to different decoder generations while maintaining security by deactivating advanced communication means when not authorized or when potential attacks are detected.
Solution Approach 2:
The status module (ME) acts as an intermediary between the communication means and the rest of the security module. It controls the electrical coupling/decoupling of communication interfaces and manages memory access based on operational state, serving as a security gatekeeper that prevents unauthorized access while allowing legitimate communication.
2Adaptability or versatility
If the security module allows modification of internal memory to support service updates and new functionalities, then the adaptability is improved, but the risk of unauthorized access and malicious modification increases
Solution Approach 1:
The security module dynamically controls memory accessibility based on operational state. The status module (ME) manages electrical coupling/decoupling of memory interfaces, enabling memory to be updated with new services and functionalities while maintaining security by deactivating memory access when not authorized or when potential attacks are detected.
Solution Approach 2:
Different portions of the security module have different access characteristics controlled by the status module. The status module selectively enables or disables access to specific communication means and memory portions based on operational state, creating localized security zones that protect critical data while allowing necessary updates.
3Ease of operation
If the security module maintains compatibility with multiple generations of decoders, then the ease of operation is improved, but the device complexity increases due to support for multiple communication protocols and interfaces
Solution Approach 1:
The security module is designed with multi-functional communication means that can operate in different modes. The status module (ME) manages the electrical coupling/decoupling of communication interfaces, enabling a single module to support multiple decoder generations through different communication protocols while maintaining a unified security architecture.
Data Source
Figure 1~2
AI summary
The aim of the invention is to deliver a security module capable to support different functionalities of a last generation and previous generations without offering a new attack generated by said adaptability. The aim is attained by a security module comprising first means for communicating to a host device, first storage means (MEMO) and first decryption means (ENCO), wherein said security module is characterised in that it comprises a state module (ME), second communication means (COM1) and means (TSB) for physically activating and deactivating said second means, and wherein said activation or deactivation is generated by the state module (ME)