MMT Transmission Encryption Segmentation for Seamless Switching
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Solution Overview
Problem
In MMT transmission systems, seamlessly switching between main and redundant systems during maintenance is challenging due to the need to identify MPU borders within scrambled MMTP packets, requiring descrambling of payload data to analyze the sequence numbers for seamless switching and error identification.
Innovation Solution
The system applies scrambling only to data after the first eight bytes of the MMTP packet, allowing the switching apparatus to read sequence numbers without descrambling, and includes payload length and characteristics in the unscrambled portion for error identification and seamless switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scrambling is applied to the entire payload of MMTP packets to secure confidentiality, then security is improved, but the ability to identify MPU borders for seamless switching deteriorates because the payload cannot be analyzed without descrambling
Solution Approach 1:
The payload of the MMTP packet is segmented into two parts: the first 8 bytes remain unscrambled while the remaining bytes are scrambled. This segmentation allows the switching device to access MPU border identification information without requiring full descrambling, thus maintaining both security and switching capability.
Solution Approach 2:
The critical information needed for switching (MPU border identification via sequence numbers) is extracted from the payload and placed in the first 8 bytes that are excluded from scrambling. This extraction ensures that switching operations can proceed without compromising security of the remaining payload data.
2Reliability
If the entire payload is scrambled to maintain security, then confidentiality is improved, but error identification capability deteriorates because error patterns cannot be detected without descrambling
Solution Approach 1:
The payload is segmented such that the first 8 bytes containing error identification information (parity bits) are excluded from scrambling. This allows the error detection function to operate on unscrambled data while the rest of the payload remains secured through scrambling.
Solution Approach 2:
Error detection information is extracted and placed in the unscrambled portion of the payload. This extraction enables the error detection function to access necessary data without requiring descrambling operations.
3Reliability
If full payload scrambling is applied, then security is improved, but device complexity increases because the switching device must perform descrambling operations to identify MPU borders
Solution Approach 1:
The scrambling operation is segmented to exclude only the first 8 bytes of the payload. This reduces the complexity of the switching device as it no longer needs to implement full descrambling functionality, only needing to read the unscrambled portion for switching decisions.
Solution Approach 2:
The information required for switching operations is extracted and placed in the unscrambled portion of the payload. This extraction eliminates the need for complex descrambling operations in the switching device, thereby reducing device complexity.
Data Source
AI summary
An MMT transmission system includes first and second material output devices, first and second multiplexing devices, first and second encryption processing device, and a switching device. The first encryption processing device encrypts a first payload, except for a first MPU sequence number, of a first MMTP packet included in first multiplexed data output from the first multiplexing device. The second encryption processing device encrypts a second payload, except for a second MPU sequence number, of a second MMTP packet included in second multiplexed data output from the second multiplexing device. The switching device acquires a first MPU boarder from the first MPU sequence number, a second MPU boarder from the second MPU sequence number, and switches transmissions of the multiplexed data at these boarders.