Transport Stream Encryption for Digital TV Security
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Solution Overview
Problem
Current digital television transmission methods, such as CA on-chip integration and CA separation solutions, are incompatible across different operators and leave transport streams (TS) vulnerable to unauthorized copying and key cracking due to the transmission of transparent, unprotected TS between devices.
Innovation Solution
A secure transmission method and apparatus where a first device in a digital television receiving terminal encrypts the TS using a negotiated key and encryption algorithm, and a second device decrypts it using a corresponding decryption algorithm, ensuring the TS remains encrypted and secure throughout the transmission process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CA separation solution is used to improve compatibility across different operators, then adaptability is improved, but security of TS transmission deteriorates because TS is transmitted in transparent and unprotected form
Solution Approach 1:
The patent introduces an encryption intermediary layer between the CA card and video decoding chip. The TS is encrypted using a negotiated key and transmission encryption algorithm before being transmitted through the CA separation interface, and decrypted by the receiving end. This intermediary encryption mechanism allows the system to maintain CA separation for operator compatibility while adding security protection during TS transmission.
Solution Approach 2:
The patent changes the state of TS from transparent to encrypted by modifying the encryption parameter. A transmission encryption algorithm and negotiated key are applied to transform the TS into an encrypted form during transmission, and then restored to transparent form after decryption at the receiving end, enabling both compatibility and security.
2Object-affected harmful factors
If CA on-chip integration solution is used to ensure TS security, then security is improved, but adaptability to different operators deteriorates
Solution Approach 1:
The patent segments the CA function from the video decoding function, separating them into independent modules (CA card and video decoding chip). This segmentation allows each module to operate independently with different encryption algorithms and keys suited for different operators, resolving the compatibility issue while maintaining security through the introduced transmission encryption layer.
Solution Approach 2:
The patent introduces dynamic key negotiation and algorithm selection mechanisms. The encryption key and algorithm are negotiated between devices based on their capabilities and the specific operator requirements, making the system adaptable to different operators while maintaining security. This dynamic approach replaces the static, operator-specific CA on-chip integration.
3Ease of operation
If transparent TS transmission is used to simplify the transmission process, then ease of operation is improved, but security deteriorates due to vulnerability to copying and key cracking
Solution Approach 1:
The patent extracts the security function from the transmission process by introducing a separate encryption/decryption layer. The TS transmission process itself remains simple and transparent, but a security layer is taken out and applied independently through key negotiation and encryption algorithm application, maintaining operational simplicity while adding security protection against copying and key cracking.
Data Source
AI summary
Provided are a secure transmission method and apparatus for transport stream (TS). The method is applied to a receiving terminal of a digital television broadcasting system, comprising: after receiving a TS, a first device in the receiving terminal encrypts the received TS using a key already negotiated with a second device in the receiving terminal and utilizing a determined encryption algorithm, and sends the encrypted TS to the second device in the receiving terminal; after receiving the encrypted TS, the second device in the receiving terminal decrypts the received encrypted TS using the key and utilizing a decryption algorithm corresponding to the encryption algorithm. Using the present invention can protect the security of the TS transmission.