Encrypted Video Conference Recording With Synchronized Terminal Playback
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Solution Overview
Problem
In video conference systems with end-to-end encryption, the server device cannot combine video conference data from multiple communication terminals, making it difficult to implement a recording function for later reproduction.
Innovation Solution
A communication system with an information processing device that records encrypted communication data from each terminal in a storage unit, transmits encryption keys for decryption, and enables terminals to decode and reproduce the data in synchronization, while maintaining end-to-end encryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If end-to-end encryption is performed in a video conference system, then communication security is improved, but the server device cannot combine video conference data from multiple communication terminals, making recording function difficult to implement
Solution Approach 1:
The patent segments the encryption keys into multiple parts distributed across different communication terminals. Each terminal holds a portion of the key material, and only by combining these segments can the full key be reconstructed to decrypt recorded data. This segmentation allows the server to store encrypted data from multiple terminals while maintaining security, as no single terminal or the server alone possesses the complete decryption capability.
Solution Approach 2:
The patent introduces a key management server as an intermediary that facilitates secure key distribution and management. This server coordinates the complex key sharing process among multiple communication terminals, enabling them to collectively decrypt recorded data without compromising security. The intermediary manages the key material flow and ensures that only authorized terminals can access recorded content.
2Object-affected harmful factors
If end-to-end encryption is implemented, then data leakage from communication terminals is prevented, but the server device cannot process or combine communication data from multiple terminals
Solution Approach 1:
The encryption key material is segmented and distributed across multiple communication terminals rather than concentrated in the server. Each terminal contributes a portion of the key material, allowing the system to maintain encryption security while enabling collective data processing. The server can receive and store encrypted data from all terminals without needing to decrypt or combine it, as the segmented key structure preserves data integrity across terminals.
3Adaptability or versatility
If communication data is encrypted and stored by the server device, then recording function is enabled, but the server device can access and potentially leak the encryption keys
Solution Approach 1:
The encryption key is segmented into multiple parts distributed across different communication terminals. The server device stores encrypted recorded data but does not possess the complete key material, as each terminal holds only a portion of the key. To decrypt and access recorded data, multiple terminals must cooperate to reconstruct the full key, eliminating the server's ability to access or leak the complete key while maintaining recording functionality.
Data Source
AI summary
A communication system includes an information processing device that provides a video conference service; and communication terminals using the service. The information processing device records communication data related to a video conference encrypted and transmitted from each communication terminal in a first storage for the communication terminal; transmits, to the communication terminals, a ciphertext obtained by encrypting an encryption key capable of decoding each item of the communication data recorded in the first storage such that the encryption key can be decoded by the communication terminals; and transmits the communication data recorded in the first storage to the communication terminals. Each communication terminal decodes the communication data for the communication terminal using a decoding result of the ciphertext; and reproduces video and audio included in the communication data decoded for the communication terminal in synchronization with the others based on control data in the communication data.