Session Key Recovery for Encrypted Content History Access
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Solution Overview
Problem
End-to-end encryption services currently do not support secure content history recovery for new or offline members joining an encrypted session, creating vulnerabilities and preventing access to previously exchanged encrypted content.
Innovation Solution
A system that securely provides session keys and metadata for decrypting encrypted content history to authorized members, ensuring encryption throughout the content history recovery process, using recovery messages separate from the encrypted content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If end-to-end encryption is implemented to secure data exchange, then security and privacy are improved, but content history recovery for new or offline members becomes impossible
Solution Approach 1:
The system segments the content delivery process into two separate components: encrypted content history delivery and session key delivery. Each component is transmitted through different channels and processed independently, allowing new members to receive both the encrypted content and the corresponding decryption keys without compromising the security of ongoing communications.
Solution Approach 2:
The system introduces an intermediary key management mechanism that facilitates secure key distribution to new members without requiring them to be present during the original key exchange. This intermediary process enables offline members to recover content history while maintaining end-to-end encryption for active participants.
2Adaptability or versatility
If content history is stored and transferred without encryption to new members, then content history recovery is enabled, but security vulnerabilities are created
Solution Approach 1:
The system separates encrypted content history from decryption keys, transmitting both through secure channels. This segmentation ensures that neither component alone can compromise security, while together they enable content history recovery for authorized members.
Solution Approach 2:
The system changes the encryption parameters dynamically, using different encryption schemes for content history versus active communications. This allows content history to be accessible to new members while maintaining strong encryption for ongoing secure communications.
3Reliability
If session keys are securely exchanged between parties, then encryption security is maintained, but new members cannot receive keys for decrypting previous content
Solution Approach 1:
The system performs preliminary key preparation and storage in a secure key management infrastructure before new members join. This preliminary action enables rapid and secure key distribution to new members without requiring them to miss any communication content, while maintaining the security of the original key exchange between active participants.
Solution Approach 2:
The system introduces a key management intermediary that bridges the gap between secure key exchange and new member access. This intermediary securely retrieves, manages, and distributes appropriate keys to new members without compromising the security of the original communication channel or requiring re-keying of active participants.
Data Source
AI summary
An end-to-end encrypted communication system securely provides session keys for encrypted session history recovery for new members or reconnecting members of an encrypted session. The encrypted session history recovery adapts the end-to-end encryption for secure distribution of the encrypted content and session keys that were exchanged before the members connected to the encrypted session. The system receives encrypted content from a first member of the encrypted session during a first time when the first member is online and a second member of the encrypted session is offline and not connected to the encrypted session. The system detects that the second member comes online and connects to the encrypted session at a second time, and provides the second member with a session key associated with decrypting the encrypted content that was exchanged prior to the second member connecting to the encrypted session.