Compact Key Storage: A Modern Approach to Key Backup and Delegation

ePrint Report: Compact Key Storage: A Modern Approach to Key Backup and Delegation

Yevgeniy Dodis, Daniel Jost, Antonio Marcedone

End-to-End (E2E) encrypted messaging, which prevents even the service provider from learning communication contents, is gaining popularity. Since users care about maintaining access to their data even if their devices are lost or broken or just replaced, these systems are often paired with cloud backup solutions: Typically, the user will encrypt their messages with a fixed key, and upload the ciphertexts …

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