WhatsUpp with Sender Keys? Analysis, Improvements and Security Proofs

ePrint Report: WhatsUpp with Sender Keys? Analysis, Improvements and Security Proofs

David Balbás, Daniel Collins, Phillip Gajland

Developing end-to-end encrypted instant messaging solutions for group conversations is an ongoing challenge that has garnered significant attention from practitioners and the cryptographic community alike. Notably, industry-leading messaging apps such as WhatsApp and Signal Messenger have adopted the Sender Keys protocol, where each group member shares their own symmetric encryption key with others. Despite its widespread adoption, Sender Keys has never been formally …

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