NOTRY: deniable messaging with retroactive avowal

ePrint Report: NOTRY: deniable messaging with retroactive avowal

Faxing Wang

Modern secure messaging protocols typically aim to provide deniability. Achieving this requires that convincing cryptographic transcripts can be forged without the involvement of genuine users. In this work, we observe that parties may wish to revoke deniability and avow a conversation after it has taken place. We propose a new protocol called Not-on-the-Record-Yet (NOTRY) which enables users to prove a prior conversation transcript is genuine. As a key building block …

aim conversation cryptographic deniability eprint report may messaging observe protocols report retroactive secure messaging wang work