  Encrypted messaging services like WhatsApp, Facebook Messenger, and Signal
provide secure and deniable communication for billions across the world, but
these exact properties prevent holding users accountable for sending messages
that are abusive, misinformative, or otherwise harmful to society. Previous
works have addressed this concern by allowing a moderator to verify the
identity of a message's sender if a message is reported; if not reported,
messages maintain all security guarantees. Using primitives from threshold
cryptography, this work extends the message-reporting protocol Hecate from
Issa, Alhaddad, and Varia to a setting in which consensus among a group of
moderators is required to reveal and verify the identity of a message's sender.
