Double ratchet rotates message keys after each message, so previous consecutive messages from the same author become undecryptable, when the previous message key is discarded after decryption. It's a small difference, but it's good for disappearing messages.
It could also be used in a 1-on-1 chat. Does it essentially become a "normal" double ratchet in that degenerate case? @JeffG
View quoted note →
