ge Secret, info="Invoke Message"). 3. The message to the automated chat account, other users’ devices, and if relevant, other participants in the chat is sent using the Signal protocol encryption. The message to the automated chat account contains the Message Secret if this account is a participant of the chat in which the Invocation Message is being sent. Otherwise, it contains the Invoke Message Secret. The message to all other recipients contains the Message Secret. 4. In order to improve the privacy and performance of Invocation Message Responses, they are encrypted with the Invoke Message Secret previously shared with other participants of the chat in the Invocation Message. As the automated chat account generates the response (an initial response or an update to the initial response), it derives a Message Encryption Key from the