Secure multiway calling

A non-transitory computer readable medium having code stored therein, the code executable by one or more processors to perform operations, and the code comprising:

• code to join a multiway call between a plurality of mobile devices, wherein the joining includes exchanging a first secret used to communicate encrypted traffic of the multiway call between the plurality of mobile devices;
• code to receive an indication associated with a second mobile device of the plurality of mobile devices disconnecting from the multiway call;
• and
• in response to the indication:
• code to discontinue use of the first secret;
• and
• code to establish a second secret with ones of the plurality of mobile devices to continue the multiway call without the second mobile device being able to decrypt traffic of the continued multiway call.

A method comprising:

• establishing, by a first mobile device, a group communication session using a first communication modality;
• during the group communication session using the first communication modality, exchanging one or more keys to support using a second communication modality;
• after the exchanging, determining to use the second communication modality for the group communication session;
• and
• transitioning the group communication session to using the second communication modality, wherein the transitioning includes using the one or more keys to encrypt traffic associated with using the second communication modality.

A first electronic device comprising:

• a memory;
• and
• at least one processor configured to:
• join a multiway call between a plurality of members;
• generate a first secret usable to decrypt traffic communicated by the first electronic device during the multiway call;
• receive, from a second electronic device, a second secret usable to decrypt traffic communicated by the second electronic device during the multiway call;
• and
• sending the first and second secrets to a third electronic device to enable the third electronic device to decrypt traffic communicated by the first and second electronic devices during the multiway call.