use of Signal

[robert <http://dummy.us.eu.org/robert>]

After reading
https://www.reddit.com/r/signal/comments/1rr8gse/signal_messages_retrieved_from_iphone_after/ ,
I'm realizing that this is a complicated problem.  If you are in a
group, you have to ensure that everybody in the group has good security
practices.  This may be a limitation of existing messengers in general,
and there may not be a way around it -- not sure.