http://y7yea4pmqqtznb33qiugvysyn2bob5v62e4pvoadoibrwkq3tsddjeyd.onion/ps/module/attending-protest
Apple's Messages is end-to-end encrypted, but only if everyone in the chat has an iPhone. Signal is the easiest option to ensure everyone involved in the chat is set up securely by default. In addition to encrypting one-to-one communication, Signal enables encrypted group chats.