BTW, the news just going around the group chat vulnerabilities in major crypto protocol were public in July 2017 (see my own summary below; which is still valid AFAIK). Good explanation on https://www.wired.com/story/whatsapp-security-flaws-encryption-group-chats/

Seems news outlets need talks (RealWorldCrypto in Swizerland) to notice such things… :)
And authors seem to revised their paper in 2018, too.

@rugk
https://gnusocial.de/notice/10788447 !threema