Kakao Talk has claimed to have E2E Encrypted chat at least since 2014; it is not on by default. https://www.pcworld.com/article/2856452/kakao-talk-adds-secret-

Kakao Talk has claimed to have E2E Encrypted chat at least since 2014; it is not on by default. https://www.pcworld.com/article/2856452/kakao-talk-adds-secret-chat-feature-amid-privacy-worries.html https://www.pcworld.com/article/2856452/kakao-talk-adds-secr... https://techcrunch.com/2014/12/07/chat-app-kakao-talk-begins-offering-opt-in-encryption-following-recent-privacy-storm/ https://techcrunch.com/2014/12/07/chat-app-kakao-talk-begins...