[자료] 카카오톡 E2E, PFS

http://likelink.co.kr/34478

쉽게 잘~ 풀어쓴 글

* OTR

http://en.wikipedia.org/wiki/Off-the-Record_Messaging

* Certificate pinning

http://en.wikipedia.org/wiki/Transport_Layer_Security#Certificate_pinning

http://yellowbirds.tistory.com/archive/201110?page=3