olemus
turvatud sõnumitega sõnumivahetus
= the communication between two parties in a private and safe manner

näiteid
https://en.wikipedia.org/wiki/Secure_messaging

https://inst.eecs.berkeley.edu/~cs261/fa18/scribe/08_29_third.pdf

https://www.businessnewsdaily.com/6981-secure-messaging-apps-business.html

https://www.mn.uio.no/ifi/english/research/groups/psy/completedmasters/2017/Aulon_Mujaj/aulon_mujaj_msc_comparison_secure_messaging_protocols_implementations_2017.pdf