burnnote is shutting down. What wil you use instead for private messaging?

[ionomy]

Today strong privacy is available to millions of people through end-to-end encryption in Whatsapp, iChat and Facebook Messenger.

Burnnote has been useful for sending secure codes or passwords detached from other identifying content. Once the message is opened, the content vanishes.

What do you use when you need to send secure content like a password?