https://motherboard.vice.com/en_us/article/43bj8w/slack-end-to-end-encryption-shhlack-boss-cant-read-messages

Have you ever worried that your boss may be reading your secret Slack channel where you share cat memes? Or perhaps you don’t trust that high school friend who created a Slack to talk about sports not to read your direct messages?

We’ve got some good news for you. Someone finally made a tool that runs on top of Slack and encrypts messages, making them readable only by the sender and their intended recipient or recipients. The tool, called Shhlack, was created by information security consulting firm MindedSecurity and is available as a browser extension or a patch for the Slack app.