A deal in May paid off for the company, which added the encryption upgrade globally about six months after security experts and others began clamoring for it.

The plan, Zoom says, is to integrate Keybase’s personnel to build end-to-end encryption throughout the service. Terms of the deal were not disclosed.

The product rolls out free of charge, but the company's long-term plan to is to make money of enterprise versions of its offerings.

Created by two of the founders of SparkNotes and OkCupid, the service has built some of the most interesting encryption tools on the Internet.