With end-to-end encryption, only the users chatting with one another will have access to the conversation and its data. WhatsApp won’t have the ability to give over that data if asked by law enforcement officials, as in the case of messages sent via Google’s (GOOG) Gmail and Facebook (FB).

The new feature will be a default setting for WhatsApp’s latest update for Android. An iOS update is expected to be on the way soon, too, according to The Verge.

The company has partnered with WhatsApp “for the past half year,” according to the announcement. It added, “We have a ways to go until all mobile platforms are fully supported, but we are moving quickly towards a world where all WhatsApp users will get end-to-end encryption by default.”

“We’re excited to incorporate what we’ve learned from this integration into our future design decisions, and to bring this experience to bear on integrations that we do with other companies and products in the future,” according to the post.

Open Whisper Systems boasts the mission of making “private communication simple.” It’s powered by Open Source contributors as well as a “small team of dedicated developers.” The company is the developer of TextSecure, an app that “encrypts your text and chat messages” for Android.

Open Whisper Systems says it’s been in the process of developing a “modern, open source, strong encryption protocol” for messaging services over the last three years.

Other encryption apps do exist currently, including Cryptochat, Silent Text and Telegram. The Verge reported that WhatsApp will be the largest to implement this type of security system for messaging applications.

A WhatsApp spokesperson confirmed the partnership via email and said “the company is not commenting beyond the Open Whisper Systems blog post.”

Facebook was not immediately able to be reached for comment.