After experiencing childhood in Soviet Ukraine in the 1980s, Jan Koum, founder of Whatsapp figured out how to mistrust the government and despise its reconnaissance. After he moved to the United States and made ultra-popular messaging framework decades later, he pledged that Whatsapp would never make snooping simple for anybody. Presently, Whatsapp is following through on that anti-snooping pledge at a phenomenal scale.

Whatsapp reported on Tuesday that it’s incorporating end-to-end encryption, a move up to its privacy assurances that makes it almost unthinkable for anybody to peruse clients’ messages—even the organization itself. Whatsapp will incorporate the open-source programming Textsecure, made by security concentrated non-profit Open Whisper Systems, which scrambles messages with a cryptographic key that just the client can get to and never leaves his or her gadget. The result is for all intents and purpose un-crackable encryption for countless phones and tablets that have Whatsapp installed — by a few measures the world’s biggest ever implementation of this standard of encryption in a messaging service.

Moxie Marlinspike, Open Whisper System’s inventor and a well known software developer in the cryptography group said, “Whatsapp is incorporating Textsecure into the most prominent messaging application on the planet, where folks exchange billions of messages a day. I believe this is the biggest end-to-end encryption deployment ever.”

Textsecure has already been silently encrypting Whatsapp messages between Android gadgets for a week. The new encryption plan implies Whatsapp messages will now fly out the distance to the beneficiaries’ gadget before being decrypted, instead of simply being encoded between the client’s gadget and Whatsapp’s server. The change is almost undetectable, however Marlinspike says Whatsapp will soon add a peculiarity to permit clients to check each others’ identities on the basis of their cryptographic key, a resistance against man-in-the-center attacks that interrupt conversations. Marlinspike said, “Regular clients won’t spot the difference. It’s completely frictionless.”

In its beginning stage, however, Whatsapp’s messaging encryption is constrained to Android, and doesn’t yet apply to group messages, images or video messages. Marlinspike says that Whatsapp intends to expand its Textsecure rollout into other gimmicks and other platforms, including Apple’s iOS, soon. He wouldn’t point out a particular time period, and Whatsapp staff members declined to remark on the new encryption characteristics. Marlinspike says, the Textsecure execution has been in the works for 6 months, since soon after Whatsapp was acquired by Facebook last February.

So, for now, just Whatsapp’s Android users alone symbolize a huge new client base for end-to-end encrypted messages: Whatsapp’s page in the Google Play store records more than 500 million downloads. Formerly, Textsecure had been installed on just around 10 million devices running the Cyanogen mod variant of Android and around 500,000 different gadgets.

The only encrypted messaging framework that analyzes in size is Apple’s iMessage, which likewise claims of using a rendition of end-to-end encryption. As compared to Textsecure, nonetheless, Apple’s iMessage security has a few genuine weaknesses. iMessage doesn’t track which gadgets’ cryptographic keys are connected with a certain client, so Apple could basically make another key the client wasn’t known of to begin interrupting his or her messages. Also, numerous clients innocently back up their stored iMessages to Apple’s iCloud, which renders any end-to-end encryption debatable. Furthermore, dissimilar to Textsecure, iMessage doesn’t utilize an element known as “forward secrecy” that makes a new encryption key for each message sent. This implies that any individual who gathers a client’s encoded messages and effectively breaks a client’s key can unscramble all their conversations, not only the one message that uses that key.

Whatsapp’s rollout of such solid encryption to countless clients may be a disliked move among governments around the globe, whose scrutiny it could make significantly more troublesome. No doubt, Whatsapp’s client base is global, with extensive populaces of clients in Europe and India. In any case Whatsapp organizer Jan Koum has been vocal about his resistance to chipping in with government snooping. “I grew up in a society where all that you did was snooping on, recorded, squealed on,” he told Wired UK recently. “No one ought to have the right to listen snoop, or you turn into a totalitarian state — the sort of state I fled as a kid to come to this country where you have democracy and opportunity of discourse. Our objective is to secure it.”