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Last week, we saw why SHA256 is certainly the best hashing algorithm that you can use today if you want to securely check the integrity of some data. As explained, SHA256 is preimage resistant: it's virtually impossible to find the original message Message for a given H where H =
WhatsApp just unleashed a new feature, Chat Lock that lets users secure their chats and keep prying eyes out. In this article, we explain how it works as well as how WhatsApp uses end-to-end encryption to secure your chats.