Building A Secure Messenger

Given different people’s and community’s security needs, it’s hard to arrive at a consensus of what a “secure” messenger must provide. In this post, we discuss various options for developers to consider when working towards the goal of improving a messenger’s security. A messenger that’s perfectly secure for every single person is unlikely to exist, but there are still steps that developers can take to work towards that goal. Messengers in the real world reflect a series of compromises by their creators. Technologists often think of those compromises in terms of what encryption algorithms or protocols are chosen. But the choices that undermine security in practice often lie far away from the encryption engine. Encryption is the Easy Part The most basic building block towards a secure messenger is end-to-end encryption. End-to-end encryption means that a messenger must encrypt messages in a way that nobody besides the intended…

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