





Over the last years, we have seen the rise of one algorithm: the double-ratchet algorithm, as the defacto algorithm to be used on secure messaging applications. But, what does it make it so compelling? Why is it very much used? On this talk, we will give an overview of the double-ratchet algorithm, we will describe which privacy and security properties it gives, and we will discuss the reasons of why it is so used. --- Presenter: Sofía Celi (https://twitter.com/claucece) Sofía Celi is a cryptography researcher and implementer at Cloudflare. She also leads the design and implementation of the version 4 of the Off-the-Record messaging protocol. She is very much interested in the intersection of cryptography with real-world issues. https://claucece.github.io --- Bay Area OWASP (https://meetup.com/Bay-Area-OWASP) This meetup is a joint meetup with the Bay Area chapter of the Open Web Application Security Project (OWASP) group which is dedicated to bringing together Bay Area web application security talent and interest in the form of presentations, talks, conferences. --- Cryptography Meetup (https://www.meetup.com/Cryptography-Meetup) The goal of the Cryptography Meetup is to make cryptography more approachable for programmers. If you’re a programmer looking to explore, understand and build systems that use cryptographic algorithms, come learn with us. If you’re a cryptographer come share your knowledge with implementers. We start all our discussions & presentations from the basics, without assuming any prior knowledge of complex mathematics or cryptographic primitives.