Raúl Siles es fundador y analista de seguridad de DinoSec. Durante más de una década ha aplicado su experiencia en la realización de servicios técnicos avanzados de seguridad e innovado soluciones ofensivas y defensivas para organizaciones internacionales de diferentes industrias. Raúl es ponente habitual en conferencias y eventos de seguridad internacionales e instructor certificado del SANS Institute. Raúl es uno de los pocos profesionales a nivel mundial que ha obtenido la certificación GIAC Security Expert (GSE). Más información en http://www.raulsiles.com (@raulsiles) y http://www.dinosec.com (@dinosec). WhatsApp finally implemented end to end (E2E) encryption less than a year ago. This talk will perform an overall review and in-depth look at the technologies involved in that implementation, and more specifically, the Signal protocol. The Signal cryptographic protocol is becoming the de-facto standard and widely adopted reference for secure (instant) messaging solutions, such as WhatsApp, Signal (TextSecure), Google Allo, Facebook Messenger, etc. The goal of the talk is to explain the history, evolution, design, security properties and features, technical aspects, numerous keys and cryptographic components of this complex modern protocol, plus other associated algorithms and protocols, trying to facilitate its understanding to non-cryptographers... ;o)