This is the hitchhiker’s guide to cipher in devs. More than ever, we need security in our web services and our apps, just to be confident about our data and privacy. As a developer, it’s your responsibility. Maybe you think it’s too complicated for you. Maybe you think it’s just a hobby for crypto-hackers. You probably just suffer a lack of information about how cryptography works, and what kind of tools you can use. So, dive into the cryptographic world: ciphers, techniques, tools, etc. We will take a look at which solution to use according to the context. Because Open Source matters in terms of privacy, we will see both huge and tiny frameworks about security and ciphers. We will also see what cryptography in the browser means with the W3C’s WebCrypto API, the frameworks build on it, and how to use them for a better security layer in our web and mobile apps.