If you’ve ever scrolled through the Guardian homepage, you may have come across the ‘Contact the Guardian securely’ banner. This links to a page explaining how to share sensitive information with the Guardian in a number of different ways. Of these, the one that offers the best security is SecureDrop.SecureDrop is a system developed by the Freedom of the Press Foundation to enable sources to contact media organisations anonymously. It is a system widely respected and deployed in a large number o...