Adam Hyde wrote:When verbally passing a message you usually need to know your contact persons to know if you can trust them, but you also have to know your technology a little to know if you can trust it. Technologies can leak or distort your message just as humans can. Technologies are invested in types of trust relations: some devices are safer than others, some can be modified, and some are better avoided.

This book tries to address these different layers by giving hands-on explanations on how to make your digital communication and data more secure and by providing the reader with a basic understanding of the concepts of digital communication and data security. It derives from the following principles:

1. No method is entirely secure;
2. You need to have a basic understanding on how and why technology works to make it work for you;
3. You need technology for safer communication: either some basic tools, or more sophisticated equipment, depending on where you're at and where you go.