Data is an important resource of the 21st century. This presents software developers with the challenge of making applications more secure during development. However, end users can also do a lot to protect their data from unauthorized access. How can I communicate confidentially? What should I do if a service provider has been hacked? How can I minimize risks? This book shows how users can navigate the connected world without sacrificing privacy protection or revealing trade secrets. It conveys the essential technical concepts that can be used to protect confidential data. Readers will acquire the necessary know-how through this book—specialized knowledge is not required. The first part introduces the key algorithms that software developers can use to encrypt data. Fundamental.