Security, trust and confidence can certainly be considered as the most important parts of the Information Society. Being protected when working, learning, shopping or doing any kind of e-commerce is of great value to citizens, students, business people, employees and employers. Commercial companies and their clients want to do business over the Internet in a secure way; business managers when having meetings by videoconferencing tools require the exchanged information to be protected; the publishing industry is concerned with the protection of copyright; hospital patients have a right to...