This paper presents an overview of the current and next solutions for privacy protection on the Internet. We highlight five categories of Privacy Enhancing Technologies (PETS). First, we introduce the multiple virtual identities that can represent a person, and the way the person can manage them. Then, we focus on the untraceability problem, which has been a major field of research since the ve...

utbreaks of severe acute respiratory syndrome (SARS) have resulted in increased discussion about community-based infection control measures, including voluntary quarantine. In the 2003 SARS outbreak in Toronto, Canada, at least 23,000 persons participated in voluntary quarantine in their homes because of possible exposure (1). Quarantined persons were told to remain at home, not allow anyone to...