1. INTRODUCTION  
1.1. Pub/sub paradigms  
1.2. Pub/sub confidentiality  
1.3. Survey motivation  
1.4. Organization  

2. CONFIDENTIALITY IN THE CONTEXT OF PUB/SUB  
2.1. System model  
2.2. Threat models  
2.3. Motivating example: extended e-Health infrastructure  
2.4. Pub/sub confidentiality properties  
2.5. The two lines of research on pub/sub confidentiality  

3. CONFIDENTIALITY IN PUB/SUB SECURITY MODELS  
3.1. Generic broker-based pub/sub systems  
3.2. Pub/sub privacy for ubiquitous computing  
3.3. Limitations of surveyed security models  

4. CONFIDENTIALITY THROUGH ENCRYPTED MATCHING  
4.1. General properties of encrypted matching schemes  

5. CHALLENGES AND UNEXPLORED ISSUES  
5.1. Key management  
5.2. Confidentiality, performance and functional limitations  
5.3. Attack model limitations and other security aspects  
5.4. Toward security models with encrypted matching