# Confidentiality-Preserving Publish/Subscribe: A Survey

## TL;DR

This survey reviews various methods for ensuring confidentiality in publish/subscribe systems, highlighting challenges and future research directions in secure event dissemination across untrusted environments.

## Contribution

It provides a comprehensive classification and analysis of confidentiality-preserving approaches in pub/sub, covering trust models, access control, and encryption techniques.

## Key findings

- Identifies key challenges in confidentiality for pub/sub systems.
- Summarizes current approaches and their limitations.
- Suggests future research directions for secure pub/sub implementations.

## Abstract

Publish/subscribe (pub/sub) is an attractive communication paradigm for large-scale distributed applications running across multiple administrative domains. Pub/sub allows event-based information dissemination based on constraints on the nature of the data rather than on pre-established communication channels. It is a natural fit for deployment in untrusted environments such as public clouds linking applications across multiple sites. However, pub/sub in untrusted environments lead to major confidentiality concerns stemming from the content-centric nature of the communications. This survey classifies and analyzes different approaches to confidentiality preservation for pub/sub, from applications of trust and access control models to novel encryption techniques. It provides an overview of the current challenges posed by confidentiality concerns and points to future research directions in this promising field.