Skip to main content
Open Access Publications from the University of California

UC Berkeley

UC Berkeley Previously Published Works bannerUC Berkeley

Obfuscator Synthesis for Privacy and Utility


We consider the problem of synthesizing an obfuscation policy that enforces privacy while preserving utility with formal guarantees. Specifically, we consider plants modeled as finite automata with predefined secret behaviors. A given plant generates event strings for some useful computation, but meanwhile wants to hide its secret behaviors from any outside observer. We formally capture the privacy and utility specifications using the automaton model of the plant. To enforce both specifications, we propose an obfuscation mechanism where an edit function “edits” the plant’s output in a reactive manner. We develop algorithmic procedures that synthesize a correct-by-construction edit function satisfying both privacy and utility specifications. To address the state explosion problem, we encode the synthesis algorithm symbolically using Binary Decision Diagrams. We present EdiSyn, an implementation of our algorithms, along with experimental results demonstrating its performance on illustrative examples. This is the first work, to our knowledge, to successfully synthesize controllers satisfying both privacy and utility requirements.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
For improved accessibility of PDF content, download the file to your device.
Current View