## Cryptology ePrint Archive: Report 2014/384

Yao's millionaires' problem and decoy-based public key encryption by classical physics

Abstract: We use various laws of classical physics to offer several solutions of Yao's millionaires' problem without using any one-way functions. We also describe several informationally secure public key encryption protocols, i.e., protocols secure against passive computationally unbounded adversary. This introduces a new paradigm of decoy-based cryptography, as opposed to traditional" complexity-based cryptography. In particular, our protocols do not employ any one-way functions.

Category / Keywords: cryptographic protocols / Yao's millionaires' problem, decoy-based cryptography, computationally unbounded adversary