Cryptographic Adversary Model: Timing and Power Attacks

Abstract

In this work, we present an adversary model that incorporates side chan- nel attacks in the Indistinguishability Experiment for Adaptive Chosen Ciphertext Attack (CCA2).We propose security assumptions and an attack model for a secure SSW-ARQ protocol with an integration of TFTP protocol. We also present the security reduction of SSW-ARQ protocol from Cramer-Shoup encryption scheme, timing and power attacks as side channel security for the SSW-ARQ protocol. We suggest using a lightweight symmetric encryption for data encryption and asymmet- ric encryption for key exchange protocols in the TFTP. The target implementation of secure TFTP is for embedded devices such as Wi-Fi Access Points (AP) and remote Base Stations (BS). In this paper we present the security proofs based on an attack model (IND-CCA2) for securing TFTP protocol. We have also introduce a novel adversary model in IND-CCA2-(TA, PA, TPA) and it is considered a practical model because the model incorporates the timing attack and power attack.