Strong Converse Theorem for Source Encryption under Side-Channel Attacks

We pose and investigate the security problem of a source encryption using common key under the side channel attacks. This cryptosystem includes the secrecy problem for encrypted sources under the side channel attacks, which was previously studied by Santoso and Oohama. In this paper we propose a new security criterion based on the mutual information between the plaintext and the ciphertext. Under this criterion, we establish the necessary and sufficient condition for the secure transmission of correlated sources.