Li Yang, Chong Xiang, Bao Li
We present a quantum probabilistic encryption algorithm of private-key encryption scheme based on conjugate coding of qubit-string. Usually, probabilistic encryption algorithm is adopted in public-key encryption protocols. Here we consider its function of increasing the unicity distance of both classical and quantum private-key encryption scheme. The security of quantum probabilistic private-key encryption against two kinds of attacks is analyzed. Based on no-signalling postulate we show that the scheme can resist the attack to the key. The protocol's security against plaintext attack is also investigated under the concept of information-theoretic indistinguishability of encryption. Finally, we give a conjecture related with the Breidbart's attack.
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http://arxiv.org/abs/1204.6664
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