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It is required to invent the public-key cryptosystem(PKC) that is based on an NP-hard problem so that the quantum computer might be realized. The knapsack PKC is based on the subset sum problem which is NP-hard. In this paper, we propose a construction method of knapsack PKC using a linear transformation of the secret sequences over integer ring with the Chinese remainder theorem as the trapdoor. The proposed scheme is secure against Shamir's attack and Adleman's attack and invulnerable to the low-density attack.
Date of Conference: 17-20 Oct. 2010