We discuss on the securities of the two knapsack type public key cryptosystems, one proposed by Kasahara and Murakami(KM-PKC) using shifted-odd sequence and another proposed by Merkle and Hellman(MH-PKC) using super-increasing sequence. We apply Shamir's attack to KM-PKC. We compare the security of MH-PKC with that of KM-PKC from the standpoint of the efficiency when Shamir's attack is applied to them.
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