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Miller, in 1985 and Koblitz, in 1987 pointed out notable methods to make out cryptosystems based on elliptic curves over finite field F_q. They both used one elliptic curve to set up cryptosystems. However, there exists one obvious fault in their methods such that some plantexts can not be imbedded in elliptic curve. So, some plantexts can not be encrypted. 相似文献
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