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    초록·키워드

    It has been widely believed that one can obtain l-Hierarchical Identity Based Encryption (HIBE) scheme secure against chosen ciphertext attacks from (l+1)-HIBE scheme secure against chosen plaintext attacks. In this paper, however, we show that when applying two concrete HIBE schemes that Boneh et al. [1, 2] proposed, chosen ciphertext secure l-HIBE schemes are directly derived from chosen plaintext secure l-HIBE schemes. Our constructions are based on a one-time signature-based transformation that Canetti et al. [3] proposed. The security of our schemes is proved in the selective-ID security model without using random oracles.

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      UCI(KEPA) : I410-ECN-0101-2009-568-016671770