Direct Chosen Ciphertext Secure Hierarchical ID-Based Encryption Schemes in the Selective-ID Security Model
Jong Hwan Park, Kyu Young Choi, Dong Hoon Lee · 한국방송미디어공학회 학술발표대회 논문집 · 2007
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.