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Erschienen in:
2009 | OriginalPaper | Buchkapitel
Multi-recipient Public-Key Encryption from Simulators in Security Proofs
verfasst von : Harunaga Hiwatari, Keisuke Tanaka, Tomoyuki Asano, Koichi Sakumoto
Erschienen in: Information Security and Privacy
Verlag: Springer Berlin Heidelberg
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In PKC 2003, Bellare, Boldyreva, and Staddon proposed the reproducibility test. The test determines whether a single-recipient public-key encryption scheme is adapted to transform into an efficient multi-recipient public-key encryption scheme. In this paper, we propose a new approach to design an efficient multi-recipient single-message public-key encryption scheme. We focus on a certain simulator which appears in the security proof of an ordinary (single-recipient) public-key encryption scheme. By considering the behavior of the simulator, we construct two efficient multi-recipient single-message public-key encryption schemes. These schemes show that there exist schemes which can be transformed into efficient multi-recipient schemes, even they do not pass the reproducibility test.