Cryptanalysis of Chatterjee-Sarkar Hierarchical Identity-Based Encryption Scheme at PKC 06

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概要

• 論文の詳細を見る

• In 2006, Chatterjee and Sarkar proposed a hierarchical identity-based encryption (HIBE) scheme which can support an unbounded number of identity levels. This property is particularly useful in providing forward secrecy by embedding time components within hierarchical identities. In this paper we show that their scheme does not provide the claimed property. Our analysis shows that if the number of identity levels becomes larger than the value of a fixed public parameter, an unintended receiver can reconstruct a new valid ciphertext and decrypt the ciphertext using his or her own private key. The analysis is similarly applied to a multi-receiver identity-based encryption scheme presented as an application of Chatterjee and Sarkars HIBE scheme.

• （社）電子情報通信学会の論文
• 2009-07-01

著者

• LEE Dong

  Center for Information Storage Device, Yonsei University

• Park Jong

  Center For Information Security Technologies (cist) Korea University

• Lee Dong

  Center For Information Security Technologies (cist) Korea University

• LEE Dong

  Center for Information and Security Technologies, Korea University

• PARK Jong

  Center for Information and Security Technologies, Korea University

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