Cryptanalysis of a Hierarchical Identity-based Encryption Scheme

• Main Authors: WENG, Jian, CHEN, Min-Rong, CHEN, Kefei, DENG, Robert H.
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2010
• Subjects: hierarchial identity-based encryption; chosen-ciphertext attack; chosen-plaintext attack; information security; Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/1305; https://doi.org/10.1587/transfun.E93.A.854
• Institution: Singapore Management University

Hierarchical Identity-Based Encryption (HIBE) is a generalization of identity-based encryption that mirrors an organizational hierarchy, and allows the root Private Key Generator (PKG) to distribute the workload of key generations to lower-level PKGs. In Indocrypt'08, Ren and Gu proposed a new HIBE scheme, and claimed that their scheme is fully chosen-ciphertext secure in the standard model. However, by giving a concrete attack, we show that Ren-Gu's HIBE is even not chosen-plaintext secure.