(Deterministic) Hierarchical Identity-Based Encryption From Learning With Rounding Over Small Modulus
ASIA-CCS(2016)
摘要
In this paper, we propose a hierarchical identity-based encryption (HIBE) scheme in the random oracle (RO) model based on the learning with rounding (LWR) problem over small modulus q. Compared with the previous HIBE schemes based on the learning with errors (LWE) problem, the ciphertext expansion ratio of our scheme can be decreased to 1/2. Then, we utilize the HIBE scheme to construct a deterministic hierarchical identity-based encryption (D-HIBE) scheme based on the LWR problem over small modulus. Finally, with the technique of binary tree encryption (BTE) we can construct HIBE and D-HIBE schemes in the standard model based on the LWR problem over small modulus.
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关键词
(hierarchical) identity-based encryption,deterministic (hierarchical) identity-based encryption,learning with rounding
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