Adaptively secure hierarchical identity-based encryption in the standard model

作者：Wu Qing^*

来源：ICIC Express Letters, 2011, 5(4 B): 1321-1326.

• Adaptive security
• Dual system encryption
• Hierarchical identity-based encryptions
• Identity-based encryption
• Provable security

Hierarchical identity-based Encryption (HIBE) has wide applications in the large network. The main challenge at present is to construct a high efficient and strong secure HIBE with a low computation cost. In this paper, a new construction of HIBE scheme is proposed at first. However, the new scheme only achieves the weak adaptive security. To achieve adaptive security, dual system encryption is applied. The modified scheme has short public parameters and constant size ciphertexts. In addition, the private keys size shrinks as the hierarchy depth increases. The cost of verification only requires two bilinear pairings, which are independent of hierarchy depth. Furthermore, the schemes are provably secure in the standard model.

• 出版日期2011