Direct chosen-ciphertext technique for identity-based broadcast encryption

作者：Zhang Leyou^*; Wu Qing; Hu Yupu

来源：Journal of Computational Information Systems, 2011, 7(9): 3343-3350.

• Bilinear Diffie-Hellman problem
• Broadcast encryption
• CCA
• Ciphertexts
• DBDH problem
• Direct chosen-ciphertext technique
• IBBE
• Identity-based
• Private key
• The standard model

A "direct chosen-ciphertext technique" is introduced to construct CCA secure identity-based broadcast encryption(IBBE) scheme. The new scheme achieves constant size private keys and constant size ciphertexts, which solve the trade-off between the private keys size and ciphertexts size. In addition, under the standard model, the security of the new scheme is reduced to the general hardness assumption-decision bilinear Diffie-Hellman problem(DBDH). This assumption is more natural than many of the hardness assumptions recently introduced to IBBE in the standard model.

• 出版日期2011
• 单位西安电子科技大学