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结合组合公钥的思想提出了一个较实用的基于身份的加密方案(IBE方案)——L-IBE方案。在安全性方面,L-IBE具有标准模型下可证明安全性,即在标准模型下有效的实现了DDH问题到新IBE方案的IND-sID-CPA攻击者的归约,并通过对比可知,其在模型、难题假设和归约程度方面优势明显。通过仿真表明,和已有的知名方案相比,L-IBE方案在计算效率(加解密计算开销)、密文长度和密钥长度方面具有更好的性能指标。由于L-IBE方案无需在线可信第三方即可实现节点间安全认证,适用于无固定基础设施支撑的多跳无线电网络密钥管理。
Combined with the idea of combined public key, a more practical identity-based encryption scheme (IBE scheme) - L-IBE scheme is proposed. In terms of security, L-IBE has the proof of security under the standard model, that is, the reduction of DDH problem to IND-sID-CPA attacker in the new IBE scheme can be effectively implemented under the standard model. By contrast, There are obvious advantages in terms of model, difficulty hypothesis and degree of reduction. The simulation results show that the L-IBE scheme has better performance in terms of computational efficiency (encryption and decryption overhead), ciphertext length and key length compared with the existing known schemes. Because L-IBE scheme does not require online trusted third parties to achieve inter-node security authentication, it is applicable to multi-hop radio network key management without fixed infrastructure support.