【摘要】 目前,大多数HIBE方案都是基于素数阶双线性群的,其密钥和密文中的参数都是在素数阶双线性群上的取值。构造了一种基于组合阶双线性群的HIBE方案。密钥元组中各个参数从一素数阶群中取值,而密文元组的各个参数等于两个不同素数阶群的元素之积,其中一素数阶群的元素充当盲化因子。盲化后的密文能够增强新HIBE方案的安全性。在实际解密过程中,密文中的盲化因子对解密并没有任何影响。新的HIBE方案在标准模型下实现了选择身份攻击安全。更多还原

【Abstract】 Presently,most of the HIBE schemes are based on the prime order bilinear groups.The author constructed a HIBE scheme based on composite order bilinear groups.The component parameters of secret key tuple are those elements in an group of prime order while the ones of ciphertext tuple are the products of some elements in two groups,which are of different prime order,and elements in one of these groups,which act as blind factors.The blinded ciphertext enhances the security of the new HIBE scheme.The blind factors of the ciphertext have no effects on the decryption.The new HIBE scheme is selective-ID secure in the standard model.更多还原