关键词: 可搜索加密, 无证书的可搜索加密, 双线性Diffie-Hellman问题, 密钥托管

Abstract:

Identity Based Public Key Encryption with Keyword Search（IBEKS） using identity information as a public key realizes the public key and user natural binding, avoiding the complicated digital certificate in PKI and eliminating the step of certificate authentication, but it also brings some problems, such as key escrow, key revocation. So that, on the basis of existing Certificateless Identity-Based Encryption scheme（CL-IBE）, the scheme of Certificateless Public Key Encryption with Keyword Search（CL-PEKS） is firstly proposed. And the proof of the consistence for the algorithm is given, the complexity of the algorithm is analyzed. The definition of CL-PEKS which is indistinguishable against CCA2 is also presented. The program can provide the function of protecting the security of keyword under the circumstance of big data to the third-party server storage, at the same time the key escrow problem in IBEKS is solved.

Key words: Public Key Encryption with Keyword Search（PEKS）, Certificateless Public Key Encryption with Keyword Search（CL-PEKS）, Bilinear Diffie-Hellman problem（BDH）, key escrow