| Summary: | To authorize others to deal with encrypted mails and enable the search of encrypted mails in an encrypted email system,this paper proposes a proxy re-encryption scheme that supports keyword search for email systems.In this scheme,searchable encryption technology is used to search encrypted mails,and then proxy re-encryption technology is used to authorize encrypted mails.Security certification and efficiency analysis results show that the proposed scheme can better resist tampering attacks and keyword offline guessing attacks.At the same time,under the standard model,it is proven that the scheme respectively meets trapdoor privacy security,keyword privacy security and ciphertext privacy security in the determination of the Diffie-Hellman problem,the Decisional Bilinear Diffie-Hellman(DBDH) problem,and the Quotient Decisional Bilinear Diffie-Hellman(QDBDH) problem.Compared with the dPRES scheme,the proposed scheme reduces the time cost and improves the efficiency of search and decryption.
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