Abstract:

Due to anonymity and key escrow problem in the IBE scheme, a reducing trust in the PKG and anonymous identitybased encryption scheme is proposed based on the scheme of Waters and the ideas of Goyal on composite order groups, which is secure without random oracles in the standard model. The analysis shows that the scheme satisfies anonymity and reduces trust in the PKG under the DBDH assumption and DL assumptions. It can not only protect receivers’ privacy, but effectively solve the key escrow problem.

Key words: reducing trust in the PKG;anonymous;IBE;DBDH assumption;DL assumption