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中文摘要：
针对现有的可撤销属性基加密方案密钥量过大且不稳定和效率不高的缺点,本文提出了一种新的基于多线性映射的撤销方案.该方案基于多线性映射问题,并将公钥广播加密与密文策略的属性基加密相结合,设计两层密文.效率分析表明,该方案达到了私钥和更新密钥的固定量级,提高了效率;在可选择的撤销列表模型下,基于3重多线性Diffie-Hellman Exponent（（3,N）-MDHE）假设,证明了方案是选择明文攻击安全的.
英文摘要：
The existing revocable attribute-based encryption schemes have the disadvantages that the number of private key elements and update key elements are large and non-constant,which lead to the revocation inefficient.In order to solve this problem,a new revocable scheme based on multi-linear maps was proposed.The proposed scheme uses the multi-linear maps to encrypt and decrypt,and makes the careful combination of public key broadcast encryption（PKBE）and ciphertext-policy attribute-based encryption（CP-ABE）,and designs two levels ciphertexts.The efficiency analysis shows that the proposed scheme can reduce the number of the keys,even provide a constant number of key elements,and the new scheme has been proved to be chosen-plaintext attack secure in the selective revocation list model based on the 3-Leveled Multi-linear Diffie-Hellman Exponent（（3,N）-MDHE）assumption.
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