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hello everyone my name is yuyu wang iamp;#39;m from uestc our title is fine grain secure attribute-based encryption letamp;#39;s join the work with judgement and return for cryptographic scheme we usually require that hanami safari can run the scheme in polynomial time and the scheme can be secure against polynomial time adversaries by now there have been a great deal of works constructing cryptographic schemes that are secure based on quality functions factoring discrete logarithm ddh lwe or even the existence of generic groups and outbreak groups however we do not know whether these assumptions hold so itamp;#39;s desirable to use no assumptions or mild complexity worst case assumptions so that we can still have cryptography even if for example one functions do not exist but in the long history of cryptography it has turned out that this is quite difficult fine fine-grained cryptography gives us a direction in approaching this problem instead of considering polynomial time on its
