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Cloud computing economically enables the paradigm of data service outsourcing. However, to protect the secret data, sensitive information in cloud first the data has to be encrypted before outsourced to the commercial public cloud. It is a very challenging task. Although traditional attribute based encryption technique allow users to securely search the data by using keywords, they support only Boolean search and are not yet sufficient to meet the effective data utilization need that isdoi:10.5120/15873-4885 fatcat:kgkheag6qjemvcukgmlj5ph26a