Research on the Encrypted Data Access Control of Multi-purpose Asynchronous WSN The data storaged in multi-purpose asynchronous wireless sensor network should be encrypted to protect against physical attacks. Meanwhile,in multi-purpose wireless sensor network,an access control mechanism is needed to differentiate the encrypted data which belong to different applications. However, as the author knows, by far, no secure scheme solving this problem has been proposed. In this paper, we introduce an attribute-based encryption scheme to address the encrypted data storage and access control issues, through experiment and analysis we prove that the ABE scheme could be applied to multi-purpose asynchronous WSN.