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The pervasiveness of the Internet has attracted a new paradigm of technology known as Internet-of-Things (IoT). The numerous devices connected to IoT generate huge amount of data which must be protected and efficiently verified by the data center. To achieve big data authentication in IoT, several certificateless aggregate signature schemes have been proposed. However, their design is based on bilinear pairing operation, which is known to be mathematically complex. In this work, we propose a secure and efficient data aggregation scheme for IoT known as Efficient Data Aggregation Scheme (EDAS) without using complex mathematical operation. The performance analysis shows that EDAS is computationally more efficient than related schemes.