With the emergence of edge computing and the growth of IoT devices, the data stored at the edge of the network has increased considerably. As more devices connect to the network, privacy and security become major issues to be resolved. The user interacts with edge servers and stores data using IoT devices, and hence the confidentiality of data at the edge server is more important. The confidentiality of data is provided by the digital signatures approach, which is crucial in data security. The existing works use cryptographic algorithms to generate digital signatures, but they suffer from communication and computational overhead as well as from quantum attacks. The proposed work uses the lattice-based algorithm to generate digital signatures using a symmetric key between the edge server and the IoT device. The IoT device can access the data when requested but only after the digital signature is verified by the edge server. The parameter analysis, such as key generation and verification, shows the proposed scheme is better. The security analysis indicates the proposed work is resistant to well-known attacks.