A lightweight unstructured device state image encryption and collection scheme

Industrial Internet-of-Things (IoT) has recently emerged and is undergoing rapid development, and image data collected through IoT nodes or terminals is related to personal information. For the protection of image data in IoT, especially in smart grid, we propose a new lightweight image encryption and collection scheme. First of all, a random permutation matrix was used to disturb the association between original and encrypted images. Secondly, to further strengthen the encryption, we select only a portion of bits from the blinding matrix for encryption, instead of encrypting the entire image. After receiving the encrypted data, the data center performs the inverse operations to decrypt the image. Performance analysis shows that, compared to the counterparts, our scheme is more efficient and feasible, can be applied for resource-limited equipment and is ideal for protecting sensitive images.