Recently, there is an exponential increase in the multimedia and other data over the Internet of Things (IoT). This data is generally send to the cloud for processing and storage. The fog layer in-between readily bridges communication among the IoT devices and the cloud. It delivers services efficiently by computing and analyzing various multimedia information generated by the IoT devices residing on the sensors. However, provision of effective security and energy are critical challenges. The purpose of this work is to enhance the secure transfer of information like multimedia. This scheme uses Message Queue Telemetry Transport (MQTT) protocol over SSL/TLS. Since MQTT is vulnerable to eavesdropping, the Elliptic curve-ElGamal cryptography algorithm is introduced which lends a homomorphic factor thereby mitigating man-in-the-middle attack. The dynamic key change and proportional offloading of data as proposed in the current research work helps to preserve node energy by selectively transferring data to the cloud and the fog according to the data topic. The results depict that the system security and lifetime can be improved in comparison to the existing protocols.

最近，物联网（IoT）上的多媒体和其他数据呈指数增长。通常将这些数据发送到云进行处理和存储。两者之间的雾层很容易桥接物联网设备和云之间的通信。它通过计算和分析驻留在传感器上的IoT设备生成的各种多媒体信息来有效地提供服务。但是，提供有效的安全性和能源是至关重要的挑战。这项工作的目的是增强多媒体等信息的安全传输。该方案使用基于SSL / TLS的消息队列遥测传输（MQTT）协议。由于MQTT容易被窃听，因此引入了椭圆曲线ElGamal加密算法，该算法可提供同构因数，从而减轻了中间人攻击。话题。结果表明，与现有协议相比，可以提高系统安全性和生存期。