IoTSign: Protecting Privacy and Authenticity of IoT using Discrete Cosine Based Steganography

Remotely generated data by Intent of Things (IoT) has recently had a lot of attention for their huge benefits such as efficient monitoring and risk reduction. The transmitted streams usually consist of periodical streams (e.g. activities) and highly private information (e.g. IDs). Despite the obvious benefits, the concerns are the secrecy and the originality of the transferred data. Surprisingly, although these concerns have been well studied for static data, they have received only limited attention for streaming data. Therefore, this paper introduces a new steganographic mechanism that provides (1) robust privacy protection of secret information by concealing them arbitrarily in the transported readings employing a random key, and (2) permanent proof of originality for the normal streams. This model surpasses our previous works by employing the Discrete Cosine Transform to expand the hiding capacity and reduce complexity. The resultant distortion has been accurately measured at all stages - the original, the stego, and the recovered forms - using a well-known measurement matrix called Percentage Residual Difference (PRD). After thorough experiments on three types of streams (i.e. chemical, environmental and smart homes), it has been proven that the original streams have not been affected (< 1 %). Also, the mathematical analysis shows that the model has much lighter (i.e. linear) computational complexity O(n) compared to existing work.

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