Blockchain-Based Privacy Protection Scheme for IoT-Assisted Educational Big Data Management

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/wcmc/volume-2021/3558972/figures/3558972.fig.007a.svgz" name="3558972.fig.007a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Students are studying</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/wcmc/volume-2021/3558972/figures/3558972.fig.007b.svgz" name="3558972.fig.007b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Class is over</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/wcmc/volume-2021/3558972/figures/3558972.fig.007c.svgz" name="3558972.fig.007c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Empty classroom</td></tr></table>

Wireless Communications and Mobile Computing

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Figure 7

Figure 7: Blockchain-Based Privacy Protection Scheme for IoT-Assisted Educational Big Data Management 