Key Management Schemes for Multilayer and Multiple Simultaneous Secure Group Communication

<table>Key tree structure for multiple groups after user <svg height="11.075" id="M565" style="vertical-align:-3.25793pt" version="1.1" viewbox="0 0 13.625 11.075" width="13.625" xmlns="http://www.w3.org/2000/svg">
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<g transform="translate(72,-63.14)">
<text transform="matrix(1,0,0,-1,-71.95,66.44)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑢</tspan>
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<tspan style="font-size: 8.75px; " x="0" y="0">5</tspan>
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</svg> leaves the group <svg height="14.3875" id="M566" style="vertical-align:-3.25793pt" version="1.1" viewbox="0 0 15.5 14.3875" width="15.5" xmlns="http://www.w3.org/2000/svg">
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<g transform="translate(72,-60.49)">
<text transform="matrix(1,0,0,-1,-71.95,63.79)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑃</tspan>
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International Scholarly Research Notices

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Figure 7

Figure 7: Key Management Schemes for Multilayer and Multiple Simultaneous Secure Group Communication 