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="M514" style="vertical-align:-3.25793pt" version="1.1" viewbox="0 0 19.1 11.075" width="19.1" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,11.075)">
<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>
</text>
<text transform="matrix(1,0,0,-1,-66.02,63.31)">
<tspan style="font-size: 8.75px; " x="0" y="0">1</tspan>
<tspan style="font-size: 8.75px; " x="4.3759999" y="0">6</tspan>
</text>
</g>
</g>
</svg> joins the group <svg height="14.3875" id="M515" 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">
<g transform="matrix(1.25,0,0,-1.25,0,14.3875)">
<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>
</text>
<text transform="matrix(1,0,0,-1,-64.52,60.66)">
<tspan style="font-size: 8.75px; " x="0" y="0">3</tspan>
</text>
</g>
</g>
</svg>.</table>

International Scholarly Research Notices

fig5

Figure 5

Figure 5: Key Management Schemes for Multilayer and Multiple Simultaneous Secure Group Communication 