This involves unavoidable computational cost.

这会涉及到不可避免的计算开销.

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Compared with current schemes, our schemes have lower communication cost and computational cost.

相对目前的一些方案, 本文方案具有更小的通信代价和计算代价.

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The scheme provides authentication independent of digital certification and its computational cost is reduced to O ( log 3 n ).

该方案不依赖数字证书提供认证,计算开销降低到O ( log3n ).

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