保证了交换数据的机密性和交换拓扑的保密性（包括第三方）；
The participants can barter with others at their will and the exchange topology is unknown to others including the off-STTP.
保证了交换数据的机密性和交换拓扑的保密性（包括第三方）；
The participants can barter with others at their will and the exchange topology is unknown to others including the off-STTP.
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