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In the utility-based routing protocol of delay-tolerant networks (DTNs), nodes calculate routing utility value by encounter time, frequency, and so on, and then forward messages according to the utility. The privacy information of encounter time and frequency will be leaked when nodes communicate with real IDs. Node ID anonymity can protect the privacy information, but it also prevents nodes from collecting encounter information to calculate the real utility value. To solve the above problem,doi:10.3390/info10040128 fatcat:yqryu6iuevatvdj3vpfwpnr2aq