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A weak point in network-based applications is that they commonly open some known communication port(s), making themselves targets for Denial of Service (DoS) attacks. Considering adversaries that can eavesdrop and launch directed DoS attacks to the applications' open ports, solutions based on pseudo-random port-hopping have been suggested. As port-hopping needs that the communicating parties hop in a synchronized manner, these solutions suggest acknowledgment-based protocols between a client-server pair or assume the presence of synchronized clocks. Acknowledgments, if lost, can cause a port to be open for a longer time and thus be vulnerable to DoS attacks; Time servers for synchronizing clocks can become targets to DoS attack themselves. Here one studies the case where the communicating parties have clocks with rate drift, which is common in networking.
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