基于往返延时一致性测量的远程有线多跳网络密钥协商机制OA

Conventional key agreement schemes rely on computational hardness assumptions and are vulnerable to future quantum attacks,while wireless physical-layer methods based on channel reciprocity suffer from distance sensitivity and poor adaptability to multi-hop topologies.To address these issues,this paper proposes a remote key agreement mechanism for wired multi-hop networks that exploits the consistency of network-layer round-trip time(RTT)as a candidate entropy source.The legitimate endpoints perform active probing using Internet Control Message Protocol(ICMP)Echo requests and replies,record bidirectional RTT sequences,and extract frequency-domain magnitude spectra of delay jitter to characterize the path response.After weighted moving average(WMA)preprocessing,cumulative distribution function(CDF)-based quantization generates initial bit sequences,followed by Cascade information reconciliation and 2-universal hashing privacy amplification to produce a final consistent key.Experiments on a cross-regional cloud testbed show that the average initial key agreement rate reaches 72.33%,and after reconciliation the final consistency is 100%.The generated keys pass the National Institute of Standards and Technology(NIST)randomness tests,with an average generation rate of about 500 bit/s.Furthermore,path-internal eavesdropping experiments demonstrate that an adversary observing only local link delays achieves bit agreement rates close to random guessing(≤54.4%),confirming the structural asymmetry of bidirectional RTT measurements.A quantitative information-theoretic analysis shows that the scheme can extract about 834 bits of secure key under typical parameters.This work extends the entropy source of unconditionally secure key generation from physical-layer wireless features to network-layer delay characteristics,offering a practical solution for remote terminal key establishment in power communication networks and similar infrastructure scenarios without relying on public-key infrastructure.