Age of Trust (AoT): A Continuous Verification Framework for Wireless Networks
arxiv(2024)
摘要
Zero Trust is a new security vision for 6G networks that emphasises the
philosophy of never trust and always verify. However, there is a fundamental
trade-off between the wireless transmission efficiency and the trust level,
which is reflected by the verification interval and its adaptation strategy.
More importantly, the mathematical framework to characterise the trust level of
the adaptive verification strategy is still missing. Inspired by this vision,
we propose a concept called age of trust (AoT) to capture the characteristics
of the trust level degrading over time, with the definition of the time elapsed
since the last verification of the target user's trust plus the initial age,
which depends on the trust level evaluated at that verification. The higher the
trust level, the lower the initial age. To evaluate the trust level in the long
term, the average AoT is used. We then investigate how to find a compromise
between average AoT and wireless transmission efficiency with limited
resources. In particular, we address the bi-objective optimization (BOO)
problem between average AoT and throughput over a single link with arbitrary
service process, where the identity of the receiver is constantly verified, and
we devise a periodic verification scheme and a Q-learning-based scheme for
constant process and random process, respectively. We also tackle the BOO
problem in a multiple random access scenario, where a trust-enhanced
frame-slotted ALOHA is designed. Finally, the numerical results show that our
proposals can achieve a fair compromise between trust level and wireless
transmission efficiency, and thus have a wide application prospect in various
zero-trust architectures.
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