Physical Layer Security for Channels with State and Active Eavesdroppers (PLAY SCATE)

具有状态和主动窃听器的通道的物理层安全性 (PLAY SCATE)

• 批准号: 326920355
• 负责人: Professor Dr.-Ing. Holger Boche
• 金额: --
• 依托单位: Lehrstuhl für Theoretische Informationstechnik (LTI)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/326920355?language=en
• 关键词: Physical; Layer; Security; Channels; State

Nowadays, information theoretic approaches to security are intensively discussed as a complement to cryptographic techniques. Such approaches jointly establish reliable communication and data confidentiality at the physical layer by taking the properties of the noisy channel into account. Recently, this area of research has drawn considerable attention since it provides a promising approach to achieve unconditional security and to embed secure communication into wireless networks. In practical systems, CSI will be limited due to the nature of the wireless channel and estimation/feedback inaccuracy.In designing wireless systems resilient against failures caused by nature and robust against malicious attacks, the correct system-theoretic model is the compound and the arbitrarily varying channel, respectively. The CC model applies if the state of the channel is constant for the duration of one codeword. The AVC model is suitable if each channel use is affected by a different channel state. This correctly models malicious attacks.The goal of this project is to understand the fundamental properties of compound wiretap channels and arbitrarily varying wiretap channels with active eavesdroppers who voluntarily influence the channel states. For the system design it is important to consider constraints on the transmit as well as attacker nodes to correctly model their possibilities.In the literature, the characterization of the secrecy capacity of AVWCs relies on methods by Ahlswede. They cannot be applied directly under input and attacker constraints.In particular, it is interesting to determine whether the dichotomy holds under constraints, and for which constraints the resulting secrecy capacity is zero. It is expected that semi-deterministic coding will suffer from symmetrizability due to active attacks. A detailed description of countermeasures is required to achieve the goal to design resilient wireless systems. Furthermore, physical layer key agreement, using the channel model, where the channel is either a CC or an AVC, shall be investigated and optimal transmit strategies will be derived. Additionally, the secrecy capacities of the CWC and the AVWC depend on the underlying uncertainty set. The performance of a communication system should depend in a continuous way on the system parameters. This is because if small changes in the parameters were to lead to dramatic losses in performance, the approach at hand would most likely not be used. Indeed, one is interested in approaches that are robust against such variations, in the sense that small variations in the uncertainty set result in small variations in the secrecy capacity. Such a continuous dependency is desirable in the context of active adversaries who can influence the system parameters in a malicious way.The project will develop information theoretic approaches based on general channel models to model attacks on communication systems with embedded security.

如今，信息论方法作为密码学技术的补充被广泛讨论。这些方法通过考虑噪声信道的特性，在物理层共同建立可靠的通信和数据保密性。最近，这一领域的研究引起了相当大的关注，因为它提供了一种有前途的方法来实现无条件的安全和嵌入无线网络的安全通信。在实际系统中，由于无线信道的性质和估计/反馈的不准确性，CSI将受到限制。在设计具有抗自然故障弹性和抗恶意攻击鲁棒性的无线系统时，正确的系统理论模型分别是复合信道和任意变信道。如果通道的状态在一个码字的持续时间内是恒定的，则CC模型适用。如果每个通道的使用受到不同通道状态的影响，则AVC模型是合适的。这可以正确地模拟恶意攻击。本项目的目标是了解复合窃听信道和任意变化窃听信道的基本特性，主动窃听者会主动影响信道状态。对于系统设计，重要的是要考虑对传输和攻击者节点的约束，以正确地建模它们的可能性。在文献中，avwc保密能力的表征依赖于Ahlswede的方法。它们不能在输入和攻击者约束下直接应用。特别是，确定二分类是否在约束条件下成立，以及在哪些约束条件下产生的保密能力为零是很有趣的。由于主动攻击，半确定性编码可能会出现不对称的情况。为了实现设计弹性无线系统的目标，需要详细描述对抗措施。此外，将研究使用信道模型（其中信道为CC或AVC）的物理层密钥协议，并推导出最佳传输策略。此外，《禁止化学武器公约》和《禁止化学武器公约》的保密能力取决于潜在的不确定性集。通信系统的性能应以连续的方式依赖于系统参数。这是因为如果参数的微小变化会导致性能的巨大损失，那么手边的方法很可能不会被使用。事实上，人们对对这种变化具有鲁棒性的方法感兴趣，因为不确定性集的小变化会导致保密能力的小变化。这种持续的依赖关系在能够以恶意方式影响系统参数的主动攻击者的上下文中是可取的。该项目将开发基于通用信道模型的信息理论方法，以模拟对具有嵌入式安全的通信系统的攻击。