Information theoretic secrecy for multiple access and broadcast channels

多址和广播信道的信息理论保密

• 批准号: 253552306
• 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: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/253552306?language=en
• 关键词: Information; theoretic; secrecy; multiple; access

In current cellular systems, operators already offer not only traditional services such as voice communication,but also further multicast services or confidential services that are subject to certain secrecy constraints.Nowadays, the integration of multiple services is realized by policies that allocate different services on differentlogical channels and transmit them independently at the physical layer. In general this is quite inefficient andthus there is a trend to merge multiple coexisting services efficiently from an information theoretic point of viewso that they work on the same wireless resources. Further secrecy is realized on higher levels by applyingcryptographic techniques. Unfortunately, such techniques rely on the assumption of insufficient computationalcapabilities of non-legitimate receivers for the decoding of the confidential information. In general, however, those asumptions are difficult to verify. Thus, it is of interest to investigate alternative security measures such as physical layer secrecy techniques, which realize security at the physical layerand do not rely on such assumptions. Therefore, such techniques provide so-called unconditional security.This project analyzes information theoretic or physical layer security in multiple access and broadcastchannels. These are the basic models for the uplink and downlink in a cellular system and, thus, important formobile communication. In this project we want to analyze how to achieve information theoretic security and tocharacterize the fundamental limits. In this project we further want to analyze the impactof channel knowledge at the transmitter and receiver on the secrecy. Especially in systems with an externaleavesdropper, the assumption of perfect channel state information of the channel to the non-legitimatereceiver is quite unrealistic. Therefore, we need robust strategies that achieve security even under channeluncertainty. Another research topic is the topology of the network. In certain networks there is side informationavailable at the transmitter or receiver. We want to analyze the impact of side information on the security.

在当前的蜂窝系统中，运营商不仅提供语音通信等传统业务，而且还提供组播业务或保密业务，这些业务都受到一定的保密性约束，目前多业务的融合是通过在不同的逻辑信道上分配不同的业务并在物理层独立传输的策略来实现的。在一般情况下，这是相当低效的，因此有一种趋势，合并多个共存的服务有效地从信息理论的角度来看，使他们工作在相同的无线资源.通过应用密码技术，进一步实现了更高层次的保密性。不幸的是，这种技术依赖于非合法接收器的计算能力不足的假设，用于解码的机密信息。 然而，一般来说，这些假设很难核实。因此，它是感兴趣的调查替代安全措施，如物理层保密技术，实现在物理层的安全性，不依赖于这样的假设。因此，这些技术提供了所谓的无条件安全。本项目分析了多址和广播信道中的信息理论或物理层安全。这些是蜂窝系统中上行链路和下行链路的基本模型，因此对移动通信很重要。在这个项目中，我们要分析如何实现信息理论的安全性，并描述基本的限制。在这个项目中，我们进一步分析了在发送端和接收端的信道知识对保密性的影响。特别是在存在外部窃听者的系统中，假设非合法接收者完全知道信道的状态信息是很不现实的。因此，我们需要强大的策略，即使在信道不确定性下也能实现安全。另一个研究主题是网络的拓扑结构。在某些网络中，在发射机或接收机处存在可用的边信息。我们要分析边信息对安全性的影响。