The Symmetric Two-Hop Channel with an Untrusted Relay
| Autor: | Shahab Ghasemi-Goojani, Panagiotis Papadimitratos |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
021110 strategic
defence & security studies Computer science business.industry ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS 0211 other engineering and technologies 020206 networking & telecommunications Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology Channel models Scrambling law.invention Hop (networking) Relay law Secrecy Computer Science::Networking and Internet Architecture 0202 electrical engineering electronic engineering information engineering business Decoding methods Computer Science::Cryptography and Security Computer Science::Information Theory Computer network |
| Zdroj: | ISITA |
| DOI: | 10.23919/isita.2018.8664257 |
| Popis: | We study, using information-theoretic security methods, the so-called symmetric two-hop channel with an untrusted relay. In this model, a source wants to send its message reliably and securely to the destination through an honest but curious relay. The relay acts as a passive eavesdropper. Our investigation, in line with the relevant literature, seeks to determine what rate, termed secrecy rate, is achievable. To do that, we consider a typical setting, with the destination cooperating with the source, sending a ’scrambling’ signal to conceal the message from the relay. To derive the achievable secrecy rate, we propose a novel scheme based on nested lattice codes. We show that our scheme outperforms all existing schemes and it achieves the outer bound for this channel model within 0.33 bits. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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