A New Proposal for QKD Relaying Models

—We investigate a quasi-trusted QKD relaying model. This is a three-party communication model. Two nodes Alice and Bob want to establish a secret key. However, the distance between them exceeds the limited range of QKD. Carol is a intermediate node that could share QKD links with Alice and Bob. Carol is assumed to be quasi-trusted: she correctly follows the given three-party protocol. However, she may be eavesdropped by the malicious person Eve. We propose two single-photon based protocols that allow Alice, Carol and Bob to achieve the goal. As a result, these protocols could be applied to securely extend up to two times the limited range of QKD without invoking entangled photons.

• Type: Conference
• Year: 2008
• Where: ICCCN
• Authors: Cuong Le Quoc, Patrick Bellot
• Keywords: Communications, ICCCN 2008, Limited Range, QKD Relaying Model, Three-party Communication Model