A Privacy-Preserving Route Leak Protection Mechanism Based on Blockchain

Route Leak Protection (RLP) is proposed to prevent route leaks in Border Gateway Protocol (BGP). However, the Autonomous System (AS) cannot detect the RLP information that may have been tampered, due to the lack of full view of all the inter-domain routing policies. In addition, RLP may leak the commercial relationship with other ASes and routing policies that ASes want to keep confidential. In this paper, we present a privacy-preserving route leak protection mechanism called RLPchain based on the blockchain and trusted execution environment. In RLPchain, each AS maintains a global confidential and tamper-proofing inter-domain routing policy repository, detecting and preventing inter-domain routing leaks. Moreover, a compatible deployment scheme is designed with only minor changes to the current BGP system. Finally, we implement the RLPchain and evaluate its performance on Microsoft Azure. Experimental results show that RLPchain has great performance in preventing routing leaks without trading off the privacy of routing policies.