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Secure Off-Chain Payment Protocol From Ciphertext Unlinkable Autonomous Path Proxy Re-Encryption in Blockchain
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Summary
Researchers propose a secure off-chain payment protocol (SOCP) for blockchain payment-channel networks that addresses interception attacks on the Lightning Network, where hash preimages travel in plaintext and malicious intermediate nodes can claim funds without passing them on. The protocol is built on a new primitive, the ciphertext unlinkable autonomous path proxy re-encryption scheme (CUAP-PRE), which lets the delegator designate only trusted delegatees and resists homology inference and delegation path tracing. The authors claim post-compromise security under the DBDH assumption in the random oracle model, supported by formal proofs and evaluations.
Mitigation
The source proposes the SOCP protocol and the CUAP-PRE primitive as the mitigation. No separate fix, patch, configuration change or workaround is stated.