He-HTLC: Revisiting Incentives in HTLC with Kartik Nayak | a16z crypto research talks скачать в хорошем качестве

He-HTLC: Revisiting Incentives in HTLC with Kartik Nayak | a16z crypto research talks

Hashed Time-Locked Contracts (HTLCs) are a widely used primitive in blockchain systems for such applications as payment channels, atomic swaps, and son on. Unfortunately, HTLC is incentive-incompatible and is vulnerable to bribery attacks. MAD-HTLC is an elegant solution aiming to address the incentive incompatibility of HTLC. In this talk, Kartik Nayak (Duke University) shows that MAD-HTLC is also incentive-incompatible. But beyond that, Kartik goes on to demonstrate the importance of considering actively rational behaviors by showing three novel reverse-bribery attacks against MAD-HTLC that can be implemented using Trusted Execution Environments. He also shows that reverse bribery can be combined with original delaying attacks to render MAD-HTLC insecure regardless of the relationship between collateral and deposits made in the contract. Based on these findings, he devises a new lightweight smart contract specification, He-HTLC, that meets the HTLC specification even in the presence of actively rational miners. About the speaker Kartik is an assistant professor in the Department of Computer Science at Duke University. He works in the areas of security, applied cryptography, distributed computing, and blockchains. Before joining Duke University, he spent a year as a postdoctoral researcher at VMware Research. Kartik is a recipient of the 2016 Google Ph.D. fellowship in Security. His research is funded by NSF Awards, VMware Early Career Grant Award, Novi, and Ethereum Foundation. About a16z crypto research a16z crypto research is a multidisciplinary lab that works closely with our portfolio companies and others toward solving the important problems in the space, and toward advancing the science and technology of the next generation of the internet. Our researchers are technologists, scientists, cryptographers, and cryptocurrency experts, working to bridge the worlds of academic theory with industry practice, and to help shape crypto and web3 as a formal area of study. More about us: a16z.com/2022/04/21/announcing-a16z-crypto-research More from the a16z crypto team Subscribe to our 'web3 weekly newsletter': a16zcrypto.substack.com Listen to our 'web3 with a16z' podcast: a16zcrypto.com/web3-with-a16z-podcast/ Read more of our work: a16zcrypto.com