IC3: Advancing the science and applications of blockchains

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by Fan Zhang, Steven Goldfeder, and Ari Juels on Tuesday September 03, 2019 at 02:00 PM
An oracle is a service that provides data to smart contracts or other systems. Oracles obtain their data from trusted websites. But even those that relay data correctly cannot safely access users' web-session data, because they can't enforce privacy. DECO is a privacy-preserving oracle protocol. Using cryptographic techniques, it lets users prove facts about their web (TLS) sessions to oracles while hiding privacy-sensitive data. DECO can make private and public web data accessible to a rich spectrum of applications, for blockchains and traditional (non-blockchain) systems.
by Aman Ladia and Andrew Miller on July 17, 2019
ZeroWallet is a new protocol that uses zero knowledge proofs to secure private keys with low-entropy passwords. It provides the convenience of brain wallets with a security guarantee comparable to third party multi-sig setups.
by Amani Moin and Kevin Sekniqi on May 07, 2019 at 09:30 AM
Some algorithmic stablecoins have proposed incorporating price feeds by asking their token holders. In this post, we point out that this mechanism is broken because of a fundamental incentive misalignment.
by Deepak Maram, Fan Zhang, and Ari Juels on April 05, 2019 at 09:00 AM
Achieving true decentralization requires decentralized cryptography. CHURP is a cryptographic protocol for secret sharing in decentralized settings. In such a setting where nodes may come and go, traditional secret sharing (e.g., Shamir's) is no longer secure. Featuring several fundamental innovations, CHURP accomplishes the mission while being 2300x more efficient than previous schemes!
by Soumya Basu, David Easley, Maureen O'Hara, and Emin Gün Sirer on January 22, 2019 at 11:31 AM
We describe why the fee market is fundamentally broken and propose an alternative fee mechanism that fixes the issues with the current fee market.
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News & Events

Friday November 22, 2019
IC3 faculty, students, sponsors, an guests gather at IC3 Retreats to discuss the major technical challenges, issues and innovatve solutions to widespread blockchain adoption.
Thursday October 24, 2019
Tyler Kell is a Research Engineer at Cornell Tech & the Initiative for Cryptocurrencies and Contracts (IC3) in New York City. In a prior life, before becoming a researcher, he worked as a penetration tester and security consultant.
Wednesday October 2, 2019
Phil Daian is a noted researcher, second year PhD student at Cornell and IC3, and a software engineer with a passion for computer security and applied cryptography. His research interests span several computer science subfields, with a focus in his current work primarily covering cryptocurrencies and smart contracts.
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Featured Projects

OmniLedger: A Secure, Scale-Out, Decentralized Ledger via Sharding

OmniLedger is a novel scale-out decentralized ledger framework that preserves longterm security under permissionless operation by using bias-resistant public-randomness for choosing large, statistically representative shards that process transactions, and by introducing Atomix, an efficient cross-shard commit protocol, that atomically handles transactions affecting multiple shards. OmniLedger's throughput scales linearly in the number of active validators, supporting Visa-level workloads and beyond, while confirming typical transactions in under two seconds thanks to its low-latency "trust-but-verify" transaction validation mechanism. For further details, please check out https://eprint.iacr.org/2017/406.pdf.


More projects:

  • Autonomous Blockchains: A New Blockchain Architecture Based on Free-Standing, Immutable, Eidetic Databases
  • monoCash: The First Off-Chain Payment Network
  • I Can't Believe It's Not Stake!: Resource Exhaustion Attacks on PoS
  • TxProbe: A new Mechanism for Inferring the Topology of the Bitcoin P2P Network
  • Ostraka: Secure Blockchain Scaling by Node Sharding
Even more projects...

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