• Publications
  • Influence
Zerocash: Decentralized Anonymous Payments from Bitcoin
TLDR
This paper formulate and construct decentralized anonymous payment schemes (DAP schemes) and builds Zero cash, a practical instantiation of the DAP scheme construction that is orders of magnitude more efficient than the less-anonymous Zero coin and competitive with plain Bit coin.
Zerocoin: Anonymous Distributed E-Cash from Bitcoin
TLDR
Zerocoin is proposed, a cryptographic extension to Bitcoin that augments the protocol to allow for fully anonymous currency transactions and uses standard cryptographic assumptions and does not introduce new trusted parties or otherwise change the security model of Bitcoin.
Charm: a framework for rapidly prototyping cryptosystems
TLDR
The modular architecture of Charm is described, which includes a built-in benchmarking module to compare the performance of Charm primitives to existing C implementations, and it is shown that in many cases the techniques result in an order of magnitude decrease in code size, while inducing an acceptable performance impact.
Bolt: Anonymous Payment Channels for Decentralized Currencies
TLDR
This work introduces techniques for constructing anonymous payment channels, including a technique that allows payments via untrusted intermediaries, and builds a concrete implementation of the scheme and shows that it can be deployed via a soft fork to existing anonymous currencies such as ZCash.
Forward Secure Asynchronous Messaging from Puncturable Encryption
TLDR
Puncturable encryption is introduced, a new form of encryption that recipients may repeatedly update their decryption keys to revoke decryption capability for selected messages, recipients or time periods, and does not require the recipients to communicate with or distribute new key material to senders.
ZEXE: Enabling Decentralized Private Computation
TLDR
It is demonstrated how to use ZEXE to realize privacy-preserving analogues of popular applications: private user-defined assets and private decentralized exchanges for these assets.
Accountable Privacy for Decentralized Anonymous Payments
TLDR
This work proposes an initial approach to addressing privacy preserving policy-enforcement mechanisms that guarantee regulatory compliance, allow selective user tracing, and admit tracing of tainted coins (e.g., ransom payments).
Fairness in an Unfair World: Fair Multiparty Computation from Public Bulletin Boards
TLDR
This work presents a new model for achieving fairness in MPC against dishonest majority by using public bulletin boards implemented via existing infrastructure such as blockchains or Google's certificate transparency logs.
Decentralized Anonymous Credentials
TLDR
This work proposes a novel anonymous credential scheme that eliminates the need for a trusted credential issuer and provides a proof of security for a basic anonymous credential system that allows users to make flexible identity assertions with strong privacy guarantees without relying on trusted parties.
Updatable and Universal Common Reference Strings with Applications to zk-SNARKs
TLDR
By design, existing (pre-processing) zk-SNARKs embed a secret trapdoor in a relation-dependent common reference strings (CRS) that facilitates a linear-size CRS and linear-time prover computation.
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