This Week in Blockchain Research Issue #96
|zk Capital||Feb 17|
Paper of the Week:
Although there have been many successes in verifying proofs of non-interactive cryptographic primitives such as encryption and signatures, formal verification of interactive cryptographic protocols is still a nascent area.
While in principle, it seems possible to extend general frameworks such as Easy- crypt to encode proofs for more complex, interactive protocols, a big challenge is whether the human effort would be scalable enough for proof mechanization to eventually acquire mainstream usage among the cryptography community.
This paper works toward closing this gap by introducing a simple framework, Interactive Probabilistic Dependency Logic (IPDL), for reasoning about a certain well-behaved subset of cryptographic protocols.
A primary design goal of IPDL is for formal cryptographic proofs to resemble their on-paper counterparts. To this end, IPDL includes an equational logic to reason about approximate observational equivalence (i.e., computational indistinguishability) properties between protocols.
IPDL adopts a channel-centric core logic, which decomposes the behavior of the protocol into the behaviors along each communication channel. It supports straight-line programs with statically bounded loops.
The use of IPDL is demonstrated by a number of case studies, including a multi-use, secure message communication protocol, a multi-party coin toss with abort protocol, several oblivious transfer constructions, as well as the two- party GMW protocol for securely evaluating general circuits.
A mechanization of the IPDL proof system is provided and the case studies in Coq, and the code is open sourced.
1. Paper Title: A Security Framework for Distributed Ledgers.
Summary: The first framework for defining and analyzing the security of general distributed ledgers, with an ideal distributed ledger functionality.
1. Paper Title: Fast Validated Byzantine Broadcast.
Summary: A new broadcast formulation named partially synchronous validated Byzantine broadcast (psync-VBB) that solves a single-shot of BFT replication.
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