Directed Acyclic Graph (DAG) based Distributed Ledgers can be useful in a number of applications in the IoT domain. A distributed ledger should serve as an immutable and irreversible record of transactions, however, a DAG structure is a more complicated mathematical object than its blockchain counterparts, and as a result, providing guarantees of immutability and irreversibility is more involved. In this paper, we analyse a commonly discussed attack scenario known as a parasite chain attack for the IOTA Foundation DAG based ledger. We analyse the efficacy of IOTA core MCMC algorithm using a matrix model and present an extension which improves the ledger resistance to these attacks.
@article{arxiv.1904.00996,
title = {Distributed Ledger Technology for IoT: Parasite Chain Attacks},
author = {Andrew Cullen and Pietro Ferraro and Christopher King and Robert Shorten},
journal= {arXiv preprint arXiv:1904.00996},
year = {2020}
}