---
id: 1532
title: "Breaking the shared key in threshold signature schemes"
source_domain: blog.trailofbits.com
source_url: "https://blog.trailofbits.com/2024/02/20/breaking-the-shared-key-in-threshold-signature-schemes/"
published_at: "2024-02-20T14:30:37Z"
tags: ["denial-of-service", "cryptography", "vulnerability-disclosure", "threshold-signatures", "mpc", "dkg", "frost"]
phying_url: "https://phying.com/item/1532"
lang: en
---

# Breaking the shared key in threshold signature schemes

## Summary

Trail of Bits discloses a DoS flaw in Pedersen DKG of threshold signature schemes (Frost, DMZ21, GG20, GG18): a malicious participant can silently raise the shared-key reconstruction threshold.

## Intelligence Metadata

- **Sources:** blog.trailofbits.com
- **Published:** 2024-02-20T14:30:37Z
- **Original:** https://blog.trailofbits.com/2024/02/20/breaking-the-shared-key-in-threshold-signature-schemes/
- **Phying News:** https://phying.com/item/1532