# Researchers describe RSA signature forgery method that reduces computing demands

_Published Thursday, September 24, 2026 at 9:07 AM EDT · Security, Science · Latest · Tier 1 — Major_

![A transparent digital chain breaking at its weakest point over a binary code background. — Primary](https://cdn.arstechnica.net/wp-content/uploads/2026/09/breaking-digital-chain-1152x648.jpg)

Researchers have devised a way to forge RSA digital signatures without first factoring the number underlying a private key, Ars Technica reported. The method substantially reduces the computing resources thought necessary to attack RSA keys, bringing an attack on deprecated 1024-bit keys closer to practical reach.

The finding remains subject to peer review. It poses little immediate practical threat: attacking even 1024-bit keys would still require exceptional resources, and widely used RSA implementations are safe, the report said. Its significance lies in challenging the assumption that producing a valid RSA signature requires recovering the private key first.

## Sources

- [Ars Technica](https://arstechnica.com/security/2026/09/theres-a-new-way-to-break-rsa-thats-faster-than-anything-weve-seen-before/)

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Canonical: https://techandbusiness.org/newswire/PV7C_zWZhhlcZ7zVdAiJN_
Published: 2026-09-24T13:07:39.337Z
Story chronology: 2026-09-24T11:15:44.000Z
Retrieved: 2026-09-24T15:09:02.230Z
Publisher: Tech & Business (techandbusiness.org)