RSA-896

	RSA-896(saweis.net)
	225 points by madars 24 days ago \| 90 comments
	tl;dr: RSA-896 was factored on September 19, 2026 using Claude to port CADO-NFS to GPUs, orchestrating a fleet of up to 2048 GPUs running as low-priority idle-time jobs at Anthropic over 10 days (~30 GPU-years). The effort didn't improve GNFS runtime or threaten RSA-2048, but it demonstrates that RSA-1024 keys are now practically vulnerable to actors with data center–scale GPU resources.
	HN Discussion: ↑Points out real-world implications like Instagram's still-used 768-bit DKIM keys being trivially breakable now ↓Skeptical this reflects well on Anthropic given they had spare capacity for a non-novel achievement ↑Defends the effort as reasonable use of already-paid-for idle GPU capacity ~Downplays the AI angle, noting this is fundamentally a compute problem not an AI breakthrough •Suggests alternative fun uses for spare GPU cycles like hash collisions