From Saweis · · 40s
RSA-896 Factored in 2026
Claude factored RSA-896 using 2048 GPUs in 10 days
In brief
Claude factored RSA-896 using 2048 GPUs in 10 days RSA-1024 keys vulnerable to GPU fleets Originally reported by Saweis.
Quick answers
- What is RSA-896?
- Stephen Weis factored RSA-896 with Claude on September 19, 2026
- How was it done?
- Claude ported CADO-NFS to run on GPUs for 2048 GPU fleet
- What did it show?
- RSA-1024 keys vulnerable to data center GPU fleets
- Why doesn't it matter?
- RSA-2048 keys remain secure despite the work
- What's next?
- More details on the computation and results to follow
What is RSA-896?
Stephen Weis factored RSA-896 with Claude on September 19, 2026
“RSA-896 is a RSA challenge number I factored with Claude on September 19, 2026”
How was it done?
Claude ported CADO-NFS to run on GPUs for 2048 GPU fleet
“Claude was used to port CADO-NFS to run on GPUs”
What did it show?
RSA-1024 keys vulnerable to data center GPU fleets
“It demonstrates that RSA-1024 keys are vulnerable to many actors with data center-level fleets of GPUs”
Why doesn't it matter?
RSA-2048 keys remain secure despite the work
“It does not impact the security of deployed RSA-2048 keys”
What's next?
More details on the computation and results to follow
“More details will follow”
The key point
RSA-1024 keys vulnerable to GPU fleets
