| name | factordb |
| description | Auth/lab ref: public factorization database and simple JSON API for checking whether integers are prime, composite, or already factored. |
| compatibility | Web service with browser and JSON API access; internet required. |
| metadata | {"author":"AeonDave","version":"1.0"} |
FactorDB
The fastest factorization step is the one somebody else already paid for.
When to use FactorDB
Use FactorDB when you need to:
- check whether a modulus or large integer is already known and factored
- retrieve small-to-medium factors quickly before deeper math work
- decide whether RSA triage should move to
sagemath, rsactftool, or a different line of attack
Quick Start
curl "https://factordb.com/api?query=5959"
{"id":"5959","status":"FF","factors":[["59",1],["101",1]]}
Practical Workflow
- Query the target integer through the API or site.
- Inspect
status before trusting the result.
- If factors are returned, convert them into your local math workflow.
- If the number is still composite or partially factored, escalate to
sagemath, ECM, or a problem-specific attack.
Common Uses
- RSA modulus triage
p - 1 or q - 1 structure checks after recovering factors- sanity-checking challenge integers before local brute force
Practical Notes
FF means fully factored in the typical workflow; partially solved composites need follow-up.- FactorDB is a lookup service first, not a guaranteed live factorization oracle.
- Preserve source numbers exactly; dropped digits or formatting mistakes waste time and give false confidence.
Caveats
- Large unfactored composites may return incomplete results.
- Internet dependence makes it unsuitable for isolated environments.
- Treat it as a reconnaissance accelerator, not as the whole cryptanalysis plan.
Resources
No bundled scripts/, references/, or assets/.
Use the public API endpoint and site UI for current status and factor-list formatting.
