# Factoring Quest: RSA Numbers — Hunt the Primes Behind RSA

> Hunt the Primes Behind RSA (iPhone/iPad app by Erdener Uyan.)

- Source: https://appshunter.io/ios/app/factoring-quest-rsa-numbers/id6809395954 (this page in markdown: same URL + `.md`)
- Developer: [Erdener Uyan](https://appshunter.io/developer/1843571074)
- Category: Education, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 18.0 · 5 MB
- Languages: American English
- Released: 2026-09-30
- Data updated: 2026-10-07

## What is Factoring Quest?

Attack a number nobody has ever factored.

In 1991, RSA Laboratories published a list of enormous numbers, each the product of two secret primes. Split one back into its two primes and you break the math that RSA encryption relies on. Some fell after years of supercomputer work. Many have never been factored by anyone.

Factoring Quest puts every one of them in your pocket and lets your iPhone or iPad take a real swing.

EVERY RSA CHALLENGE NUMBER
• All 54 official moduli, from RSA-100 to RSA-2048, on one interactive globe
• Solved targets show when they fell and where their prime sat
• The list updates itself when a new factorization is verified, no app update needed

REAL WORK, NOT A SIMULATION
• Every attempt is a genuine division against the official number
• Candidates come from the exact range where the smaller prime must lie: above its bit floor and below the square root of N
• A small-prime sieve discards obvious misses before the expensive big-number math
• Run a single try, or go continuous and test millions of candidates per second

LIVE STATISTICS
• Candidates tested, speed per second and sieve pass rate
• Lifetime totals saved for every target
• An honest chance-to-find that shows exactly how small the odds are

TEST YOUR OWN PRIME
Have a favorite prime? Enter it and see its remainder against any RSA number. A remainder of zero would crack the challenge.

LEARN AS YOU GO
Every technical term, from bit width to N mod p, explains itself with a tap. No math degree required.

STRAIGHT TALK
Random trial division will not break a modern RSA number, and the app never pretends otherwise. Factoring Quest lets you feel first-hand why RSA encryption works: multiplying two primes takes microseconds, while splitting the product back apart can take thousands of years of computing time. RSA Laboratories ended the challenge in 2007, so no prize is available.

COMPLETELY FREE
• No ads, no in-app purchases, no account
• Your statistics stay on your device
• Light and dark themes
• Made for iPhone and iPad

Pick a target. Press go.

## Is Factoring Quest safe?

Not enough ratings yet to assess Factoring Quest.

## Is Factoring Quest legit?

Factoring Quest: RSA Numbers appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Factoring Quest is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-09-30

No release notes.

## More apps by Erdener Uyan

- [Bitcoin Puzzle Quest](https://appshunter.io/ios/app/bitcoin-puzzle-quest/id6744828717)
- [Summit Numbers](https://appshunter.io/ios/app/summit-numbers/id6753334821)
- [Entropy: Zero](https://appshunter.io/ios/app/entropy-zero/id6757635585)
- [Der Wortschatz](https://appshunter.io/ios/app/der-wortschatz/id6758740763)
- [Zweitwohnung](https://appshunter.io/ios/app/zweitwohnung/id6796437637)
- [The World of Words](https://appshunter.io/ios/app/the-world-of-words/id6796671627)

All apps by Erdener Uyan: https://appshunter.io/developer/1843571074

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-07.*