# RSA — Low Exponent (CTF challenge)

> The flag was encrypted with textbook RSA using a very small public exponent (e=3) and no padding. Don't try to factor n — there's an easier way when the message is small. Recover the flag.

Canonical: https://codelivly.com/ctf/challenges/crypto-rsa-low-exponent

| | |
|---|---|
| Category | Cryptography |
| Difficulty | Medium |
| Points | 400 |
| Estimated time | 20 min |
| Type | Live instance |
| Solves | 35 |
| Author | Codelivly |

The flag was encrypted with textbook RSA using a very small public exponent (e=3) and no padding. Don't try to factor n — there's an easier way when the message is small. Recover the flag.

## Related

- [All CTF challenges](https://codelivly.com/practice?type=ctf)