Crackulus lets you experiment with RSA: supply primes p and q, pick a public exponent, then watch the tool derive keys, encrypt your message, and verify the round-trip decryption.

Prime p

Accepts decimal or prefixed hex (e.g. 0x13). Please use reasonably sized primes.

Prime q

Public exponent e

Message

We convert the message to a big integer using UTF-8 bytes. Keep it shorter than n.

Results