It seems that the ciphertext is comparitively way shorter than the modulus and since e is just 3, taking the [cube root](https://www.dcode.fr/cube-root) of the ciphertext gives the message since the modulus is useless: `m^e mod n = c => m^e = c`



Flag: `tjctf{thr33s_4r3_s0_fun_fb23d5ed}`

Original writeup (https://jpalayoor.com/cryptography/TJCTF-2023.html#baby-rsa).