Ancient Warfare

Do you know how people from Caeser's time used to send encrypted messages?

Try to get the flag : funxgvpgs{byq3e_1f_a0g_nyj4lf_gu3_o3gg3e!}

Caser's cipher with key of 13

Flag : shaktictf{old3r_1s_n0t_alw4ys_th3_b3tt3r!}