Crypto challenges for TJCTF 2023
baby-rsa
It seems that the ciphertext is comparitively way shorter than the modulus and since e is just 3, taking the 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}
ezdlp
Flag: tjctf{26104478854569770948763268629079094351020764258425704346666185171631094713742516526074910325202612575130356252792856014835908436517926646322189289728462011794148513926930343382081388714077889318297349665740061482743137948635476088264751212120906948450722431680198753238856720828205708702161666784517}