White Security

Daddy, teach me how to use random value in programming! ssh random@pwnable.kr -p2222 (pw:guest) C 언어의 랜덤함수에 관한 문제입니다.. #include int main(){ unsigned int random; random = rand(); // random value! unsigned int key=0; scanf("%d", &key); if( (key ^ random) == 0xdeadbeef ){ printf("Good!\n"); system("/bin/cat flag"); return 0; } printf("Wrong, maybe you should try 2^32 cases.\n"); return 0; } rand() ..

Mommy told me to make a passcode based login system. My initial C code was compiled without any error! Well, there was some compiler warning, but who cares about that? ssh passcode@pwnable.kr -p2222 (pw:guest) Toddler's Bottle 5번 문제입니다. c 언어로 작성한 로그인 프로그램에 문제가 있다고 하네요. #include #include void login(){ int passcode1; int passcode2; printf("enter passcode1 : "); scanf("%d", passcode1); fflush(stdin..