64位程序,没有壳,拖进ida,关键信息如下
_int64 __fastcall not_the_flag(int a1) { if ( a1 == 42 ) puts("Cipher from Bill \nSubmit without any tags\n#kdudpeh"); else puts("YOUSUCK"); return 0LL; }
题目说到sha1,将kdudpeh,sha1加密得到flag