buuctf

解压用ida打开第一个xor文件(因为第二个我打不开),
找到main函数

可见是对global字符串从第二位开始与前一位异或直到最后一位,找到global字符串并按步骤反过来就可以了,

#include
int main(){
	int ch[34]={0x66,0x0A,0x6B,0x0C,0x77,0x26,0x4F,0x2E,0x40,0x11,0x78,0x0D,0x5A,0x3B,0x55,0x11,0x70,0x19,0x46,0x1F,0x76,0x22,0x4D,0x23,0x44,0x0E,0x67,0x06,0x68,0x0F,0x47,0x32,0x4F,0x00};
	for(int i=33;i>0;i--){
		ch[i]^=ch[i-1];
	}
	for(int i=0;i<34;i++)
	printf("%c",ch[i]);
	return 0;
}

得到flag.