攻防世界---Reversing-x64Elf-100

1.下载附件，先查壳，无壳

2.用IDA分析，找到main函数，使用fn+f5，反编译

3.分析代码

4.双击进入条件函数中查看代码

5.编写代码，来源：https://blog.csdn.net/2303_80796023/article/details/137086655?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522171324225816800213098524%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=171324225816800213098524&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduend~default-1-137086655-null-null.142^v100^pc_search_result_base5&utm_term=%E6%94%BB%E9%98%B2%E4%B8%96%E7%95%8CReversing-x64Elf-100&spm=1018.2226.3001.4187https://blog.csdn.net/2303_80796023/article/details/137086655?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522171324225816800213098524%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=171324225816800213098524&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduend~default-1-137086655-null-null.142^v100^pc_search_result_base5&utm_term=%E6%94%BB%E9%98%B2%E4%B8%96%E7%95%8CReversing-x64Elf-100&spm=1018.2226.3001.4187

#include<stdio.h>
int main() {
    char str1[] = "Dufhbmf";
    char str2[] = "pG`imos";     //拆成三个数组，str1，str2，str3
    char str3[] = "ewUglpt";
    char result;
    for (int i = 0; i <= 11; i++) {
        if (i % 3 == 0) {
            result = str1[2 * (i / 3)] - 1;
        }
        else if (i % 3 == 1) {
            result = str2[2 * (i / 3)] - 1;
        }
        else {
            result = str3[2 * (i / 3)] - 1;
        }
        printf("%c", result);
    }
    return 0;
}