[ACTF2020 新生赛]BackupFile 1

鉴于提供的引用内容，\[ACTF2020 新生赛\]BackupFile 1是一道题目，它涉及到备份文件的寻找和查看。常见的备份文件包括“.git”、“.svn”、“.swp”、“.~”、“.bak”、“.bash_history”、“.bkf”。可以使用dirsearch工具进行目录扫描，找到备份文件的位置。然后访问该链接，下载文件并打开查看。在这个题目中，打开的是一个PHP文件，其中包含了一个弱类型比较的逻辑。通过让key=123进行访问，可以看到flag。\[1\] 源码中的逻辑是，如果存在$_GET\['key'\]，则将其赋值给$key。如果$key不是一个数字，则输出"Just num!"。然后将$key转化为整数，并与字符串$str进行比较。如果相等，则输出$flag。否则，输出"Try to find out source file!"。\[2\]\[3\] #### 引用[.reference_title] - *1* [[ACTF2020 新生赛]BackupFile 1](https://blog.csdn.net/qq_44122254/article/details/125927517)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^koosearch_v1,239^v3^insert_chatgpt"}} ] [.reference_item] - *2* [[ACTF2020 新生赛]BackupFile1](https://blog.csdn.net/m0_73728268/article/details/129497240)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^koosearch_v1,239^v3^insert_chatgpt"}} ] [.reference_item] - *3* [BUUCTF-[ACTF2020 新生赛]BackupFile1](https://blog.csdn.net/qq_46918279/article/details/120619373)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^koosearch_v1,239^v3^insert_chatgpt"}} ] [.reference_item] [ .reference_list ]