首先进行查壳,没有壳. 随便输入,看程序执行信息.随意输入字符串,提示key error 放到IDA中打开,在左侧函数窗口中找到main0,F5反编译,进行分析.具体已在分析在图中标识. 关于main函数的逻辑是很容易理解的,但是接下来可就犯难了.我首先是打开45C748(对Str进行变换的函数).如下图,看起来应该是在进行对Str变换之前,做一些初始化工作. 整个过程不难理解,但当我打开45DCD3函数时,就一头雾水了. 这没得分析(后来才知道是VM处理过的),于是打开OD输入01234567…

Take The Maze 首先拿进PEID里查一下有没有壳: 无壳,果断拖进IDA.可是Graph View中找不到主程序的位置,在函数表里寻找主函数: 函数太多阻扰了我们找到主程序,运行一下程序找一些关键词来搜索主程序位置: 得知主程序中应当含有“welcome to zsctf!”字符串,在IDA中搜索来找到主程序: 成功找到主函数,双击进入主函数,F5出伪代码: 可以看出输入的KEY为24位由0-9,a-f构成的字符串,且需要根据sub_45E593()的返回值确定是否为正确KEY.其他…

看到如果判断正确之后 会生成一个png文件 直接用idc脚本生成: auto v,begin,end,dexbyte; v = fopen("flag.png", "wb"); begin = 0x005409C0; end = begin + 0x78A; for ( dexbyte = begin; dexbyte < end;dexbyte ++ ) {fputc(Byte(dexbyte), v);} fclose(v); 注意这里我用的fputc 一…

Sept. 10, 2015 Study again the back tracking algorithm using recursive solution, rat in maze, a classical problem. Made a few of mistakes through the practice, one is how to use two dimension array, another one is that "not all return path returns va…

http://www.lightoj.com/volume_showproblem.php?problem=1027 You are in a maze; seeing n doors in front of you in beginning. You can choose any door you like. The probability for choosing a door is equal for all doors. If you choose the ith door, it ca…

1204.   Maze Traversal A common problem in artificial intelligence is negotiation of a maze. A maze has corridors and walls. The robot can proceed along corridors, but cannot go through walls. Input For this problem, you will input the dimensions of…

/*这道题我原本是将斜线迷宫扩大为原来的两倍,但是在这种情况下对于在斜的方向上的搜索会变的较容易出错,所以参考了别人的思路后将迷宫扩展为原来的3倍,这样就变成一般的迷宫问题了*/ #include"iostream" #include"stdio.h" #include"algorithm" #include"cmath" #include"string.h" #include"ctype.h&q…

Zhuge Liang's Stone Sentinel Maze Time Limit: 10000/4000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 385    Accepted Submission(s): 106 Problem Description Zhuge Liang was a chancellor of the state of Shu Han dur…

Borg Maze Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9220   Accepted: 3087 Description The Borg is an immensely powerful race of enhanced humanoids from the delta quadrant of the galaxy. The Borg collective is the term used to descr…

Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9718   Accepted: 3263 Description The Borg is an immensely powerful race of enhanced humanoids from the delta quadrant of the galaxy. The Borg collective is the term used to describe the gr…