pHBP018DCCh/KTe6Psz1/g== 这是什么加密

区块 #320142
2,083. BTC
预计交易量
1,047. BTC
0.0407802 BTC
27,428,630,902.26
192.605 KB
新区块奖励
二进制哈希树根
b05e19f992c0e545a4c8f79d0aef0cc6e7f447b72
赞助商链接
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2017 Blockchain Luxembourg S.A. All Rights Reserved.ISCC2015解题writeup - 推酷
ISCC2015解题writeup
iscc比赛时间跨度很长,比赛时间过去一半了才知道,不过有很多题目都很简单,而且有足够的时间慢慢琢磨,总之还算是一次不错的ctf体验。下面是解题writeup,第一次参加个人赛还是有很多不会的&&
送分题不多说了,flag :anthony
pHBP018DCCh/KTe6Psz1/g==
Lo1tv5ESqHnUzrFUA9EKeA==
pHV9dBn/O0jpLpBZbw51SA==
Ypm6LL2WYaXjhytxVSHNag==
mpftptifXJ6EVgRooGeXBw==
Google搜这几个字符串,分别发现在
有对应的解密数据,原来是对某字符串hash完取base64
得到&The&death&god&only&eat
再Google搜这句话发现The&death&god&only&eat&apples,所以答案就是apples
破解docx密码,暴力跑一下即可
直接可以搜到源题。。。
/view/0fca300a6c3906c.html
Flag:overthehillx
用密钥0x42异或解密这段shellcode,然后放在windows下跑即可弹出flag:
#include &stdlib.h&
#include &stdio.h&
const unsigned char code2[] =
&\xfc\x68\x6a\xa\x38\x1e\x68\x63\x89\xd1\x4f\x68\x32\x74\x91\x0c\x8b\xf4\x8d\x7e\xf4\x33&
&\xdb\xb7\x4\x2b\xe3\x66\xbb\x33\x32\x53\x68\x75\x73\x65\x72\x54\x33\xd2\x64\x8b\x5a\x30&
&\x8b\x4b\xc\x8b\x49\x1c\x8b\x9\x8b\x69\x08\xad\x3d\x6a\x0a\x38\x1e\x75\x05\x95\xff\x57\xf8&
&\x95\x60\x8b\x45\x3c\x8b\x4c\x05\x78\x03\xcd\x8b\x59\x20\x03\xdd\x33\xff\x47\x8b\x34\xbb&
&\x3\xf5\x99\xf\xbe\x6\x3a\xc4\x74\x8\xc1\xca\x7\x3\xd0\x46\xeb\xf1\x3b\x54\x24\x1c\x75\xe4&
&\x8b\x59\x24\x3\xdd\x66\x8b\x3c\x7b\x8b\x59\x1c\x3\xdd\x3\x2c\xbb\x95\x5f\xab\x57\x61\x3d&
&\x6a\xa\x38\x1e\x75\xa9\x33\xdb\x53\x68\x77\x76\x74\x26\x68\x56\x6b\x2a\x38\x8b\xc4\x53\x50&
&\x50\x53\xff\x57\xfc\x53\xff\x57\xf8\x90\x90\x90\x90&;
int main(int argc, char **argv)
lea eax,code2
}//用内嵌汇编的方式来执行shellcode
读php代码可知,遍历所以四位数既能得到flag,得到flag&Key:YeahYourMind
sql:”select&*&from&admin_password&where&password='”.md5($password,true).”‘”
该Sql语句中有一个raw&input的漏洞,md5($password,true)函数 返回计算password的md5值后的二进制流,然后与前面的select…拼接在一起,所以要使得这个二进制流所对应的字符为’or&之类的的即可,最主要的是找这样的hash值,网上居然搜到了http://blog.csdn.net/greyfreedom/article/details/。得到&flag:{45dcbc39e5596ffbb0d09dd3e2bde0fa}
这题是cookie注入,在访问请求中添加cookie:cmd=ls &即会返回目录下的文件名,然后直接访问那个比较特殊的文件既能得到flag。
用od插件过掉seh反调试,然后在seh链上下断点,再在输入字符串的内存缓冲区起始地址下内存访问断点,几次之后就会到真正的比较代码:
其实就是把字符串转int,初始int值存在栈中,得到
修复一下apk即可,具体见:CTF Android逆向题
这题是webview漏洞的题,先用以下代码检测app是否存在webview漏洞:
&!DOCTYPE html&
&meta charset=&UTF-8& /&
&title&WebView 漏洞检测&/title&
&meta name=&viewport& content=&width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0&&
&b&如果当前 app 存在漏洞,将会在页面中输出存在漏洞的接口方便程序员做出修改:&/b&
&script type=&text/javascript&&
function check()
for (var obj in window)
if (&getClass& in window[obj]) {
window[obj].getClass();
document.write('&span style=&color:red&&'+obj+'&/span&');
document.write('&br /&');
}catch(e){
} catch(e) {
} check();
发现漏洞接口为youLucky,于是要猜测java层对应的代码函数名,各种猜测无果后偶然发现小三大大写过脱爱加密的教程,跟着教程走一遍很快就脱出来了。脱完之后知道java层的接口是showT,js中调用window.youLucky.showT()即可得到flag:
一开始以为是简单的算法,注入之后获取getkey的返回值:wo&jiu&shi
静态逆出答案bei&pian&la&ha&ha,一看就知道是假的&—&—!!!
然后动态跟了下发现根本没有进入getString2这个函数,但是又能有返回值,想想也知道肯定是在so里面做了java&hook,把libxxx.so拖进ida,发现几个比较可疑的函数,然后动态调时在那几个函数上下断点,果然断下来了!接下来就是逆算法了。
可疑函数:
动态跟踪发现下面这张表格就确定是使用AES算法了:
通过跟踪调试发现加密密钥(16bytes):0x49,0xBC,0x02,0x4B,0x28,0x13,0x1B,0x25,0x0B,0x1D,0x58,0x1C,0x2C,0x01,0x03,0x63
正确的加密结果为(32字节A300fb47d20c535cef8cbee5…):
网上找了一段AES加解密的代码得到flag:qin,bu&cuo&o!^o^
给了一个伪加密的zip包,用python解压出一个arm下的elf文件
import argparse
from zipfile import ZipFile, ZipInfo
class ApkFile(ZipFile):
def extract(self, member, path=None, pwd=None):
if not isinstance(member, ZipInfo):
member = self.getinfo(member)
member.flag_bits ^= member.flag_bits%2
ZipFile.extract(self, member, path, pwd)
print 'extracting %s' % member.filename
def extractall(self, path=None, members=None, pwd=None):
map(lambda entry: self.extract(entry, path, pwd), members if members is not None
and len(members)&0 else self.filelist)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='unpacks an APK that contains files which are wrongly marked as encrypted')
parser.add_argument('apk', type=str)
parser.add_argument('file', type=str, nargs='*')
args = parser.parse_args()
apk = ApkFile(args.apk,'r')
apk.extractall(members=args.file)
解压出来是一个arm下的elf,运行后输出一段看似错误代码的代码,其实是一段正常的java代码,重定向到文件后运行得到flag。
用wireshake搜关键字:
http contains &zip&
在数据包中找到一个加密的zip:
用ziperello暴力破解得到密钥为havefun,解开得到一个txt,里面存着flag:
flag{ce8c136df237e86bb7a553347f}
用010deitor查看图片,发现每一行中不同像素点在rbg某个通道中会有不同的值(每一行中只有一个通道有问题)正常情况下每一行的像素值应该都相同,所以判断这里肯定有问题:
于是用python写了一段脚本扣出每一行中有问题的像素点(像素的值为n或者n+1,将值为n的点看成0,n+1的点看成1)脚本如下:
from PIL import Image
def getflag(filename):
out = open(&/tmp/result.txt&,&w+&)
bmp = Image.open(filename)
pix = bmp.load()
w,h = bmp.size
for i in xrange(0,h):
r,g,b = pix[0,i]
base = [r,g,b]
for k in xrange(1,w):
r,g,b = pix[k,i]
print i,r,g,b
if r!=base[0]:
if r&base[0]:
big = base[0]
if g!=base[1]:
if g&base[1]:
big = base[1]
if b!=base[2]:
if b&base[2]:
big = base[2]
print &flag ---& &,flag,r,g,b
if flag == 0:
for j in xrange(0,w):
r,g,b = pix[j,i]
if r == big:
bits.append(&1&)
bits.append(&0&)
if flag == 1:
for j in xrange(0,w):
r,g,b = pix[j,i]
if g == big:
bits.append(&1&)
bits.append(&0&)
if flag == 2:
for j in xrange(0,w):
r,g,b = pix[j,i]
if b == big:
bits.append(&1&)
bits.append(&0&)
bits = &&.join(bits)
print bits
for i in xrange(0,len(bits),8):
ch.append(chr(int(bits[i:i+8],2)))
ch = &&.join(ch)
#print ccr
out.write(ch)
&__main__& :
getflag(&/tmp/isccfinal.bmp&)
跑完之后得到一个加密的zip,在zip末尾发现782ppp2o0r068q7s,再用rot13转换一下,就得到解压密钥,解压后得到flag:{40aefb4f574c5d0cf219a}
010editor打开发现像一个gif图
在末尾看到&PNG_is_Not_Gif&&所以将头部改成PNG得到一张图片:
但是上面的字符仍然不是flag,应该是藏在图片里了,用binwalk查看发现隐藏了两个zlib,用命令binwalk&-e&iscc
可以解压出两个zlib格式的文件:
然后用python解压
import zlib
f = open(&/tmp/1/1E5644.zlib&)
uc = zlib.decompress(f.read())
得到flag{PNG_IDAT_LZ777_justforfun}
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与原文不一致pHBP018DCCh/KTe6Psz1/g==
Lo1tv5ESqHnUzrFUA9EKeA==
pHV9dBn/O0jpLpBZbw51SA==
Ypm6LL2WYaXjhytxVSHNag==
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这是md5解密,解密结果是The death god only eat,然后提交,呃。。。wrong answer!
百度一下。。。
找到这个。
那就试试apples吧,竟然对了。
好吧,算我孤陋寡闻了,竟然不知道这是什么东西。
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