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fix; add .travis.yml
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.gitignore
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.gitignore
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@ -1,3 +1,5 @@
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.vscode/
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## Core latex/pdflatex auxiliary files:
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*.aux
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*.lof
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0
.travis.yml
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.travis.yml
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@ -18,6 +18,9 @@
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## 分组密码概述
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#### Feistel 密码结构
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Feistel 结构是分组密码的一个通用结构。其加密算法的输入是长度为 2*w* 比特的明文分组及密钥 *K*。明文分组被分为两半:![L0][1] 和 ![R0][2]
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![](../pic/1.6.4_feistel.png)
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## 数据加密标准
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@ -48,3 +51,7 @@
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- [Data Encryption Standard](https://en.wikipedia.org/wiki/Data_Encryption_Standard)
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- [Advanced Encryption Standard](https://en.wikipedia.org/wiki/Advanced_Encryption_Standard)
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- [Block cipher mode of operation](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation)
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[1]: http://chart.apis.google.com/chart?cht=tx&chl=L_0
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[2]: http://chart.apis.google.com/chart?cht=tx&chl=R_0
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@ -18,6 +18,32 @@ Partial RELRO Canary found NX enabled No PIE No RPATH No RU
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```
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64 位程序,保护措施除了 PIE 都开启了。
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但其实这个程序并不能运行,它是一个线下赛的题目,会对做一些环境检查和处理,直接 nop 掉就好了:
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```
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| 0x004021ad bf18264000 mov edi, 0x402618
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| 0x004021b2 e87ceeffff call sym.background_process
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| 0x004021b7 bf39050000 mov edi, 0x539 ; 1337
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| 0x004021bc e85eefffff call sym.serve_forever
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| 0x004021c1 8945f8 mov dword [local_8h], eax
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| 0x004021c4 8b45f8 mov eax, dword [local_8h]
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| 0x004021c7 89c7 mov edi, eax
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| 0x004021c9 e8c6f0ffff call sym.set_io
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```
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```
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$ python2 -c 'print "90"*33' > nop.txt
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```
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```
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[0x00400ec0]> s 0x004021ad
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[0x004021ad]> cat ./nop.txt
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909090909090909090909090909090909090909090909090909090909090909090
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[0x004021ad]> wxf ./nop.txt
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```
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最后把它运行起来:
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```
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$ socat tcp4-listen:10001,reuseaddr,fork exec:"LD_PRELOAD=./libc.so.6 ./main.elf" &
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```
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## 题目解析
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玩一下,一看就是堆利用的题目:
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pic/1.6.4_feistel.png
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pic/1.6.4_feistel.png
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