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📄 dsa算法的理论，实现，以及在破解中的应用2.htm

📁 dsa加密算法
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  </TD></TR></TBODY></TABLE><BR></DIV><B>原有信息:</B><BR><FONT color=blue>序 
号:</FONT>269525<BR><FONT color=blue>标 题:</FONT>(二) (13千字)<BR><FONT 
color=blue>发信人:</FONT>娃娃[CCG]<BR><FONT color=blue>时 间:</FONT>2003-8-12 
12:27:53<BR><FONT color=blue>阅读次数:</FONT>276<BR><FONT 
color=blue>详细信息:</FONT><BR>
<BLOCKQUOTE>[第二部分： 签名篇] <BR><BR>&nbsp; &nbsp; 介绍完理论之后 我们来实践了解一下： <BR>&nbsp; 
  &nbsp; 目标： pDriLl's Crypto KeygenMe #4 <BR>&nbsp; &nbsp; 主要工具： 
  C32Asm(感谢pll621/CCG 送给我Keyfile); Ollydbg1.09d; <BR>&nbsp; &nbsp; &nbsp; &nbsp; 
  &nbsp; &nbsp; &nbsp; BigInt Calc Pro 1.2(感谢Stkman/CCG 送给我Keyfile) <BR>&nbsp; 
  &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 等等.... <BR><BR>&nbsp; &nbsp; 
  先脱壳：用CoolDumper找到OEP是407952 然后使用 ImportREC1.6f 修复IAT表。 <BR>&nbsp; &nbsp; 
  用Ollydbg载入程序 下断点 BPX GetDigItem 断下后走到不远处： <BR><BR>004012A6&nbsp; . LEA 
  EBX,DWORD PTR SS:[EBP-104] <BR>004012AC&nbsp; . MOV DWORD PTR DS:[EBX],EAX 
  <BR>004012AE&nbsp; . POP EBX <BR>004012AF&nbsp; . CMP DWORD PTR 
  SS:[EBP-1D0],0&nbsp; // 该不会连名字都不输入吧 <BR>004012B6&nbsp; . JNZ SHORT 
  Dumped4W.004012DE&nbsp; <BR>004012B8&nbsp; . PUSH 0 <BR>004012BA&nbsp; . LEA 
  EAX,DWORD PTR SS:[EBP-3C] <BR>004012C0&nbsp; . PUSH EAX <BR>004012C1&nbsp; . 
  LEA EAX,DWORD PTR SS:[EBP-20] <BR>004012C7&nbsp; . PUSH EAX <BR>004012C8&nbsp; 
  . LEA EAX,DWORD PTR SS:[EBP+8] <BR>004012CE&nbsp; . MOV EAX,DWORD PTR DS:[EAX] 
  <BR>004012D0&nbsp; . PUSH EAX <BR>004012D1&nbsp; . LEA EAX,DWORD PTR 
  DS:[4017BD] <BR>004012D7&nbsp; . PUSH EAX <BR>004012D8&nbsp; .-JMP DWORD PTR 
  DS:[40E9A4]&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;&nbsp; 
  user32.MessageBoxA <BR>004012DE&nbsp; &nbsp; LEA EAX,DWORD PTR SS:[EBP-22C] 
  <BR>004012E4&nbsp; . PUSH EAX <BR>004012E5&nbsp; . CALL 
  Dumped4W.00401900&nbsp; // 过了这个CALL， DB EAX 就看到： <BR><BR>0012F878&nbsp; 01 23 
  45 67 89 AB CD EF FE DC BA 98 76 54 32 10&nbsp; #Eg壂惋

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