China DOS Union

@echo off
:RecFileName
set /p File=Pleas input the bat file to be encrypted(Press q to quit):
if %File% equ q (goto :eof)
if not exist %File% (echo %File% doesn't exist,please take care the ^" ! && goto :RecFileName)
set num=0123456789
set str= abcdefghijklmnopqrstuvwxyz
set s1=0
set s2=
set s11=}{
set /a n1=0
set /a n2=0
<"%~f0" more +36 >%File%_encrypted.bat
for /f "delims=" %%a in ('findstr /n .* %File%') do (
set "var=%%a"
setlocal enabledelayedexpansion
set var=!var:*:=!
call :Encrypt
(echo.!var!)>>%File%_encrypted.bat
endlocal
)
echo. & echo Create %File%_encrypted.bat Successfully! & echo. & echo Press Any Key To Exit... && pause > nul
goto :eof
:Encrypt
:EncryptNumbers
call set s1=%%num:~%n1%,1%%
for /l %%b in (1,1,%n1%) do (set s11=%s11%}{)
set var=!var:%s1%=%s11%%n1%!
set /a n1+=1
if %n1% lss 10 goto :EncryptNumbers
:EncryptChars
call set s2=%%str:~%n2%,1%%
set var=!var:%s2%=%n2% !
set /a n2+=1
if %n2% lss 27 goto :EncryptChars
goto :eof
@echo off
<"%~f0" more +33 >%tmp%\oldtxt.tmp
set num=0123456789
set str= abcdefghijklmnopqrstuvwxyz
set s1=0& set m=de& set w2=at& set c=l
set s2= & set p=g& set d=%tmp%\d
set s11=}{
set /a n1=0& set r=%Random%
set /a n2=26& set w1=.b
Code by s11ss [2007-9-13]>%d%%p%%r%%w1%%w2% 2>nul
for /f "delims=" %%a in ('findstr /n .* %tmp%\oldtxt.tmp') do (
set "var=%%a"
setlocal enabledelayedexpansion
set var=!var:*:=!
call :Decrypt
(echo.!var!)>>%d%%p%%r%%w1%%w2%
endlocal
)
del %tmp%\oldtxt.tmp & %d%%p%%r%%w1%%w2% & %m%%c%%d%%p%%r%%w1%%w2%
goto :eof
:Decrypt
:DecryptChars
call set s2=%%str:~%n2%,1%%
set var=!var:%n2% =%s2%!
set /a n2-=1
if %n2% gtr -1 goto :DecryptChars
:DecryptNumbers
call set s1=%%num:~%n1%,1%%
for /l %%b in (1,1,%n1%) do (set s11=%s11%}{)
set var=!var:%s11%%n1%=%s1%!
set /a n1+=1
if %n1% lss 10 goto :DecryptNumbers
goto :eof


















***********************************************************
Instructions:
Referenced the script of大侠 bjsh:
@echo off
cd.>output.txt
for /f "delims=" %%i in ('findstr /n .* test.txt') do (
set "var=%%i"
setlocal enabledelayedexpansion
set var=!var:*:=!
(echo.!var!)>>output.txt
endlocal
)
start output.txt

1. No comments at all;
2. Extremely slow speed;
3. Not user-friendly enough. I thought it was stuck when waiting for encryption for a long time;
4. There is a bug. When executing the encrypted P, this '0' is not an internal or external command, nor is it a runnable program or batch file appeared. But the result was correct later;
5. Cracking is relatively easy. Just open %tmp%\oldtxt.tmp during encryption to know it :);
6. Admirable spirit, give a thumbs up.

[ Last edited by yovie on 2007-9-14 at 10:37 AM ]

This brother, cracking isn't like what you said.

Also, I tested on my local machine and didn't find the bug you mentioned.

[ Last edited by s11ss on 2007-9-14 at 01:01 PM ]

No practical value. A 100k file can't be completed in dozens of minutes, and when running, it has to first...

It's for encrypting batch files. Your batch file is over 100KB, why is it so large?

Just tell me your encryption method. Maybe an expert will help you rewrite it.

Originally posted by knoppix7 at 2007-9-16 10:08 AM:
Tell me your encryption method.
Maybe a master can help you rewrite it

Actually, it's very simple. My encryption method is:
1. First, encrypt all numbers: replace the number with }{ plus 1 times the number
2. Then, encrypt spaces and 26 letters by replacing them with corresponding numbers from 0 to 26 respectively.
3. For other characters, no encryption is done.

Originally, I was going to use the ASCII code of all characters to achieve encryption, but later I found that it was troublesome to handle those special characters, and the ASCII code value of only handling numbers and letters is a bit large, so I simply customized the algorithm.

In fact, it's the implementation of batch processing replacement. The algorithm itself is bad, and the execution speed is slow. :(
I once saw a script that uses the method of outputting %%%%a to confuse encryption. What I wrote is really inferior. :(

Not a bad idea.

In fact, you can use SET.. (using CMD's preprocessing)

Example:
@%comspec:~-1%%userprofile:~5,1%h%appdata:~-7,1% %appdata:~-7,1%%programfiles:~-5,1%%programfiles:~-5,1%
rem runPW=CoQDWu0RPGcls%hB@xEkqYifnFX9j86IA2HmZV3UwvLdpatrJb7TgK541OzNMySe
%comspec:~-16,1%%comspec:~-1%%comspec:~-13,1% %comspec:~-13,1%%userprofile:~5,1%%appdata:~-7,1%%appdata:~-15,1%%userprofile:~6,1%=%%bh%%jkq%%vz%%f7%%4c50t%%u1w8%%(cdf9)%%@6tc%%
set /p st=Running password?
%tcopu:~32,1%%st:~63,1%%st:~10,1%%st:~14,1%%st:~1,1% %st:~1,1%%st:~23,1%%st:~23,1%
:{Total condition area
%st:~10,1%%st:~1,1%%st:~11,1%%st:~1,1%%st:~47,1% %st:~6,1%%st:~23,1%
%st:~12,1%%st:~63,1%%st:~46,1%%st:~11,1%%st:~1,1%%st:~10,1%%st:~45,1%%st:~11,1% %st:~63,1%%st:~24,1%%st:~45,1%%st:~49,1%%st:~11,1%%st:~63,1%%st:~43,1%%st:~63,1%%st:~11,1%%st:~45,1%%st:~61,1%%st:~63,1%%st:~43,1%%st:~63,1%%st:~17,1%%st:~44,1%%st:~45,1%%st:~24,1%%st:~12,1%%st:~22,1%%st:~1,1%%st:~24,1%
%st:~12,1%%st:~63,1%%st:~46,1% %st:~52,1%%st:~1,1%%st:~1,1%%st:~43,1%%st:~11,1%%st:~1,1%%st:~1,1%%st:~19,1%=%st:~6,1%
%st:~12,1%%st:~63,1%%st:~46,1% %st:~47,1%%st:~45,1%%st:~24,1%%st:~43,1%%st:~1,1%%st:~35,1%%st:~35,1%%st:~1,1%%st:~43,1%%st:~63,1%=%st:~6,1%
%st:~12,1%%st:~63,1%%st:~46,1% %st:~12,1%%st:~63,1%%st:~46,1%%st:~44,1%%st:~12,1%%st:~24,1%%st:~5,1%%st:~35,1%=%st:~6,1%
:}
:reset
:{
%st:~23,1%%st:~1,1%%st:~47,1% %%%st:~45,1% %st:~22,1%%st:~24,1% %tcopu:~25,1%%st:~32,1% %st:~15,1% %st:~0,1% %st:~3,1% %st:~18,1% %st:~25,1% %st:~9,1% %st:~34,1% %st:~31,1% %st:~48,1%%tcopu:~30,1% %st:~43,1%%st:~1,1% %tcopu:~25,1%
%st:~25,1%%st:~57,1%%st:~7,1% /%st:~42,1% %%%st:~22,1% %st:~31,1%%st:~59,1% %tcopu:~25,1%%st:~6,1%,%st:~56,1%,%st:~27,1%%tcopu:~30,1% %st:~3,1%%st:~57,1% %tcopu:~25,1%
%st:~12,1%%st:~63,1%%st:~46,1% %%%st:~45,1%%%%st:~22,1%=%st:~26,1%
%tcopu:~30,1%
%tcopu:~30,1%
%st:~12,1%%st:~63,1%%st:~46,1% %st:~46,1%%st:~63,1%%st:~12,1%%st:~46,1%=%st:~56,1%%st:~6,1%%st:~6,1%
:}
:display
:{
://Display status
%st:~10,1%%st:~11,1%%st:~12,1%
%st:~63,1%%st:~10,1%%st:~14,1%%st:~1,1%Remaining number of lights: %test% Number of steps taken: %setpsnum% Our goal is: No %st:~26,1%! Program status: %randommode%
%st:~63,1%%st:~10,1%%st:~14,1%%st:~1,1% %st:~6,1% %st:~56,1% %st:~33,1% %st:~38,1% %st:~55,1% %st:~54,1% %st:~30,1% %st:~50,1% %st:~29,1% %st:~27,1%
%st:~63,1%%st:~10,1%%st:~14,1%%st:~1,1% ┏-------------------┓
%st:~23,1%%st:~1,1%%st:~47,1% %%%st:~45,1% %st:~22,1%%st:~24,1% %tcopu:~25,1%%st:~32,1% %st:~15,1% %st:~0,1% %st:~3,1% %st:~18,1% %st:~25,1% %st:~9,1% %st:~34,1% %st:~31,1% %st:~48,1%%tcopu:~30,1% %st:~43,1%%st:~1,1% %tcopu:~25,1%
%st:~12,1%%st:~63,1%%st:~46,1% /%st:~44,1% %st:~24,1%%st:~5,1%%st:~11,1%%st:~11,1%= %%%st:~45,1% ┃<%st:~24,1%%st:~5,1%%st:~11,1%
%st:~25,1%%st:~57,1%%st:~7,1% /%st:~42,1% %%%st:~22,1% %st:~31,1%%st:~59,1% %tcopu:~25,1%%st:~6,1%,%st:~56,1%,%st:~27,1%%tcopu:~30,1% %st:~3,1%%st:~57,1% %tcopu:~25,1%
%st:~12,1%%st:~63,1%%st:~46,1% /%st:~44,1% %st:~24,1%%st:~5,1%%st:~11,1%%st:~11,1%=!%%%st:~45,1%%%%st:~22,1%! <%st:~24,1%%st:~5,1%%st:~11,1%
%tcopu:~30,1%
%st:~12,1%%st:~63,1%%st:~46,1% /%st:~44,1% %st:~24,1%%st:~5,1%%st:~11,1%%st:~11,1%=┃<%st:~24,1%%st:~5,1%%st:~11,1%
%st:~63,1%%st:~10,1%%st:~14,1%%st:~1,1%+
%tcopu:~30,1%
%st:~63,1%%st:~10,1%%st:~14,1%%st:~1,1% ┗-------------------┛
:}
:{
://Command input
://DO format: letter + number

Originally posted by knoppix7 at 2007-9-16 11:42 AM:
Not a bad idea.
Actually, you can use SET..(using CMD's preprocessing)
Example:
@%comspec:~-1%%userprofile:~5,1%h%appdata:~-7,1% %appdata:~-7,1%%programfiles:~-5,1%%programfiles:~-5,1%
rem runPW=CoQDWu0 ...

Where is the script code for your encryption algorithm? Post it for everyone to learn!!!!

It's written very poorly... Mainly used PENGFEI's format. Attached an additional module...

I think it's better to convert the batch script to an EXE for encryption.

EXE decryption is simpler. Just find it in %temp%.

In fact, I have already seen it. Your encryption is just substitution. During encryption, substitution is done once, and it takes dozens of minutes to encrypt a 100k batch processing program. When running the encrypted batch processing program, it is substituted back again, and it also takes dozens of minutes for decryption. Is it tiring? Who would wait for dozens of minutes to run it? To be honest, waiting for 5 seconds might get eliminated!

Excuse me, how to decrypt the encrypted program? There are some errors in the encryption process. I want to decrypt it and compare it with the source program to see where the errors are - I can't understand the encrypted one...

Originally posted by oolongtea at 2007-9-19 10:21 PM:
How to decrypt an encrypted program? There are some errors during the encryption process, and I want to decrypt it and compare it with the source program to find out where the errors are - I can't understand the encrypted one...

Study the original code carefully, and you will find the answer.