中国DOS联盟

Pengfei's code is amazing~~~ Top~

The method of file generation seems to be that first write the program, and then convert the hexadecimal data of the program into characters...

There is nothing mysterious about it.

An executable program is a binary file.

A text file is also a binary file.

Essentially, there is not much difference between them.

The particularity of the in.com program lies in that

All the code is entirely distributed within the range of displayable characters in the ASCII code table.

Of course, such a program is not obtained by chance.

But it is artificially constructed.

Many skills are needed in it.

For example, the most common interrupt call code int 21 (CD 21).

Because it is not within the range of displayable ASCII characters.

So many skills such as pushing onto the stack, popping from the stack, and increasing/decreasing code are used to construct it.

So its code segment changes dynamically.

------------------------------------------------------------

Such code is called ASCODE.

Such a technology is called ASCII Assemble.

A technology that is about to disappear.

It can be imagined that constructing such code is difficult.

Only a very small amount of ASCODE circulating on the Internet is artificially constructed.

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Because there are mature technologies that can convert any binary file into ASCODE.

Such a process is called encode.

And the execution process of ASCODE requires decode.

Collectively called codec.

--------------------------------------------------------------------

There are more than 4 known algorithms for codec.

The more famous one should be Herbert Kleebauer's algorithm.

But it requires that the original program must have a mark like org 170H.

Because the previous file header is used to store the decode code.

-------------------------------------

All this information can be found in usenet.

Of course, it can also be found in google group.

Visiting Herbert Kleebauer's homepage is also a good idea.

qzwqzw said, "Yes, haha~ The art of ASCODE is indeed... There are almost no places to use it except batch processing."

I'll go take a look, and if it's good, I'll give you a big thumbs up

Originally posted by electronixtar at 2007-1-17 11:46 AM:
What qzwqzw said is right, haha~ ASCODE art is indeed... there are almost no places to use it except batch processing

Seeing you speak makes my stomach hurt :D

Brother qzwqzw is really well-informed. It turns out it's ASCODE. To write such code, one needs to be proficient in binary machine language and then cleverly compile binary code that can be normally displayed in ASCII code form.

Reading such posts really broadens one's horizons, heh~

ASCODE is heard for the first time...

It's really powerful. Now I see there are many good things using ECHO XXXX >XXX.COM.

There are so many experts under DOS in Germany, like umbpci, hdcopy, doslfn. I look up to them......

@echo off

title 出现表示输入超时请按回车继续:

:begin

PING 127.0|set /p pwd=请输入密码:&cls>con

set /p pwd=

cls&echo 密码为:%pwd%

if "%pwd%"=="" cls&goto begin

pause>nul

```
@echo off
title 出现表示输入超时请按回车继续:
:begin
PING 127.0|set /p pwd=请输入密码:&cls>con
set /p pwd=
cls&echo 密码为:%pwd%
if "%pwd%"=="" cls&goto begin
pause>nul
```

After research, the above code can realize the hidden input of the password without generating temporary files. However, it will expose the un-entered password after exceeding the delay time. I hope experts can improve it!

It would be nice if 1 character entered shows 1 asterisk.