23 replies to this topic

[steve8tch]

I know there have been many topics covering encryption - but most talk about encrpting string values. What I would like to see added to Aut3 is some basic encryption of files - just to prevent things like text files being viewed as straight text.

I was thinking that the fuctionality would be added as follows :-

FileOpen("filename",Mode,[password]) There would have to be 3 more "Mode values"
Mode 3 - Open Encrypted file for reading.
Mode 4 - Open/Create Encrypted file for writing.
Mode 5 - Open/Overwrite Encrypted file for writing.

I was not thinking some super delux 256 bit key pair here - for that we could file install an encrytion program and encrypt a File - but just enough to prevent casual viewing and a little bit of hacking.

Any thoughts....

[Insolence]

Sounds like something a UDF would be good for

[b14ck]

Maybe build in an md5 that can accept files, strings, or whatever else. Just overload it a lot

[Insolence]

It seems you've been away a while Black, where were ya? (not being rude)

Sven, which has been doing a lot of great work lately, made a MD5 function in AutoIt. Think that'll work?

http://www.autoitscript.com/forum/index.php?showtopic=10590

[MSLx Fanboy]

You can't decrypt an MD5 however. Why not just FileReadLine() and then _StringEncrypt()? That's a basic encryption, just create a function file to include, so that _FileEncrypt("somefile.txt", "password") will do that...

Some Psuedocode:

Func _FileEncrypt($filename, $passkey, $outfilename)

$infile = FileOpen($filename, r)
$outfile = FileOpen($outfilename, w)
While Not EOF
$text = FileReadLine($infile)
$entext = _StringEncrypt(1, $text, $passkey)

FileWrite($outfile, $entext)
WEnd
FileClose($infile)
FileClose($outfile)
EndFunc

Then just decrypt it to a string...


EndFunc

[JSThePatriot]

I just created an encryption function of my own. It is a one way (it could be undone... but I didnt make the reverse as I dont want it reversed.) encryption, but very useful.

One other thing you might find useful is AxCrypt. Very good utility.
Link: AxCrypt Website

I hope that helps some. I will post my UDF in the Scripts and Scraps Forum.
JS

[Ejoc]

Microsoft has crypto functions that you can use via DllCall. I was looking it over and it can be done in autoit.

[layer]

Microsoft has crypto functions that you can use via DllCall.  I was looking it over and it can be done in autoit.

<{POST_SNAPBACK}>

Yea, I've seen those too They're called "FileEncrypt" ? Something simple like that, or vice versa, it was a while ago I've seen them...

[Ejoc]

There are C examples,
Decrypting a file
and Encrypting a file

[Ejoc]

So I am pretty far along on implement a File encryption/decrypt UDF from the pervious links. Just incase someone else was trying to implement it too.

[Ejoc]

Ok, not ready for a UDF posting but I thought I would post this.

This is my test script, just create a file a.txt (mine just had 'test') and the a.decrypt.txt should be the same, and the file a.encrypted is encrypted.

#cs
vi:ts=4 sw=4:
Ejoc
#ce
#include <crypto.au3>
Opt("MustDeclareVars",1)
;encrypt a.txt using the password test and save as a.encrypt
_FileEncrypt("a.txt","a.encrypt","test")

;reverse it
_FileDecrypt("a.encrypt","a.decrypt.txt","test")

Attached Files

•  Crypto.au3   5.83K   729 downloads

Edited by Ejoc, 16 May 2005 - 06:37 AM.

[steve8tch]

Thanks Ejoc for your hard work here.
Thanks also for your brilliant contributions elsewhere in this community

I have tried the crypto.au3 - it works really well - this is going to be great for sending files around the place in a reasonably secure way.

but...

in order to work on the encrypted file - this encrypted file is decrpted to a plain text file - if a script were to crash before measures can be taken to delete that file - you could leave potentialy classified info around in plain text on a PC.

so...

is it possible to create an option to write the output directly to $var - this way decryted text would remain in memory rather than lying around as a plain text file.

Thanks again.


Oopps - one more question.
Your DllStruct.au3 UDF calls kernel32.dll. Does this exist on a Win98/ME PC? - I am just thinking about a file encrypted on one PC - trying to decrypt it on a different OS.

Thanks.

[Ejoc]

I was already planning on encrypting $var to keep it in memory. I want to do alittle more reasearch on protected memory as keeping the information there would be much better.

Kernel32.dll goes back to win95

[steve8tch]

Superb.
Thanks again for your time and effort.

[Ejoc]

Ok UDF is: http://www.autoitscript.com/forum/index.php?showtopic=11513
Will need new version of DllStruct.AU3 for it.

#cs
vi:ts=4 sw=4:
Ejoc
#ce
#include <crypto.au3>
Opt("MustDeclareVars",1)

Global $s           = "This is a plain text line"
Global $password    = "PASSWORD"
Global $filename    = "encrypted.txt"
Global $decrypted   = ""

;encrypt the string and write a new file
If Not _EncryptStringToFile($s,$password,$filename) Then
    MsgBox(0,"error","Error Encrypting")
    exit
EndIf

$decrypted  = _DecryptFileToString($filename,$password)
MsgBox(0,"decrypted",$decrypted)

[this-is-me]

Does this md5 hashing work on win98?

[Ejoc]

looks like it should, the crypto functions claim to be there from Windows 95 OSR2 and later

[this-is-me]

Thanks Ejoc.

[daff]

hello! im a student, i would like to ask for your help regarding our problem... our thesis, entitled Comparative study about Encryption Standards...i will be waiting for your suggestions about our thesis...

thank you very much.

God Bless you...!

[JSThePatriot]

hello! im a student, i would like to ask for your help regarding our problem... our thesis, entitled Comparative study about Encryption Standards...i will be waiting for your suggestions about our thesis...

thank you very much.

God Bless you...!

What encryption standards are you going to compare? There have been several mentioned in this topic. Another thing is this is a very old thread (1 year). I dont know that here in the AutoIt community anyone is here to help with homework.

Good Luck with the thesis paper.

Go to the first page and check my post. It has a link in it to an encryption software that compares several encryption methods.

JS