Crack/decrypt files?
#1
I'm looking for someone who can crack files and hopefully make a tool for me that can automagically decrypt these files.

What I do know is that the application it comes from is made in Java, and that's about it.

I have 3 versions of files it can produce and I do have a clear text version of the file.

Can someone please point me in the right direction?
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#2
(03-20-2021, 04:29 PM)curiousgorg Wrote: I'm looking for someone who can crack files and hopefully make a tool for me that can automagically decrypt these files.

What I do know is that the application it comes from is made in Java, and that's about it.

I have 3 versions of files it can produce and I do have a clear text version of the file.

Can someone please point me in the right direction?

You can try decompiling the Java application. I had luck with that in the past.
First of all, look for the algorithms that are used for encrypting the data.
Here you can find a couple of threads explaining how to set everything up:

https://greysec.net/showthread.php?tid=2161
https://greysec.net/showthread.php?tid=342
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#3
Do you have the program that was used to encrypt them?
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#4
(03-22-2021, 09:00 PM)nextlinemail Wrote: Do you have the program that was used to encrypt them?

Oh I totally misunderstood OP case, he said that he knows the program is made in Java, not that he has the program itself.
Now that I re-read the question he mentions: "I have 3 versions of files it can produce and I do have a clear text version of the file.".
So I guess he does not have it.

Taking this into account I would say it is only theoretically possible if the encryption is done as is. If some data is added in the encryption phase it is practically impossible.

Anyways, first of all you should check the algorithm used, so afterwards you can see how slim your odds are and cry.
Start by checking padding and all that, or maybe use one of those programs that try to guess the algorithm used.
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#5
What kind of crack are you after? I think he either wants software to be nulled out for security or break a password that is associated with the java application. Or maybe a serial?
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