How to decrypt a pcode?

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math98 on 20 Jun 2011
Commented: ou dk on 27 Jan 2022
Is there an experienced MATLAB user to provide me with some info on how to decrypt a given pcode?
P.S: It seems that I have to use a pcode version of my original code. Actually, I heard from an old MATLAB user that there are some ways to decrypt a pcode. (to obtain the original code) Of course, by advanced user (hackers :-O ) not newbies!!
Fangjun Jiang
Fangjun Jiang on 8 Oct 2021
I second to that. Users are going to ask this question anyway. This Q&A provides good and useful info.

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Accepted Answer

Jan on 20 Jun 2011
Edited: Jan on 26 Dec 2017
No, there is no decoding method for P-coded functions.
You can use the debugger to step through the code line by line, inspect changes to variables and get a list of called functions. But you cannot get the source code as clear text. And most likely: You are explicitly not wanted to! A decompilation or reverse-engineering of a program usually conflicts with the license conditions and is illegal.
[EDITED] This thread seems to show, that P-coding is less cryptic than I thought:
[EDITED 2] Modern Matlab versions prevent the debugging of P-files.
wonderkismet on 10 Dec 2020
Edited: Rik on 10 Dec 2020
Click to Send Request for pcode Recovery [link removed]

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More Answers (4)

ou dk
ou dk on 2 Jan 2020
in fact ,i can decrypt all type code,include standalone program,p code,other language compiled matlab program.
ou dk
ou dk on 27 Jan 2022

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Meme Young
Meme Young on 11 Aug 2020
Oh man you have really asked a good question, like claiming yourself to be a bank robber in front of a police department
ou dk
ou dk on 22 Aug 2020
A small number of files are available, but you can't use them for profit.

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Fangjun Jiang
Fangjun Jiang on 20 Jun 2011
I thought the Mathworks could do it. But they won't do it. After all, it is put in place to protect many of its source code (part of the reason, I believe). It can be used to protect the user's customer-developed source code too, which is what I like. Hacking is possible, technically. If you find a way, please let me know.
Jan on 21 Jul 2011
@Yair: Sorry. I did not meant the term "hacking" in any offending way and I'm definitely convinced from all I've seen and heared in the last years, that your work is legal and helpful for Matlab users and in consequence for TMW. I'm used to distinguish the illegal "cracking" from the legal "hacking", which means digging in the codes for the not barely obvious features. If any of your investigations and publications of the golden beans you've found is not legal -what is not the case!-, I'd strongly recommend that you get payed by TMW to catch up a legalization retrospectively.
Anyhow, Yair, I've deleted the concerning comment, because I know that the term "hacking" might be misunderstood.

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jgd0008 on 9 Feb 2018
I know it´s an old subject. This guy had an utility running on the web. I used a couple of times, had some minor flaws. However, it´s been asked to be taken down.
So, it´s possible
Walter Roberson
Walter Roberson on 31 Dec 2021
Files that have been encrypted by ransomware are probably not recoverable by any method known to Mathworks.

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