I followed the steps in this tutorial and then when I patched it my antivirus said it was a trojan and quarantined it lol.

I always wondered how people made cracks and stuff, now that I've learnt some computer science and watched this video, I didn't realise it could be so simple.

I've always struggled understanding registers, but as someone with an uncle that's on the same register as yours, I now fully understand them, thanks! #FreeAllUncles

Honestly you're a massive help, you not only made the concept easy to understand, but you made it really funny to learn about it.

See this is the kind of content people need to watch when researching complex topics like this. Literally just needed a small bit of Info from this video and got it In seconds good job!

I took an assembly class in college. We did a ton of of projects. I had no idea that it's this easy to exploit an application. pretty awesome

I've been into reverse engineering since way back in 1998, so I have some experience in this area. I just wanted to say that your video is pretty good, and I appreciate your honesty about your skillset. I have a few suggestions, though. It would have been helpful if you explained the JMP (jump) and why you made changes to that particular code. Additionally, it would have been better if you mentioned the option of using NOP (no operation) as an alternative. In this case, if you NOP the code at 4012BC, it would automatically move on to the next line. Ultimately, you achieved the same outcome by making it jump to 4012BE, but it's worth noting that you could have just NOPed the jump, especially since the "Good Boy" comes first in the code. It would have been beneficial if you also explained what JNE means and what the comparison was. Another suggestion I have is to use a breakpoint at 4012AB, then proceed to the next line and examine the stack. If you did that, you would see your correct serial number pushed onto the stack. Anyway, your tutorial was very easy to follow, especially for beginners. Great job!

This is honestly a lot more straight forward and easier than I expected.

"instead of storing little kids these registers store data" was the line that made me subscribe

Your programming skills are nice! You should start a KZfaq channel.

I’m currently working towards an It degree, and I’m almost done. I straight up learned more from your quick video than I have in any of my classes. Awesome vid man!

Another simple solution is just changing the opcode relative address to 00 instead of 16 so it becomes "75 00". As 75 is the i386 opcode for JNE("Jump if not equal") instruction it will just jump to the line after the instruction. A different way to think about it is like the following. if(key != correct) { correctKey(); } else { correctKey(); } Both paths lead to the same function in memory.

Loved the explanation!!

this video has such like 2008 youtube vibes. I’m a fan

I was looking for this the other day and was so pissed that i couldnt find it, started to think it never even existed

Thank you so much for sharing your amazing video with us! Plz consider start a playlist solving all the challenges in the website you mentions, like once a week. Thanks in advance!

haha so glad you made this. You stitched the fragments I had in my mind into a complete fabric of understanding.

This is the best explanation (so far) I have seen on YT. Great work mate!

damn dude, barely a minute in and I love the content. Keep this up, you're talented! :)

The tools are way better some 24 years later! I used to do this with a hex editor for fun... Because the games usually aren't as fun! The shock of seeing what they did to create a more difficult keying code was fun. Some were NASTY the more money you had to sink into what it was back then... I'm trying to fix old GTA 2 to stop checking for the darn disc and spinning it like crazy! My vintage PC rig is vintage enough that I don't want to see it lose the DVD drive... Unreal 4 at 560 fps on older hardware is to crazy!

Thx a lot!!! The video was totally helpful for me to understand on the spot how the crack files are made.

3:30 was just crazy with the music as well great job on the vid btw

That one joke about your uncle, made me subscribe. Hilarious dude. 😂 instead of storing kids... omfg

Bro just explained my entire Year 1 C++ class in 8 minutes

This was a legitimate intertaining video ! In a world of short span attention this kept me intertained ! Congrats

I really really like your approach, keep it up Bro

Nice video! I would assume most keygens nowadays are done on a server so the actual translation code isn’t exposed which explains why keygens are way less popular now

Just downloaded x64dbg and gave all this a shot, it was piss easy! Just going off memory (no pun intended) and clicking through the video a couple times I got it done in less than 30 minutes, and the second time I did it, while screenshotting each step to my mate, took me around 6 minutes. Super educational video!

Another important thing to mention is that not every registry key system works like this. 99.99% of modern implementations call back to a server that can validate if the key exists, and it's randomly generated per user meaning the only way to crack it is to either remove the key check from the client, or to get the server to generate a key for free.

I love your explaining.

you deserve more subs keep doing what you do man!!

bro your content is great. keep up the good work!

I appreciate your work bro

Registers are where the processor temporarily stores data. Your program is loaded into memory and arithmetic is done by the processor.

this video led me to take the computer architecture course at my school. thank you for opening my eyes man. i might have graduated with cs without ever touching assembly

Really nice and interesting video man. Made it very entry level to understand. Loved it

i have nitifications on but i never got notifs for the last 2 videos lmao -- only reason I checked the channel again was cuz of some bot in ur comments .. but I remember this being a good video so .. good reupload :D

bro uncle kenny caught me off guard. great video thx

i actually learned something, thanks for this video.

As someone who has some programming background but is oblivious to this stuff, awesome video. Was super easy to follow

this video is explaining something that look very f#cking overwhelming and yet it does in a hillarious way and it do teach how to no get intimidated by assembly, good job dude

Didn’t even notice it was gone😂

Thank you, I managed to create my own crack on this.

Yeah that was pretty straight forward, as long as you're able to read assembly. That explains why almost every login or password system I've ever came across uses servers.

solid intro to reversing

Great video! Super clear and entertaining :) Question tho... What if you can't find the string with the dialogue from the registration box? I've tried searching for every bit of text in there, but I can't find anything as cut and dried as the "bad boy..." example. How do I find the right code if I can't search something that specific?

Great video, though a bit over my head. I came here because I want to debug/decompile a databin unpacker--the one tool that's out there seemingly doesn't extract everything and I have no idea the compression method used to try and get into it myself. I have my own tutorials on hex editing save files and messing around with a game's active memory to make instant changes, but this would be a leap for me. If you check your comments, would you be willing to give me some direction? Thanks.

Really like It thx ,could u more reverse engineering video? Thx and keep It up

Thanks Doublelift!

so this is how normal ppl start learning reverse engineering. I just jumped straight into the difficult stuff, didn't get anything since the program was rather complex and used multiple system libraries and i just dropped the shit even knowing a little more about computers than this vid explains

Cool, always learn from you. Impressive

friend building chair speaking chinese had me subbed

Amazing content! Keep it up

Even better the second time

How tf did u know i was picking my nose

this is so cool nang

This video reminds me why I stopped trying to do this sort of thing, all the tutorials for it miss out like ten steps at a time.

Now try cracking it when protected with VMProtect 😂😂😂

Thank you nang. Very cool.

Great video!

Fire video bruhman

I did this exact "exercise", although with no UI in Linux and a really primitive debugger, in my Assembly Language course in my fifth semester. I remember looking for the password for five days while searching through thousands of registers and trying different subroutins until I realized that I could just change JNE to JMP and be done with it 😂.

Guys similar channel suggestions please

This tutorial is so good

This is amazing, well done 👍

nice vid man

I mean...that's not what they mean when they say write a keygen. The whole point is to reverse engineer the algorithm to find out how the password is created for the given username. While this is technically a "key generator", you're still just patching the program.

Can you make a full guide on how to reverse engineering please :D

BTW Adding a breakpoint to the variables when he is demoing the keygen is an easy way to spot out the actual key and not need to guess

Or you could just byte patch the jump instruction in a hex editor after you find the location in your debugger. No key gen required.

Your outro music has not improved. But again - great vid

didn't even know that this was known as reverse software engineering. we did a lot of this back in the day when we wanted something (like flashfxp for xbox modding). me and my buddy used hexeditor and learned by fkn around and screwing everything up. just had to identify where to do changes. was way easier back in the day though.

Great content!

ok,,,, but what do you do if there are no strings to go off of?????? most of the time there wont be strings..

3:52 #freemyboyuncleKenny 🙏

The joke on registers went from 0 to 100 before I knew it.

I like to make these more challenging- You could make it autofill the password field with the correct code, or even just bypass the entire login on start up.

2:21 I was literally picking my nose dude

coolest dude on earth😎⁉️

Very top-level breakdown. Takes me back to the good old days. I miss old apps being weak, like Winzip %04x%04x byte patch. RIP jne 9090.

Cool. I remember downloading cracks and keygens back in the day. There was always that moment of hesitation. Do I want to keep using this software or do I risk getting a virus? The best keygens were the ones with that kickass midi music.

I thought the registered offender joke was random, but the "instead of storing kids" part got me

BRO SAID DON’T PICK YOUR NOSE FRIENDLY REMINDER AS I WAS PICKING MY NOSE

Awsome video!!!!

how with online activation programs...??

can you do more of this Reverse engineering puzzles but with explaination ? thanks

💀 that uncle joke tho

Hello, can I ask you something, maybe you will find it interesting. A ransomware called x101 encrypted my . 500 gb in one minute. The files now have the extension .x101 . After researching the vrus seems very new, it's about half a year old and from what I've read about OTHER ransomware I think my files were partially encrypted, just the beginning and maybe the end. The files are TS video files from 700mb - 4GB each. Fortunately, I had saved some files on an external SSD. It appears that the encrypted files are exactly the same size as the original unencrypted files on the external SSD. I already tried to snap the extension back in place, it didn't work :)))) why did I think it would work? Is there any possibility to find the encryption mode by comparing an infected file with the uninfected one (identical file) or to delete the encrypted part and leave the code unencrypted and the video will go, possibly missing the beginning and the end? With what program could I open them to see the binary code consisting of 0 and 1? Which is better according to you, free and open source if possible. I know there is always a pensource / free variant.

so you basically convert a program into assembly code, find an error message that gets sent when you put in the wrong code, look for that in the assembly code using memory spots instead of variables/strings, then attempt to understand how jump if not equal statements work, and then find the conditionals for that statement. and that's how you hack into ubisoft :)

I'm hoping for you're future KZfaq contents, New subscriber here!.

☠️uncle kenny

Hey Great Video I have programs like a software to dim the monitor light. The problem is his background is the normal standard program withe. It blends me every night if I will dim the light. I really wish the background of it would be dark. Can you show how to Reverse Engineer a software and make his background like dark mode ? program I mentioned is Free Monitor Manager but it could be any. Greetings

These are basically new outdated tuts. Man I'm old.

You could have also put an NOP at the jne. Or if you wanna be extra safe, also nop the condition check too. :P

As long as you can get into the base data anything can be changed, the keygen got an uno reverse card lol

can the same approach be used on the Change Machine ID-based license software?

If the key on this crackme is always the same then it is not that much of a challenge. A crackme in which you HAVE to understand the algorithm that generates a different key for each user and you have to do it without bytepatching would be way harder than this. Even then, compared to the amount of obfuscation, anti debug measures that software has nowadays, makes cracking a bitch to deal with.

Great content. Keep up

For ethical hacking and education purposes, you are the goat!

Now I can't wait to see why DENUVO is so hard to crack.