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Welcome to this new section.



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We are going to use Zwi encryption to encrypt our bill.



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And so encryption is is where you take the data and then you use that to our operation on that data.



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So example here, if you have this form banks, and if you were to accelerate in the secret key, assuming



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this is a key, you would get this.



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So this is the SLR operation.



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And then as our operation is where you use the original Beadie zero, and the key is one.



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So you would get one.



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It means either one or the other needs to be one.



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You kind of have more as one.



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So, for example, if the original Betis one and the Keys also one, can you get zero?



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And then over here you are the biggest one.



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But the key is, you know, you get over.



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So there you are, which means exclusive operator.



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Now, the good thing about Axler is that if you a story and you get ciphertext and you want to decrypt



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this, everything's all you need to do is to Azahari again with the same key.



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So, for example, the ciphertext here, which is coming from here, you are you the key the second



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time in these keys, assuming key, you would get the original data.



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This one here.



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So as you are, it's easy simply to encrypt your data.



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So go in, download this Puji zero four storing thing, Bill, and zip and put it in the mail f with



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it on your desktop.



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Inside it, you will find four files.



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The compound, that script will take your source code, which is X and Y encrypt first hip and then



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build the output X file.



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So I could tell that EMC.



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And then you have a Python script.



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Now Python script will and create shell called the shell code.



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Is not bad nor can be sinister on.



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So if you opened by the script, we can see the code for the python, which is very simple imposture



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the system library.



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And then he creates a redeclared encryption key here called secret x alaki narrowly defined function



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contextual R function two parameters, the Schuckert debris, one to encrypt and encryption.



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He's coming from here.



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And then inside this function, you will convert the encryption key to a string.



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And so these variable called encryption key.



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And then you calculate the length of the key and key to a high variable.



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And then we declare you end up with string initially initialized to an empty string.



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And then we use of falu to iterate through the data that we put in for each for each database, tracking



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the element.



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And then for each element, we are going to call it Xolani and then Banita upstream.



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And then over here, the encryption keys also dateable for each time that you encrypt.



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Also use sliding caching key.



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So once you hit the end of the encryption key, then you go back to the beginning of the encryption



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key.



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So you think a sliding, rotating key.



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So for every character, you being content with a different you have a different element of the encryption



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key.



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Finally, when you finish doing that, you are getting help with string.



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And then you have another function to print up the ciphertext to help put it into a string which can



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be ready for you to use in insert your source code, your C source code.



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So the main entry point for these heightened scrutiny over here is one.



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So here you need to specify a parameter for the script to use.



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A parameter is a name on file that you want to encrypt.



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So the naming of fun in this case would be not.



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So this this line here, we just open the file for reading, and you will read by our Women's Week by



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Sister Huckabee one barometer of the scrutiny, Sir Harvey zero will be the name of the screen.



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And then you have a tri accent here in case.



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Yeah.



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User made a mistake by not supplying input far.



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Now you bring an error message to Talisa, the proper usage of the script.



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And then you actually Hiwa, if the user managed to supply the correct parameters, you were going to



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see you wouldn't see that the name of the file to a variable Coplin text, and then you would proceed



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to this line here that you will call the actual function, which you be fine up here.



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Yes, we are functional.



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Then take the first parameter as they're paying taxes, which they're put the name of the farm and also



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take the encryption key, which is defined out here, and pass both parameters to the function.



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So the function we then implement string and return stream and then finally we string will be safe to



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another variable called ciphertext.



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And then here is where you print the output of the ciphertext.



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So to use this file, you need to open a command prompt.



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Using how?



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Issuing a a.



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And then we hear you have our note sherkat, which is similar in a previous peasants'.



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And over here is your C program.



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Let's open it.



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So, yes, he program here.



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We have a function to decrypt.



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And this is the P paid is defined so that you could function a.



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One, two, three, four parameters, the encrypted data, the line of the computer, and then the encryption



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key and allow the encryption key.



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Initially, he find the key and then assign Nicaragua's key index of zero.



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And then here is way available through the data, yet yanqui data.



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And then you can go from element by element till he reaches the end of the string.



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And then you will use the key encryption key character by character.



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So starting in first element of the character.



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And then here, if you reach the end of the encryption key, we ricchetti back to zero.



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And over here, you see where you decrypted by Xolani.



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If the key encryption key first element and the first data element, zero of the encrypted data and



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then you write the three, you will write.



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They cannot use anything.



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Then you increase their key next.



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So now you look you will now go into the second element of the encrypted data.



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And you also have the second key second element of the key.



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And then you repeat the whole process until the whole thing is decrypted.



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So once it's finished, decrypting your original encrypted data that is sending will be overwritten,



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either decrypted data.



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You have the main function here.



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And this is where you need to base your encrypted string.



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So when you and you first start out this thing we blame, his team will be blame.



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He will be just be like this.



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So you need to supply the peel.



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So then by running the encrypted Python script, if they're not bendin as a barometer.



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And then you take the output and then we presume here you do that in a while.



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And then here is value.



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Copy the size of the payment from up here, sivi to a period length.



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And here is very defined encryption secret.



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So our key issue and as you you use Koczela to allocate memory and prisoner addresses and also the pillar



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which is in phone and also get address how the allocated memory us for user to press enter.



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And then it is a present.



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He goes ahead and called the decryption function or here and passes the pillar a payroll line.



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He comes home here.



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And then the payroll is coming from here.



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And then the encryption key, which is coming from here.



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And then the site I encryption give his calculator.



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And then here, copies after the decrypted, your payload will then be overwritten, meaning you to



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decrypt it, and then you pass encrypted data into the memory function.



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We should copy the data into the allocated memory.



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He came from QEP, which I like after.



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Then you use whatever attack you may get, which I'll make a logical memory executable as before.



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And finally, here you present again.



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You will again create a check and execute Elkington memory, which now contains the decrypted data.



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So that's how it works.



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Now we are going to you are going to use encrypted Python script to create our encrypted mail.



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So let's open air coming up.



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Angry here.



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Clicking on excessive quantitative tools.



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Then you copy the path of least for that, come here and change directly to it.



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Now we are going to call this script if Python two point seven.



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Not on my computer.



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You should be synergize python two point seven, async CGI.



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And then you scored on this is Python two point seven and Python iciest is one.



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So we need to copy this path where the python is fun.



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So we copy this part, print here, paste, put it best name, and then the name of the python.



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You can use Python three point seven, because this is not this script here.



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It's not compatible with Python 3.0.



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And the next thing you need is to call a script.



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So the new screenies and create the XOR.



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Incorrect.



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So our python know if you pretend to be tiny parameters, you will show the usage.



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He says his name is in locationally a python EIC.



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In memory of Python, screw the input far Ananya profile.



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And here you have a redirect operator so that when you run this, you how could you do this far?



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OK, so this is how easy.



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So you repeat the command now you supply the input file input.



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Far East been.



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So we take what they mean.



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If you press enter now, we start providing the redirect operator to the aquifer.



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You enter now you output your screen.



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That is not what we want.



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You only output to a file.



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So we repeat a command.



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We put the right redirect.



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Operator have you given up?



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Will find the time note back.



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Not so far as to ask you.



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Remind ourselves that this is actually going encrypted far.



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No, we can't.



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And now we're new, far greater here.



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So our next thing we are going to open this file opening is not bad pass plus.



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And this is your very encrypted data properly formatted for you.



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And I see.



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Formatted.



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So we copy everything correctly and copy.



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And we are going to open our source code far.



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We've looked at best place.



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And then over here, we are going to paste our content file here.



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Yeah.



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I see.



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Let's go to the right, Michou.



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Everything good.



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Everything.



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So now remember to save this.



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And then we are now ready to compile it.



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So we will run the compiler script.



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Press enter before I to campaign here, Cifas.



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And here you see he is completa Yeti fans who are here.



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Now you can run this Assefa.



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So he brings the pillar in yellow memory address as it you press enter to decrypt.



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Oh, so I built it.



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So you present danger, you create, you present danger.



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You may shellcode launch an attack.



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So that's how it works.



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So in the next video, I'm going to run it again and examine the NBG.



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Thank you for watching.