Welcome back.
In our next Cochimi.
We see three, we are going to take a look at how to use the understanding of ASCII code and hex numbers
to solve it.
So if you want to give it a try.
Please post the video and give it a try.
So this is how I solve it.
Jesse Tree into our session one.
It is detected in Alphabet City form, which.
This is a result of the import.
OK.
Directory into the browser to begin the process of analysis.
Yes, to analyze, analyze.
Watch the bottom right corner.
To see when it has completed now, it has completed the analysis heading over to the symbol's table
and expand on the functions folder and look for the main function.
Head over to the decompiled window, and this is your main function.
Let's change the signature of the main function.
It is raining, this first barometer has Occy and his second parameter.
As China starts to her movie.
Now we will try to run.
The me.
Quota register and open you, Craney.
Open the terminal here.
And let's run see three.
S. three without any parameters, will you the string please provide the secret password?
Go back to your browser and you will see.
Yet see three, if they ran any parameter, were you this message, please provide the secret passageway,
take on the terminal.
Again, this is because of the check here.
If oxes not do, then he was sure this message so because Occy in this case is the one, so this condition
is not satisfied and he jumped to the Aspen to show this message now to provoke an argument three days
and now you see a different string.
This time he has satisfied recognition Huaxi oxys do.
So this is true.
And so it enters the block.
And thus these instructions.
The first line you can the string string.
Then over here, he start to streamline to this variable as to therefore we know that as far to is a
length that's renaming.
To link.
One is the barometer pass.
To the program, which is destroying a.
Even the 90s, less than five.
Then you show the strain, which is appearing here.
Not the length of our stream history, so this is true.
That is why it is showing this.
So that is try now with a lengthy.
Fi.
Since it is expecting in the to be five characters a month.
So we type in five days, and this time you get a different string as the message.
So in this case now this test is false.
So it gives the F effa and goes to the L spot and perform the second test.
Now, in the second test, you minus this.
From here.
And see whether the result is zero two zero.
So it is trying to straight.
The character of your password.
And then minus that from the fourth character, your pursuing.
And check to see whether the result is six two zero zero two zero is hexadecimal.
We can convert it into
decimal.
By using programers calculator.
So send a hex to zero, convert into decimal, he's 32.
That means he is taking the third character.
Minus the fourth character and see whether the result is three to.
So how can that character minus for character give you the key to the answer is if the third character
is an alpha, but.
And fourth character is also enough of it.
So in an effort, but minus in an effort, it means that we are minus the ethical.
Every character is encoded, the esky could.
So the corrective for every effort, but has a corresponding as equal as you can see.
So if your first character is 97, 97 minus, what gives you the right to that is the equation we need
to solve.
If he was scary, he did the character here, he's a.
And if there is a question mark.
So a minus Kushima.
What can I tell you, this question might be so that you can get ready to if you look at Ezgi court,
he is 97.
So 97 minus, what gives you the two?
You can solve it as a equation, so in order to know what is a question that we can solve in this way,
the question now is how close to a minus 32?
And that gives you capital a hole here, capital a 65.
He's 37.
Ninety seven ministry to give you a 65.
So maybe seven.
Minus.
Thirty to give you sixty five.
So Acidify, you look at capital, he saw the Soviet.
A my question, my hostility to is actually.
A minus capital here that gives you 30 to.
So using this and placing Bane here.
That character is lowercase, a fourth character, his advocacy, and we get this as a part of it.
One, two, three, four, five.
What is important is these two.
One in two, four and five can be any number or any character.
He doesn't matter.
What matters is that your third character, minus the fourth character, must be two.
Yeah.
So you can have more than one answer.
It doesn't have to be a Alberghetti.
He could also see other combinations of ASCII character so long as the difference between them is that
he too.
So let's try this out to see if he's going.
I will try this again.
This time, I'm going to put one to Will Casey Casey for fun, and this time you see a different message
which is coming from here.
Correct you, Figueredo?
So this is how we can use the understanding of Sakiko and Hex numbers in order to solve this, correct
me.
That is all for this video.
Thank you for watching.