80. Neon Nine
Meeting room in ‘Datafield’ headquarters.
‘Datafield’ was the first server company Yoon Seok-yi hyung picked, and although it was not at the top of the Internet server hosting industry, it was a company with a scale of 10th to 20th.
We thought we were customers who came to use the server, but when we went into sales, the eyes of Manager Park, who was explaining the datafield, turned round.
“Perhaps… Are you here because of what happened yesterday morning?”
Yoon Seok-hyung opened his mouth to Manager Park, who realized that he had made a speech mistake.
“I don’t know what’s going on, but it’s not like that, I just said it because I wanted to introduce you to Yunsungsoft’s server security package… … .”
When Yoon Seok-yi hyung’s brief explanation was over, Manager Park left the conference room telling us to wait for a while, and after a while returned to the conference room with another person.
Most of the men who came together had young faces in their early 30s, but at a glance they could tell that they were executives of the company.
I could feel the way Manager Park treated him, and from the fact that he was wearing a suit at an IT company with free clothing, we could guess his status.
He said, reaching out to Yun-seok-hyung and me to shake hands.
“Hello, this is Myungsoo Jung, CEO of Datafield.”
I checked the business card he gave me, and his email address was [email protected].
OK!
What I checked is that it has its own domain called ‘datafield.co.kr’.
This means that when President Myung-soo Jung logs in to his email, he must connect to the ‘datafield.co.kr’ domain, and of course, this domain will be hosted on Datafield’s server.
In other words, when President Jung Myung-soo logs into his e-mail account, his ID and password information is sent to the data field server.
Of course, since the password is thoroughly encrypted, there is no way to know the password unless the encryption system is hacked.
After checking Yoon Seok-yi’s business card, President Jung Myung-soo opened his mouth with a cautious expression.
“Yunsung soft noodles… Maybe Silver Castle… ? Right?”
20 minutes ago, Manager Park said the same thing when we first met.
Yoon Seok-yi hyung said with a disappointed smile.
“haha–! Yes, that’s right.”
“Tell your brother that you are enjoying ＜Synapse>. But because of the false news, the internet has been very noisy the past few days?”
“Yeah, that’s a lot bigger than I thought.”
“Still, the article-type advertisement-related bill seems to be in an atmosphere of failure. Yesterday evening’s news, and even now, reading articles on the Internet, they say it’s a media oppression, right?”
It was just as President Jung Myung-soo said.
In the case of article-type advertisements, the bill to punish even the media was virtually cancelled.
Eleven of the 13 lawmakers who proposed the bill expressed their position that they would withdraw the bill, right after the media outlets re-examined the allegations of election fraud and the reduction of property in the last general election.
President Jung Myung-soo continued what he was saying.
“ah… ! When I saw the internet news this morning, it was said that reporter So-jeong will be arrested soon.”
I opened my mouth to his words.
“Isn’t that the article that came up this morning?”
To be honest, I didn’t even know there was such an article.
But at my question, President Jung nodded and said.
“ah… ! Right. It will.”
I said with a relaxed smile.
“I know that the news came out quite early, but I think President Jung is a morning person.”
“haha! Right. It’s a style that loses energy in the evening.”
“They say that most successful entrepreneurs are morning people. What time do you usually get up and start work?”
Myung-soo Jung said with a happy expression on my compliments.
“I usually get up at 5, I just shower and go to work right from home. ha ha ha–!”
At his words, I nodded slowly.
Yes, this is enough.
When the story about the morning person was over, Myeong-soo Jung opened his mouth in a low voice.
“Actually, yesterday morning our server was hacked. We’re talking to our security company, Shield.com, and it seems like they don’t understand the problem either… .”
He spoke less, as if he wanted us to come forward.
But if we want to step in and figure out the situation, we need the cooperation of Shield.com, and Shield.com can’t cooperate with us.
Since it was vague what his intentions were, I opened my mouth cautiously.
“Then, can we check with Yunseong Soft?”
“It’s okay to check, but we can’t provide specific information about ＜ShieldSafe> security settings.”
It’s okay to check.
It means if you can hack, try it.
At his words, I smiled and said.
“ah… ! Sure. I know that to some extent. Then, knowing that President Jung agreed to it, we will start working on it as well.”
After the meeting with President Chung Myung-soo, as I was leaving the data field company building, Seok-yi Yoon said to me.
“Jeong-ho, maybe we shouted too loudly earlier?”
At Yunseok hyung’s words, I smiled and opened my mouth.
“Anyway, you have to get down to see it. But I have more questions than that.”
“… ?”
“I mean, President Jung Myung-soo. What did you believe in telling us to try hacking?”
In response to my question, Yoon Seok-yi shrugged and said.
“I found it a little strange, too, because as you said, we have nothing to lose.”
I nodded and said.
“It is.”
* * *
At the same time, the data field president’s office.
After meeting with Yun Seong Soft, CEO Jeong Myung-soo entered the CEO’s office, followed by Manager Park.
“Sir, why did you do that earlier?”
“What?”
“You asked me to hack our server.”
Jung said with a smirk.
“ah… ! Is it? If I sign a contract with Yoon Sung Soft later, I will even get a Silver Castle autograph.”
In response to President Jung’s reply, Manager Park smiled and said.
“May I ask for mine too?”
“ha ha ha–! Would you like to include a clause in the contract altogether? How about getting as many autographs as the number of our employees? ha ha ha–!”
Myeong-soo Jeong, who was laughing out loud, immediately changed his expression and continued.
“The Silver Castle sign is a joke. Manager Park, have you ever used V-Stop?”
“no.”
“There were a lot of rumors on the Internet, so I installed it once, and it was fine. It’s light, it grabs everything, and it’s very fast.”
“ah… ! is that so?”
“I also studied antivirus programs in the past, and I wanted to take a look at the V-Stop source code.”
Manager Park nodded and President Jeong continued.
“At first, I thought that V-Stop was going around by word of mouth because of the newspaper article incident this time, but I don’t think that’s the case.”
“Then do you really want to switch to Michael Security?”
At the question of Manager Park, President Jeong shook his head.
“It’s not like that. There was a minor accident yesterday, but in terms of server security, ＜ShieldSafe> is still worth its name.”
“then… why… ?”
“There is a contract renewal for ＜Shield Safe> next month.”
“ah… !”
“If it goes well, I thought I might be able to use it then. If Yunseong Soft finds a problem, it goes to Shield.com with it. You guys have a problem like this, and it’s like getting everything you paid for, isn’t there a problem?”
“Then what will happen to Yunseong Soft?”
At the words of Manager Park, President Jung shrugged and said.
“I’m sorry for that, but there’s nothing I can do about it. Anyway, Yunseong Soft suggested that I try it first, but for me, there is no need to say no.”
Manager Park nodded, and President Jeong continued.
“Of course, if we find a really serious problem with ＜Shield Safe>, the story will be different then, but it probably won’t happen. haha–!”
* * *
Returning home from a meeting with Datafield, I had dinner with my mother and went to bed a little early.
It was 2:30 in the morning when I woke up to the sound of the alarm.
I stretched out, got up, and pressed the boot button on my computer.
I opened the messenger window and called Incheol.
‘Incheol-ah, are you awake?’
Soon a reply came back.
– I was waiting for you to sleep.
‘really? I have to work until five in the morning, is that all right?’
– Don’t worry about that. I ate five cups of coffee.
‘OMG… ! Is it okay to drink that much?’
-I don’t know. But now, when I put my two hands on the keyboard, my hands tremble and I type automatically, which is strange.
I opened an internet browser, connected to the datafield server, and downloaded the security certificate issued by ＜ShieldSafe>.
However, compared to the certificate I checked two days ago, the contents of the current certificate were completely changed.
It seems that the certificate information has been replaced since it was hacked yesterday morning.
I let out a short sigh without realizing it.
Because you have to recalculate from the beginning.
For reference, from the contents of the downloaded security certificate, it was found that ＜ShieldSafe> was built based on the RSA encryption system.
One of the interesting features of the RSA encryption system is that the value E, which is the encryption key, and the value D, which is the decryption key, are different from each other.
Since the locking key and the unlocking key are different from each other, the value E, which is the locking key, is contained in the security certificate and can be distributed to all users accessing the server.
In the case of a cryptographic system in which the locking key and the unlocking key are the same, it is of course impossible to distribute key information to all server users.
Let’s take an example.
To log in to the domain hosted by me in the datafield, you need to enter an ID and password.
At this time, my password is encrypted using the E value, which is the locking key, and sent to the data field server.
When my encrypted password arrives at the server, the original password that I entered is displayed using the D value, which is the key to decrypt the password.
And what I’m trying to do now is to find the D value, which is the key to solve.
A security certificate based on the RSA cryptosystem contains an extremely large number along with the value of E, which is the locking key, and this number is called the value of N.
The N value in the security certificate of ＜ShieldSafe> that I am looking at now is a whopping 251 number, and this number is a number made by multiplying two huge prime numbers.
If I can find these two huge primes, I can easily find the value of D, which is the key to the solution.
However, finding two prime numbers through prime factorization of a 251-digit number requires a terrifying amount of computation.
A quantum computer could complete prime factorization in an hour or two, but with current computing power, it would probably take years.
There is another method other than this method of prime factorization, and that is to find the number of numbers from 1 to N that are mutually prime with N.
That is, to find the value of the Euler pi function.
However, finding the value of the Euler pi function requires a greater amount of computation than direct prime factorization of N values.
But I have a function that can get the Euler pi function value.
A transformation function that was rejected by the major’s sister.
At this point, wouldn’t it be okay to give the conversion function I created a name?
Since I was rejected by my major older sister, how about a ‘rejection function’?
Hmm… . It’s not bad.
I was able to find the Euler pi function value using the ‘reject function’, and since the N value is a huge number with 251 digits, the ‘reject function’ will work properly with a 99% or more probability.
So, I found the value of Euler’s pi function, and using the obtained value and the value of E, which is the locking key, I was able to find the value of D, the unlocking key.
ruler! You are ready to hack the datafield’s server.
read at noblemtl.com
Now I have to go fishing, and In-cheol specializes in fishing.
I opened the messenger window and sent a message to Incheol.
‘Ready.’