Chapter 39 second quarter

The courses in high voltage electrical engineering are drowsy.According to gossip among the students, this class not only does not call names, but also turns a blind eye to cheating during the exam. There are only a dozen students in a classroom that can accommodate more than 50 people.Tomohiko sat in the second row, resisting the drowsiness that made people lose consciousness from time to time, and copied the principles of arc discharge and glow discharge explained slowly by the white-haired associate professor in his notes.If you don't move your hands, you may fall asleep on your stomach at any time.

Sonomura Tomohiko is a serious student at school, at least, the students of the Department of Electrical Engineering, Faculty of Engineering, Shinwa University think so.In fact, he will definitely attend any courses he takes.He would skip classes, but only in public subjects that had nothing to do with motors, such as law, art, or popular psychology.He is only in the second grade, and there are many such compulsory courses in the schedule.There is only one reason why Tomohiko listened carefully in the professional class—Ryoji Kirihara asked him to do so for the sake of his career. Speaking of which, Tomohiko chose to study electrical engineering because he was influenced by Kirihara.In his third year of high school, he had good grades in mathematics and science. He considered studying engineering or science, but it was difficult to decide which department to choose.At that time, Kirihara said to him: "The future is the era of computers. If you can learn this knowledge, you can help me."

At that time, Kirihara continued to sell computer game programs by mail order, and it was quite profitable, and Tomohiko also helped him develop the programs.The "help" Kirihara mentioned probably refers to developing his own career. In this regard, Tomohiko once said to Kirihara, since you have this idea, you might as well read it yourself.Kirihara's math and science scores are not inferior to his. At that time, Kirihara showed a tangled smile on his face. "If I had spare money to go to college, would I still need this kind of business?" Only then did Tomohiko know that Kirihara did not intend to continue his studies.He made up his mind to learn the knowledge of electronics and computers. Instead of facing the future in a daze, he decided to help others, so that it is more meaningful to go to school.What's more, he still owes Kirihara a favor, no matter how many years it takes, he must repay it.The incident in the summer of his sophomore year still left a deep scar in his heart.

Based on this reason, Tomohiko decided to take all professional courses as seriously as possible.Surprisingly, Kirihara read the notes he organized in class very seriously, and there were professional books beside him to understand the contents of the notes.Although Kirihara has never attended half a class of Shinwa University, he is undoubtedly the person who knows the content of the class best. Kirihara is very interested in one thing recently, and that is magnetic cards such as debit cards and credit cards. Tomohiko began to contact magnetic cards not long after he entered university.Tomohiko saw a certain device at school that could read and rewrite the data input on the tape, called an encoder.Hearing Tomohiko mention the encoder, Kirihara's eyes lit up, and he said, "Then just use that, and you can copy the debit card."

"Maybe," Tomohiko replied, "but it's meaningless to do it. When using a debit card, you need a password, so you don't have to worry about losing the card, right?" "Password..." Kirihara seemed lost in thought. After two or three weeks, Kirihara moved a cardboard box the size of a tape recorder into the office where the personal computer program was made. The box contained the encoder, a place to insert a magnetic card, and a panel to display the contents of the tape. "Thank you for getting this kind of thing." Hearing what Tomohiko said, Kirihara just shrugged slightly and smiled.

Shortly after getting the second-hand encoder, Kirihara forged a debit card.Tomohiko didn't know who the original card holder was, because the card had only been in Kirihara's hand for a few hours. Tong Yuan seemed to have withdrawn more than 200,000 yuan in two installments with that fake card.What is amazing is that he actually cracked the password from the data recorded on the magnetic card. However, there is a mystery in this.In fact, Kirihara had already successfully deciphered the pattern of the magnetic card before obtaining the encoder. But without a special machine, how to crack it?Kirihara once practiced it for Tomohiko, which was really eye-popping.

He prepared extremely fine magnetic powder and sprinkled it on the magnetic strip of the card.After a while, Tomohiko yelled "ah" - thin stripes appeared on the magnetic strip. "It's actually very similar to Morse code," Kirihara said. "I do this repeatedly on a card that I know the code in advance, and I can see the pattern. Then I do it in reverse. Even if I don't know the code, just let the pattern emerge. Can be broken." "Then just sprinkle magnetic powder on the debit card you picked up or stolen..." "It's ready to use."

"Really..." Tomohiko couldn't think of what to say. Maybe it's because he looks funny, Kirihara rarely showed a happy smile from the bottom of his heart. "It's ridiculous! How safe is this? Bank staff often tell us to keep passbooks and seals separately, but things like debit cards are like putting safes and keys together." "They really think it's going to be okay?" "Someone should know that this thing is actually quite dangerous, but it's too late to hold back, so I have to shut up, and I must be worried that something will happen." Kirihara laughed again.

However, Kirihara did not immediately use this secret technology.In addition to being busy in my own business, making personal computer programs, more importantly, it is not that easy to get someone else's card, so I just copied the card from an unknown source after I got the encoder.For the next period of time, he didn't mention the card. This year, however, Kirihara said, “If you think about it, you don’t have to get someone else’s debit card.” At the time, they were drinking instant coffee facing each other across the old dining table in the cramped office. "What do you mean?" Tomohiko asked.

"Simply put, it needs the account that is still in use, not the password. When you think about it, this is really a matter of course." "I do not understand." Kirihara leaned back on the chair, raised his feet to the dining table, and picked up a business card: "Assuming this is a card, put it into the machine, and the machine will read the various data on the magnetic strip, one of which is Account number and password. Of course, the machine does not know whether it is the person who inserted the card. In order to judge this, you will be asked to enter the password. As long as someone presses the number recorded on the magnetic stripe, the machine will confirm and spit out the money as required Come out. You think, if you take a blank card with no data on the magnetic strip, enter the necessary data such as account number on it, and then enter a set of passwords randomly, what will happen?"

"what?" "Of course the cards produced in this way are different from the real ones, because the passwords are different. However, the machine has no ability to judge this. The machine will only confirm whether the number recorded on the magnetic stripe is consistent with the number entered by the cashier." "Then, if you know the real account number..." "It doesn't matter how many fake cards you make. Although they are fake, you can really withdraw money." Kirihara raised the corner of his mouth. Tomohiko had goosebumps all over his body, he understood that what Kirihara said was by no means empty talk. Later, the two began to forge bank cards. First, they reanalyzed the codes recorded on the cards to find out the order of arrangement, which is the initial symbol, user code, authentication code, password and bank code. Secondly, they retrieved many bank statements discarded in the trash cans of the bank, and according to the found rules, they converted the account number and randomly selected password into seventy-six-digit numbers and Roman letters. The next step is to use the encoder to input the string of numbers and codes into the magnetic strip, stick it on the plastic card, and you're done. Tomohiko successfully retrieved the cash blank card, which was their No. 1 finished product.They selected the account with the largest balance from the several schedules they picked up.This is Kirihara's opinion, because it is relatively difficult to be discovered, and Tomohiko also feels the same. This was undoubtedly illegal, but Tomohiko felt no guilt.One of the reasons may be that the process of making counterfeit cards is too much like a video game, and the fact that the stolen object is completely invisible is also a reason.However, he deeply remembered what Kirihara often said, and that was the most important factor. "Picking up things lost by others and not returning them is no different from stealing things that others put at random. Isn't it the person who put the money in the bag casually? In this society, people who let others take advantage of them Doomed to suffer." Every time he heard these words, Tomohiko always felt a burst of pleasure when the hairs all over his body stood on end while trembling with fear.