2019 computer security research note

I HIT degree, direction audiovisual signal processing in the computer science and technology.

All sorts of things learned in junior security research is winter, when reading an article that students turn in a circle of friends, I realized that security research really is not so simple. There are summer camps, pre-free push, and nine final-ditch push and so need to grasp every opportunity. Now own security research history come to an end, in retrospect feel predecessors blog helped me a lot, so wanted to record their own security research history, heritage look, help students look at later.

As we engage in this session Enrollment and teaching reform, the entire school system suddenly became more complicated, so the rankings has been a substantial change in the dynamic. Sophomore next semester I was discharged to 19%, really set my panic, so hard a year later, when the final ranking 26/256 camp look like after the first 16 points. But in fact, when applying for summer camp, I probably still only ranked 40 +, I did try holding the mentality that is reported to the Zhejiang University of CAD summer camp, did not expect to last through written examination and interview really went in.

When it comes to summer camps, we must also mention the various different schools. Zhejiang University is a relatively special, and Computer Science, so-called "summer camp" is actually a month-long laboratory practice, practice after the end of each lab group will recommend a student to participate in the interview straight Bo, if it is basically through interviews Zhejiang University to book in advance the identity of the person behind the series are just taking a process; but most of the other schools in the camp, in fact, only two or three days, the main content is to visit the laboratory, written test and interview. Precisely because of this, Zhejiang University summer camp actually sign up people who are not particularly large, first, because the only places to straight-Bo, and second, because time is too long so the actual summer camp and many other schools have a conflict.

Since Zhejiang University has been regarded as one of my knot, so although taking into account various factors, I still insist only reported his camp. It should be noted that the computer camp is the real power of each group of teachers, he eventually decided to work and free choice final push during the summer camp (and of course the general will discuss to discuss their PhD). I was interviewing summer camp is a laboratory seniors face, with online documentation to do a few questions (non-PAT), then the project is simply to ask things like, in short, the feeling did not end after the end, once thought it was cool. Later, I see seniors has yet to react to personally contact me and asked if I confirm that I have been accepted only to discover that I go into operation, then changed their summer plans to go to the Zhejiang University.

CAD laboratory at Zhejiang University, Zijin Campus, hardware conditions in the laboratory is very good, but really stay in general (I do not understand where he comes from so many mosquitoes are?). Stay at White Sands, small bed, one meter eighty-something I feel very cramped, no mosquito nets and a few days ago, did not buy a mattress mattress extremely hard, extremely poor quality of sleep every night, so it can not stand to go out a few days later . After buying a mattress to, and in seeking the supermarket to buy a mosquito net after the situation a lot better, but sleep is still very general.

In the meantime, the teacher saw a few faces, for the first time is to take us to the river to visit the laboratory, the second was to take us to the edge of a West Lake teahouse "group building" and, finally, one evening suddenly laboratory I looked at our schedule. I was assigned to the task is relatively simple, quickly done, so was later distributed a new task, also got a job laboratory data seniors currently a research project copy. Finally, at the end of the summer camp teacher talk to me quite a long time, meaning that between me and another girl were hesitant, and asked me if I was going to go abroad, would be willing to test the software in September Institute (since by soft hospital supervisor can still be him); in fact, I was not sure was going abroad or at home, so I frankly have a willingness to go abroad, but if you give me a straight Bo places I would not go abroad should. The teacher heard that in September I think you try Master of Software Institute of it, so that you are flexible, you can research after a large turn-Bo can also go directly abroad. I thought to myself estimate does not help, listen to the teacher, said that right ah! The program also really flexible, say, Hey, really like ah ...... although after leaving then I think things seem not ah, the pre-September push this straight Bo-free and does not conflict ah, I say not to give up a chance ? The results in the evening received information about the teacher, said recommended another girl and told me to get ready to push pre-September-free machine again.

I was just going to go home, but the teacher very generous to say that if you want to come straight Bo Zhejiang University, I can refer you to other teachers, if teachers interested in you, they will in the next two days contact you. So, I spent a day and a half in the dormitory. During this time, my roommate and another bike the whole Zijingang are shopping again, also saw the unknown functions currently seeking Auditorium.

But wait until 8 in the evening, the teacher did not contact me, I would like to interview No. 10, as well as the teacher does not always have to contact me before the last day, so I impulse bought a ticket directly home at night, clean up good things home. At the station waiting for the bus when the heart is still a little hard for me to go home after all these emotions swept away! I slept well, complementing the energy, ready to start thinking about tomorrow PAT exam, the September battles.

At noon the next day, the teacher had called. The teacher sounded quite worried and asked my professional learning, but in the end he thought I felt a little poor visual direction and distributed his research too far and did not recommend me for an interview. I thought to myself this is a small but waves of it, did not take too much to heart, but also the results of other teachers to call in the afternoon (deadline is productivity?), I chatted with a teacher, after a phone, it is really a video interview Bo got a recommendation straight places.

But in fact the teachers did not know I had to go home! ! !

This time is already No. 9 in the evening, and I thought I might only rush Hangzhou car the night, but asked a roommate to take part in the interview, I was pleasantly surprised to learn that the interview was postponed because of the typhoon lekima No. 11 (sorry, although the typhoon disaster, but tell the truth, when hearing the news, the original really nervous heart suddenly relaxed), intended to go tomorrow morning to Hangzhou. And parents are originally intend tomorrow to attend a friend's house the child's studies feast, it seems I can only dove a.

The results the next morning I was stupid, because the typhoon lekima, all to Hangzhou EMU gone!

Discuss the next, immediately decided to father and mother drove me to Hangzhou (fortunately was not too far away), and just the whole family into a dove king.

Because in the Yangtze River Delta, so in fact we actually feel way too violent typhoon, rain as if to smash the windscreen of the same non-stop to drop down, high-speed basically could not see anything, hear the only the sound of rain beating, and later in retrospect, I am very grateful father and mother leaving no spare capacity to give me support. Interviewing is in Yuquan Campus, we directly at the edge of Yuquan stay the night at the interview to become familiar with the location (next day only to find the wrong) Yuquan, then a street food outside the school to eat a chicken pot , you can really taste.

Since this interview was indeed places to get some "accident", so I have no psychological burden. The next direct traveling light. I had a last interview was the third group of students to discuss a bit later and moved up to noon. The interview did not follow the routine the cards, even to the red white paper, had previously been found in PubMed interview, the interview never appeared straight Bo. I drew a blank Booth algorithm is very long, I did not quite understand, forcibly back for a while; red paper is the database, quite simply, Kanji Yan remember. Once inside, he surprised to find sitting in the middle of summer camp teacher is, indeed, a little embarrassed (Behind his). Teacher saw me, I say you are not the last one, I explained next, and then he nodded his head and told me to sit down, cross the red white, made a resume, do self-introduction in English. (Thanks to the teacher did not really get me some surprise, there are several groups do not follow the routine the cards, do not introduce themselves to casual questions)

Because my self-introduction is entirely self-flying, and not related to anything related to performance, but also mixed with some scripts, so I've been paying attention to the teacher's reaction. Introduce themselves teachers still would listen, and only my mentor since summer camp in red white paper did not look too concerned. Talked about half of the teachers should be read red white, and he interrupted me and asked me the subject of red paper (really very grateful to the teachers, and if you ask most of my white paper to cool it), so after he it means the end of the English section.

Then the teachers first question is, I think your English is very powerful ah, how would IELTS 5.5?

I say that because I embarrassed session 2 games, anyway, to explain a bunch, with a teacher who is talking and laughing, there are estimated to account for a period of time.

Followed by another teacher asked me why straight Bo, I said to say that personal experience, but also a bunch of, you run into a smart phone from junior high school has been much talked University replacement wave, then it is logical to ask the teacher, and that the underlying Andrews Shaa?

I was trying to say Linux, but I then I thought better to do a high-end point, and I say that they are unix-like, but the teacher thought I said that unix, he said no, it is Linux.

Later, his basic question revolves around Android, and I rarely associated with development experience, so in fact the answer was pretty embarrassing, but fortunately finally be successfully transferred to the topic of Java. I answered this question above all was okay, but did not expect the teacher also asked a Collection.sort () the underlying implementation is fast row or heap sort. This I really do not know, I guess that was sort heap, because the worst could soon degenerate row to O (n ^ 2), but the teacher said no, oh, the bottom row is fast because fast row can make good use of cache.

Then ask a little compiler theory, there is no depth, be escaped. After the teachers are expected to ask the best at the subject, I am not afraid to say death is the depth of pattern recognition and learning (but this course really my highest score one ah ......), Having everyone laughed, then he patted on the shoulder, a teacher said, "well, that experts coming."

The teacher looks a bit impatient, may face pressure? He asked me how to measure the complexity of the model, I said, ah, what the amount of parameters, and then say the next algorithm BP, and later asked me loss_function difference, I just finished cross-entropy, the teacher said you talk about cross-entropy and the difference between the maximum likelihood it. I was ignorant giant, deep learning as well as maximum likelihood, ah? I thought this did not used to say very clearly, a teacher Tanshou said, "Well, you see, can not tell it ~." In fact, I think of it that need it later to say, ah, according to the probability theory Yue Delai like it.

After asking during dry summer camp thing, I said I was in summer camp, where the examiner's work, then everyone laughing, before the teacher asked depth study would look a little embarrassed to look like. I explained things to do on a pile, and teachers have come back have discussed for some time, it may ultimately be the time when they were interrupted. Then the teacher said that the depth of learning, I think you should be quite clever, but there are things you do not need so much nonsense (to be seen through). The last round of public reserved raft project ending, of course I firmly oppose.

Found wandering father and mother after the end of the speed of light would go home, and several days later received a text message through.

To tell the truth, in fact, had intended to September and reported to Zhejiang University software a try, mainly that the teacher is very good camp. But later found that the school might be to avoid this from happening, issued a notice in disguise illustrates the pre-registration in September to push free equivalent qualifications Bo gave up the straight, I thought, or not reported.

 


 

Harbin Institute of Technology Shenzhen is a long, long time before the report, because it can be considered a school (does not), so very early very early to fill out the application (but later found information incorrectly, and then re-filled again, fortunately caught up last bus).

In fact, I have been thinking so far and there is a good offer up dove altogether, but the feeling when the thought is to go to Shenzhen is also worth a look, I still bought a ticket on the 19th over.

Shenzhen campus environment is really invincible good! Various hardware settings simply impress, computer room are 32G memory plus i7. Machine test system is used SSE, evoking memories of freshman C language, feeling quite familiar. Entitled 75 multiple-choice questions +2 channel programming. 75 multiple-choice questions are basically C language (not cpp! So imagine the test are C language variety show usually do not use the operation, but also heavily involved in the hook function), databases and computer networks only a small part of discrete mathematics is that only a few questions, indeed, staged a surprise to me. Two questions I do not know programming is a new play or not to drop yesterday with IDE, to write directly, really pit to me.

The final score 147/200, it is very general ranking. Another Part of the students took 160, it should be a very high score.

I could have been one person, but two happened to meet the university's side of the edge of the students. PM me and one of the students interviewed row together, so go together.

Once inside, send your resume first, then in English to introduce myself (but I heard that other groups have introduced programs to make English). Introduce yourself most of the teachers are not listening, so I guess as long as fluent in complete games do not embarrassed enough. HIT is very like to ask questions more theoretical, this is very different and Zhejiang University. Up to ask the next best projects done, let me explain after maximum likelihood (is this ......), and then asked me the meaning of matrix rank, explaining EM algorithm; during which teachers are very keen to ask me not the other schools took the offer, I hesitated to say the truth, but also to say if the offer will give priority to Shenzhen (sorry ......), anyway, so it passed. After also asked a lot of professional issues, but I do not remember, then ask other people have asked about formal languages ​​and automata, also asked a number of mathematical logic, in particular, like to ask a word to explain the theory of knowledge, it can be considered and headquarters the same strain of the ......

Finally, ask the parents work, and would be willing to special master, then it ended. I feel pretty good, to contact the teacher said not to see the Shenzhen side, instructor-mail back only three words "business trip."

The next day around Shenzhen and several classmates to play around and found this city is really no culture (sorry Shenzhen classmates) ...... all the various parks, ranked first in the "Window of the World" Although it is Jiang Jiang word problem, but there is actually a replica of the Eiffel Tower, a pyramid or something into them, we feel all mean nothing. Happy Valley where there are, we can not go, so the day was crazy to take the subway to the park all kinds of stereotyped wandering around in the end we heart Duman tired ...... a student notified by mail by the afternoon, another Unfortunately, the students did not before, but I had nothing to receive. A little later, I went directly to the airport, have to say is really modern Shenzhen Bao'an Airport is very large, designed to be great, but there are still a joy inside tea GO, many people are betting on boarding the time to line up.

Nantong aircraft in transit, open the mailbox and saw a message received by the total score 95.

To school when it is already 12.30 at night, I put together the speed of light wave on the bed.

 


 

Really not Xiangman, before also I have actually voted in the pre-computer Tsinghua push free (Behind his), but even loved to have not been audited. Later, with the summer camp acquaintances speaking, he said, you really can, and your system is said to recruit people to avoid pushing the single digits, the software may also picking leak to vote, cast your computer then it is the Warriors.

Later, I would like to change, but found Tsinghua really hard-core, confirmed the application can not be changed, so later avert, be a lesson it.

 


 

Today push-free system has been open just a few days after officially completing my security research history came to a close, and hereby record. During this time the experience has given me a lot of inspiration (because in this period I also participated Ali Huawei Tencent written interview, of course, the purpose is just to feel), one of the biggest impressions is the importance of mindset. I think if you see the article by searching, that you also have to worry about people's security research, regardless of the final outcome, which may explain the strength of your own has been very good, so we have to have confidence in the interview granted - even if unsuccessful but also how so many non-school I was not on you, and then not guarantee the school can always be right?

Of course, the written exam is also very important, but I have not seen so many Which written test scores can be higher than the interview. Regardless of how the written test (of course, must also not be too bad ah ......), I went into the interview room the moment we should be humble and confident attitude, fluent not our goal, our goal is to always have something in interviews She says, but also talking about, to put it naturally. If possible, it is best to grasp their own interview situation, do not let the interviewer riding a nose away. To do this is actually very simple, do not encounter the problem is expressed in good faith do not know, but at the same time also trying to express their own familiar issues related to knowledge; ask not good point less answer, asked the familiar to enjoy the show, do not stiff (of course, do not show off ah, most teachers said to hate this, but also keen to expose the spot) - teachers are also sensible, hard to get to know the candidates will each issue, so give them left a good overall impression is the most important.

Many people stereotype of engineering students are our talkative, are nerd, but in fact not the case, please! Many chiefs humanities are very, very high, the history of political literature can eloquence, chat with them together can really understand what is "pure joy to talk to." Also, some students think I'm not obsessed with big brother I do not deserve, so do not even enrolled. On this issue, my personal thinking is that if I was big brother that I did with, but if I'm not big brothers also picked up cheap, I will double the fun. Everything gotta go try it? So all my friends ask myself whether or not to participate in the interview XX, XX want to go to school, I have not and will answer, go! must go! Since it is an opportunity, why let go of it in their own hands?

I have always been a strong Jianlou enthusiasts, college entrance examination to fill volunteer I wish I could go in stepping score (of course I do not mean to say I want a low score ah, I mean, I hope the school can choose the perfect make good use of my score), I do not deserve all kinds of looks I like mixed race on foot, although many eventually prove nothing to do with me, but there are some really gave me picking up. Picking up other people what can feel I do not deserve it? I'm not in accordance with the normal procedure to do, but I signed up, some more powerful the students did not sign up nothing. Having said that, it is hoped that we will not miss the opportunity seemingly minor - its name is "opportunity" represents the probability that there is always a surprise for you.

Of course, this idea is not conducive to Jianlou research community development, I am here to say that it can be considered a dig pit of the stomach. But still want a word of warning, no matter how Jianlou, are based on their own strength to achieve minimum standards on the basis of, say you have not had the trial Tsinghua me how I Jianlou?

Sometimes I really think I'm a very lucky man, encountered such a good teacher, gave me so many opportunities; met so many awesome roommate, gave me a lot of sound advice; also have my family, braved the typhoon sent me to interview; from small to large I met are good people, maybe I really been blessing, but I hope this time no matter you are looking at this article anxiety or worry , do not forget as long as you are willing to lend a hand, always someone willing to help you.

 

I wish you all best for the future.

 

 

Welcome to my other one log "half Zhejiang Dream": https://www.douban.com/note/729478470/

 

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Origin www.cnblogs.com/samwoog/p/11570124.html