网络安全作文英语作文精彩20篇

“民以食为天”。食品安全（fd safet）指食品无毒、无害，符合应当有的营养要求，对人体健康不造成任何急性、亚急性或者慢性危害。“瘦肉精”事件尘埃未落，“染色馒头”“回炉面包”“牛肉膏”又接踵而来……近期食品安全恶性事件频频出现，监管到底缺失在哪儿？我们还能吃什么？食品安全成为老百姓关心的一个热点问题。请你以普通百姓的身份，给某报社写一稿件，说明这一现象，并提出你的建议。

稿件须包括下列内容：

1） 食品安全问题屡见报道；

2） 分析上述问题产生的原因；

3） 提出应对的措施。

注意：

1）词数不少于100；

2）不可逐条翻译；

3）可适当增加细节，以使连贯；

4) 开头以为你写出，不计入总词数。

As a product of modern computer and the Internet, online games have become very popular among college students. Many students have enjoyed great pleasure and satisfaction from these games. But as we see, some students lacking self-discipline are too much indulged in these games so that their health and academic performances are affected. This phenomenon has caused much worry from the teachers and parents.

However, some others argue that online games are not always harmful. They can train the ability of youngsters to respond to things quickly. Moreover, they can stimulate their imagination and their interest in computer science. More importantly, it does bring college students much pleasure and release their pressure greatly.

From my point of view, online games are a wonderful entertainment if you play them in a clever way. When they interfere too much with your study, it is better for you to give them up at once. But if you have enough self-control over them, you can certainly obtain real pleasure and benefit a lot from them.

作为现代计算机和互联网的产物，网络游戏已经在大学生中很流行。许多学生都已经从这些游戏中获得了快乐和满足。但是我们看到，一些缺乏自律的学生沉迷于网络游戏，影响了他们的健康和学习成绩，这种现象引起了许多老师和家长的担忧。

然而，有些人认为网络游戏并不总是有害的。他们可以培养青少年的快速响应能力。此外，还可以激发他们的想象力和他们对计算机科学的兴趣。更重要的是，它给大学生带来快乐并且很好地释放他们的压力。

从我的角度来看，如果你发挥他们的聪明的作用网络游戏是一个很好的娱乐。当它对你的学习干扰太多时，你最好马上放弃它。但是如果你有足够的自我控制能力，你就能得到真正的快乐，并从中受益很多。

Rock kingdom is my favorite online game.

The rock kingdom is a childrens game created by tencent, which is suitable for children aged 8 to 14. This game is mainly with their pets and other pet upgrade combat experience, full of class is the class of 100, you can also use "Locke" buy ordinary, intermediate, advanced, three kinds of guru, eleven honor the ball, star ball, demon balls, a fool, and VIP exclusive super guru ball, such as the other pet hit less blood, capture with guru ball have a chance of failure.

My pet has more than 100, of which the powerful are: the class of 100 elk, Luo Yin of grade 100, grade 100 royal griffins, class of 100 top cat, class of 100 ice wing ahriman, the class of 100 Roman abramovich, the class of 100 shaolin croak, class of 100 pirates mummies, class of 100 giant LingShi, this is my pet is better.

There are eight badges, namely eight guardians, the first one is a grass of Roland, drainage of lele, fire department koren, crains brother, stone in the department of toby, ice frozen knight, sander, lightning wings leno, deep and remote system Lucia, this is the eight badges.

Every Friday comes new pets, new tasks and new activities. Come on, look forward to it!

This is the kingdom of rock, a world full of joy, passion, and courage.

随着资讯科技的发达，电脑愈来愈普及，网络早已成为生活里不可或缺的一部份，不仅将网络多元功能发挥的淋漓尽致，更让科技与生活紧密结合，提供人们更舒适、便捷的资讯生活。只要在家轻点滑鼠，连上网络，就能“秀才不出门，能知天下事”，甚

至食、衣、住、行、育乐等生活所需，也都能一指搞定。

我很喜欢上网，也常上网，但我总是非常小心。因网络世界虽然五花八门、包罗万象，有

很多新奇的事物，不过潜藏的陷阱也很多。像木马病毒，不仅让电脑运作速度变慢，个人资料也会跟着外，重要资料也可能被盗取;还有一些不良网站，若让未成年儿童浏览，对身心造会成莫大的伤害;更有一些网络交友、线上游戏，一个不小心就可能被未谋面的网友给骗了，甚至人财两失!这样的例子比比皆是，受害者还不仅止于儿童，甚至是成年人也深受其害。

俗语：“水可以载舟，亦可以覆舟”，网络对我们也是如此，要看使用者如何拿捏了。用得好，它就会是工作与生活上的好帮手;用得不好，则很有可能会伤害自己，徒留遗憾。为了让不良网站远离我们，避免危害身心，并拒绝病毒侵入个人电脑，上网时应留意，要做到“不下载不明或非法软件、不开启不明连结、不透露个人资料、不与网友外出”，才能保护个人安全与畅游网络世界。

希望大家平时多充实网络知识与素养，可让自己无虞的翱翔于网络世界，汲取网络便捷带来的丰富资源，而不需畏惧网络陷阱了。

There is no denying that the network is a double-edged sword. In todays society, network security has caused a lot of peoples attention. The impact of the Internet on todays society is still great. Is the network better than the disadvantages, or the disadvantages outweigh the benefits? This is a thought-provoking question. First of all, the network really brings people a lot of convenience. People do not walk out, but across the world. You can also shop online, chat online, listen to songs and so on. Due to the development of the network, one thorny problem comes one after another. For example, some people are addicted to the Internet and cannot extricate themselves. In reality, the number of cases of juvenile sudden death is not the Internet spy Yu, it caused people to pay great attention to network security. But it must be said that computers are a great invention, because they can almost find what they want to find on the internet.

But also because of its development, will die, many people are too excited to play, and always sleep in the ground. So, the Internet is scary. Network security has become a concern of many people, many people issued a sincere question: "how to use the network is safe?"" I think: who has a lot to do with self-control?. Because after tiredness, proper listening to songs can relax people. But some people are unrestrained play, which not only can not play the effect, but also make people more decadent beast, this does not violate his final wishes? Some businesses invented bloody games for their own interests, but they attracted large numbers of teenagers. Theyre just looking for excitement. But this makes their physical and mental health be affected, the mind began to distort, put the Buddha himself on the scene, thus unable to distinguish the actual situation. So the network is fictional, not enough. I think we should use the network to learn knowledge, from the data of shit.

But when we look at the data, it will pop up some boring advertising, which has a great impact on us, because we are confused and curious in adolescence. But that often causes us to fall off the cliff. When this is, we should ask teachers, parents and people who trust them to help. However, the network is also wonderful, looking at how we can benefit it. For example, we can email and chat with people from other countries. We dont have to worry about language barrier and cant chat, because there are translation software on the Internet, so we can learn foreign culture. But others are worthless, in many bad information online to mislead the thoughts of others.

So the network is a double-edged sword, can help a person, but can also destroy a person, see is how we use. There are many people who have weak awareness of network security, and give their numbers and addresses to strangers on the Internet, so that criminals have the opportunity to commit crimes, but this brings hidden dangers to their own security. There are people who take pictures of others (Chou Hua) sent to the Internet, not only to the right of the parties to the portrait, but also to fight other peoples personality, but we can also find this person through the network, and to inform him to defend their interests. All kinds of software on the Internet bring convenience to us, but also bring adverse effects. Network security still has a big impact. We should pay attention to the problems of network security. You should consult the materials so that you can get better protection. The advantages of science and technology development, but also brought unknown harm. The influence of network security is very important to the development of our physical and mental health, we should pay attention to it. Let us further explore the impact of network security. Create a better and more civilized world and make our motherland stronger.

Recentlythe news that U.S attack on Chinas Internet is always exposed.And the question of how to stay online safely raises a lot of discussion in our country.As a resultin the era of rapid development of networkwe must take measures to protect our security of privacy and property effectively.

最近的新闻都揭示了美国对中国网络的攻击.如何安全地上网在我国引起了大量的讨论.结果是在网络飞速发展的时代我们必须要采取有效的措施来保护我们的隐私和财产安全.

From my perspectivein the first placewe should call attention to our personal information.Not only do we not offer them at random in some strange websitesbut we need to distinguish right from wrong among the numerous websites.Furthermoreit is inevitable that some secure anti-virus soft wares can be installed.And it will make it possible for that network can run more steadily.In addition to doing some work by ourselvesthe government needs to draw up some policies to preserve national cyber security.It involves probing for deeply rooted reasonsdevising creative solutionsdeveloping high-tech talents and strengthening the supervision.

从我的角度来看首先我们应该关注我们的个人信息.我们不仅不随随便便在一些奇怪的网站提供自己的信息而且我们需要在众多的网站之间明辨是非.此外安装一些安全的杀毒软件是必须的.这使得网络运行更加稳定.除了我们自己该做一些努力之外还需要政府制定相关政策来保护国家网络安全.这就涉及到探究深层次的原因想出有创造性的解决方案发展高新技术人才、加强监管.

Although scientists still cannot overcome the problem completelythey are studying a great deal about how to protect our national cyber security.Howeverconsciousness of cyber security should not decline.Only in this waywe just enjoy the convenience brought by the network.网络的好与坏高中英语作文

尽管科学家仍无法完全克服这个问题但是他们正在研究大量关于如何保护我们国家网络安全的办法.然而不应该放松网络安全意识.只有这样我们才能享受到网络带给我们的便利.

The language develops as the media become various, many years ago, people used the language that was very formal, because most oral language was always the same as the paper language. But as the time by, people started to use computer, they shared the information, at the same time, many new language was created. The Internet language is in favor by people, they like to use it, because it is fashionable and very appropriate to express what they mean. I like to use the Internet language, it is so new and fun, what’s more, it is convenient, like I can use the shorten words instead of the long words. The problem of the Internet language is that it is very informal, it can’t be written in the paper, it will changes as the time goes by. In my opinion, we can use the Internet language in informal occasions.

语言的发展伴随着多媒体的多样化，很多年以前，人们使用正式的语言，因为大部分口语和书面语言差不多。但是随着时间的流逝，人们开始使用电脑，他们分享信息，同时，很多新的语言被创造出来。网络语言为人们所喜爱，他们也乐意使用，因为这很时尚，也能恰当地表达人们的意思。我喜欢使用网络语言，那很新鲜和有趣，而且，也很方便，比如我可以使用短的词来代替长的词。网络语言的问题在于非常不正式，不能书面书写，网络语言也会随着时间而改变。在我看来，我们可以在非正式场合使用网络语言。

Nowadays, more and more college students are addicted to online games. Those games may be funny and exciting, but are very harmful to those addicts.

In my opinion, there are many disadvantages of game addiction.Firstly, online games take up a lot of players time for study. Many of the addicts found themselves forced to drop out of school for poor academic performance. Secondly, addicts tend to isolate themselves from the reality. Whats worse , indulging in the virtual world for a long time, they are more liable to suffer mental problem and physical collapse. Thirdly , players are exposed to too much violent and unhealthy material, which is definitely harmful to their growth.

In short,I cannot see any benefits from online games.Study should be the primary concern of college students. Therefore,I do hope they can step away from online games.

为进一步落实中央网信办、教育部等六部委下发的《国家网络安全宣传周活动方案》要求，在教育系统培育“四有好网民”，切实增强广大师生的网络安全意识，营造安全健康文明的网络环境，按照市教育工委的工作部署，天津冶金职业技术学院党委办公室于9月20日中午在校园开展以“网络安全为人民，网络安全靠人民”的网络安全宣周教育活动。

本次活动共计制作发放网络安全知识手册近千余张，通过生动有趣的漫画和内容丰富的实例，并且有党办和网络信息中心的专业教师向广大学生普及上网安全、移动网络安全、电信诈骗注意事项、法律法规等方面的安全知识。同时在学院宿舍、食堂、教学楼等人流密集的区域张贴网络安全宣传海报，利用新华社以及校园内多处电子显示屏滚动播放网络安全宣传周的动漫视频和宣传标语。为了增强宣传教育活动的交互性、趣味性，学院党办利用微信、微博新媒体平台推送网络安全周动漫视频宣传以及网络安全知识竞赛链接，加强师生网络安全知识的同时，用实际行动捍卫网络安全，维护晴朗的网络空间，传递网络正能量。

学院党委高度重视网络安全宣传周教育活动，此次教育活动增强了师生的网络自我保护意识和能力，倡议全体师生科学用网、文明用网、自觉维护网络空间，营造良好的网络氛围。

The usage of Internet becomes one of the most controversial topics in the society. As a student, I believe Internet is beneficial to me more than the way it harms me. There are many advantages for using Internet.

First, I can best use my time to find information online instead of going to different libraries. Also, the information can be dated back in decades ago. It is very helpful to use those information as reference and historical proof. In the library, it is hard to find so much "old" information. Another advantage to use Internet is that I can stay home and have a lecture online. It is much more convenience to me because I can stay warm to have class in the winter time instead of spending two hours on the bus and physically attend class. In addition, Internet provides me a better way to communicate with my friends and professors. I can get response from my professor in a few minutes instead of waiting outside of his door for hours. Some of my friends are living in a foreign countries, I can simply just drop him an email whenever I can and get a message from him very quick. It is much better than waiting for letters. Also, the email will not lose while the letter might be losing in the process of delivery.

However, there are also disadvantage of using Internet. For example, I might spend too much time on the Internet to concentrate on my study. Also, there is a chance that I am cheated because of the Internet purchasing. Last, Internet has lots of information, both helpful and harmful. There might be too much tempatation that I will access some of the harmful information I can on the Internet.Even though the usage of Internet has both positive and negative effect to me, I still consider Internet is a symbol of technology development. I believe I can use the Internet very well as long as I know how to control myself.

With the arrival of the knowledge economy age, Internet, as a new media, has come into our life. Nowadays, getting on line and surfing the Internet for information has become popular in China, especially among college students and teachers. Why is Internet getting so popular in such a short time?

The popularity of Internet results from its great convenience and easy accessibility to information. Thanks to the Internet, a world of information is just a click away. E-mail is another contributing factor to its popularity. It can transmit your letter quickly, safely and accurately. Besides, Internet has some other uses. Doctors may use it to diagnose and treat their patients by discussing or exchanging experiences with doctors in other parts of the world. Students may obtain new knowledge from a national long-distance educational system via Internet. Finally, businessman can conduct E-commerce or E-business on the net.

With so many uses and advantages, there is no doubt more and more people will be wired to the Internet-the information expressway. In short, with its high speed and efficiency, Internet will be more popular in China in the near future.

内容包含：

遵守交通规则，如走人行道/过斑马线。

别在街道上或马路上玩耍和踢球。

劝父母不能酒后驾车。

你可以适当增加内容，让短文通顺，过渡自然。

参考词汇：sidewalk 人行道 zebra-crossing 斑马线

注：第一段已给出，不计入总数

★ 范文

With more and more cars coming into our families，we are happy that it has greatly improved our life. But unluckily，it has also brought many problems，such as heavy traffic and traffic accidents.

Traffic safety is everybodys business. We must obey the rules. For example，we must walk on walk side，when we cross zebra – crossing，stop and look right and left，then go across fast. Dont play football on the road .we can tell our parents not to drink before they drive，not to run through red lights，not to talk and laugh while driving etc.

We can say cars are coming into our life，but only when everybody thinks traffic safety is everybodys business can we be safe driving on roads and walking on sidewalks.

The Internet becomes very popular in our life. It brings many advantages, but I think we primary students should keep far from the Internet.

Firstly, we should focus on our study, so we can’t spend too much time on the Internet. We can be easily addicted to it. Secondly, there is much harmful information on the Internet. They would do harm to us. Finally, surfing the Internet for too long is harmful to our eyesight.

Therefore, primary students should stay far from the Internet.

网络在我们的生活中很受欢迎，它带来了许多好处，但是我认为小学生应该远离网络。

首先，我们要潜心学习，所以我们不能花太多时间上网。我们很容易就会上瘾的。其次，网络上有很多有害信息，这些信息会对我们造成危害。最后，长时间上网会危害我们的视力。

因此，小学生应该远离网络。

[远离网络的英语作文示例

Our side of the whales, small fat everywhere, is this why? On food safety issues among this, now the children like to eat hamburgers, Fried meat, and eat bread also put tomato sauce, strawberry jam, most of them are added many additives, these additives are not required to add, including "Sudan red" incident shocked the world, it gives us great lesson, tells us that dont cry because it is delicious and unable to control his, we have to eat nutritious and clean "real good" such small fat man on the street, I believe that soon will reduce a lot of big fat man.

"To eat for a day", but many stalls boss in order to make money and put some in food is harm to human body, some people even in milk powder poisoned, because the milk powder, many healthy baby, all becomes a top-heavy "big head doll", they weigh less than the weight of newborn, I thought: these stalls selling boss how so cruel, I malicious these people die.

Later, when we eat all want to see, dont eat the poisonous food.

我们身边的大胖子，小胖子处处可见，这是为什么呢?这中间就食品安全问题，现在的小孩都喜欢吃汉堡，炸肉，而且吃面包时还要放番茄酱，草莓酱，它们大多都加了许多是亲添加剂，这些添加剂往往不是按要求加，其中就有震惊世界的“苏丹红”事件，这件事给了我们很大的教训，告诉我们不要因为好吃而控制不住自己，我们要吃有营养又干净的“家常饭”这样街上的小胖子，大胖子我相信一下子就会减少很多。

“人以食为天”，可是许多小摊老板为了赚钱而在食物中放了一些对人体有所伤害的东西，有些人甚至在奶粉里面都放了毒，就因为这奶粉，许多身体健康的娃娃，个个都变成了头重脚轻的“大头娃娃”，他们的体重比刚出生的体重还要轻，我心想：这些卖东西的小摊老板怎么这么狠心，我狠死这些人了。

以后，我们吃东西时都要看清楚，可别吃有毒的食品。

人们都常常说，网吧是一个能让买不起电脑的人们进行资料查阅，是丰富文化及技术增长等知识的场所。然而，原本“善良”的网吧却渐渐演变成了利益熏心的老板们赚黑心钱的地方，网吧门口那张“进网吧需查验身份证”及“未成年人请勿入网吧”已经如同虚设。一些贪好网络游戏的未成年人依然不受限制的进进出出，从而造成许多学生荒废学业，甚至生命陨落的惨剧。

我曾从电脑上看到过学生因沉迷网络游戏而致死于网吧的这么一个事件。事件是如此描述的：一名机智过人且健壮的少年——陈学生，自从某天迷上了电脑游戏后，便经常在电脑前，一坐就是五、六个小时，甚至通宵，经常玩至累得睁不开眼睛。如果累了，就在电脑前小眯一会儿，而后继续玩起了电脑。因此，他的学习成绩一落千丈，身体也一天比一天差。陈爸爸知道后，便马上禁止陈学生触碰家中的电脑与许多电子产品。而陈学生每次看到家中的电脑与其他电子产品，心里总像有一只猫在挠自己的痒痒，那真是心痒难耐啊。终于有一天，陈学生被他的同学们拉进了网吧，经过这次“大解谗”的陈学生一发不可收拾，每天都会偷偷去网吧，玩上五六小时的电脑。不久，压岁钱就用完了，然后又偷爸爸的钱包上网吧玩电脑；再不久，陈爸爸钱包里的钱，也快用完了……这些，陈学生的父亲也毫不知情，便无人阻止他。就这样，陈学生无法控制自己在网游的泥沼里，于是慢慢地越陷越深。一天，陈学生在网吧连续玩了两天两夜的网络游戏后，惨死于网吧的电脑桌前！

我还在电脑上看过学生因贪爱游戏而自杀身亡一个事件：某学校的韦学生，他在整天沉浸于电脑网络游戏的世界后竟然选择坠楼这一种方式结束生命。警察在坠楼处发现韦学生留下的一纸遗书。遗书上述：亲爱的爸爸妈妈、老师、和黑夜小组里的同学、朋友们，再见了！我要飞翔着去寻找我最最亲爱的朋友了。据韦妈妈韦爸爸说，所谓的“黑夜小组”就是指儿子在网吧上网络游戏时的“合作伙伴”，而“最亲爱的朋友”指的就是“魔兽世界”中的人物。

没有自制力的网络游戏爱好者太可怕了！他们轻于鸿毛的决绝，不仅抛弃了亲人、好友，更使他们璀璨的生命之花折损在那最美丽动人的时刻。我在为他们这一短暂的人生而倍感哀伤的同时，更不敢想象到那白发人送黑发人的长辈泣血心痛地哭泣……

以上这些事件仅仅只是沉溺于网络游戏而发生悲剧中的微乎其微的一小部分。其实，在我们的身边同样也经常会听到有学生因为迷上网络游戏，而父母又疏于管教，造成学习成绩直线下降、视力下降的故事。比如我，也曾有那么一段时间迷上了平板上的电脑游戏……

一次我生日，爸爸买回了一个平板，说是作为我的生日礼物，我便高兴地爱不释手，一拿到就在平板上下载游戏。下载好后，我迫不及待地点进去玩了起来。一玩，动听的音乐、优美的动画，虚拟的场景……让我心潮澎湃。之后每天回到家的第一件事情就是先玩上一段时间，从最初的十几分钟以至忘掉了时间，在家长的次次声声催促下，却依旧欲不能罢。然后导致作业做的就晚了，习题自然就不认真思考了……多时连作业的质量都保证不了，更别说保证每天八小时的睡眠时间了，当然成绩也差了许多。

网络游戏是一把双刃剑，它可以衍生出一些新鲜的事物，特别是一个个个性鲜明的动漫人物。但是我们还是作为一名学生，并且是以学养生修德的学生，同时也是处于没能完全明辨是非、自制力还很薄弱的我们来说，还是拒绝网络游戏更为妥善。

时间的长河中分配给我们的时间都是一样的，应该把我们沉溺于网络游戏的时间，用来参加志愿者活动，让我们学会关爱别人；用来参加户外运动，让我们强身健体；用于观察大自然，发现其间的美好；用来陪伴家人，与其度过难忘的时光；用来捧一本书静静地观阅，发现值得我们学习的方法；用心听一场音乐会，听见其中蕴含的妙趣……那将会是多么的美好呀。

所以，让作为学生的你我手牵手，一起来拒绝网络游戏吧！网络游戏，再见！

Teachers and parents are working together to ensure the health and well-being of all children. Schools are really safe places for children to be, and they are the heart of the community. Lets make sure they stay that way.Fortunately, schools, parents, and communities are finding practical ways to provide children the safe and disciplined conditions they need and should expect to find in school, such as by promoting smaller schools, respectful communities, fair and rigorously enforced discipline codes, teacher training to deal with violence, school uniforms, and after-school programs that keep kids productive and off the streets.We must get violence out of our schools, and we must put discipline and learning back in them

如今，互联网在社会上越来越普及，网络道德与礼貌也日益重要。网络虽是虚拟世界，但仍要讲究道德与礼貌。

在现实生活中，人们相互交往时都很注意讲文明、讲礼貌，愿意展示自己有文化、有修养、有良好品行的美好形象。

在虚拟社会中，人们交往互不谋面，可能交往的双方永远不知道对方是谁。这样，是不是就可以不讲礼貌，可以信口开河、脏话连篇呢?不能!在网络这个虚拟社会中，由于人与人之间的交往一般都是书面语言进行，所以谦和的态度、礼貌的语言、相互的尊重就显得更加重要，它会使人感到温暖亲切，能自然地拉近双方的距离，消除陌生感，从而使交往的双方友善地进行沟通。文明礼貌的言行举止会帮你在网友间架起友好交往的桥梁。

如果开口骂人，说脏话，只会使大家厌恶，觉得你没修养。这种人在社会上和网络上是没有立足之地的。据《楚天都市报》报道，荆州市有两个中学生用QQ聊天，其中一个说脏话，另一个便将他拖进“黑名单”里。那个骂人的便用“珊瑚虫”版QQ查到对方所在的网吧、机号，约上几个同学，找到他，把他活活打死了。后来被法院抓到，被判了刑。

讲道德，不仅仅涉及到不讲脏话，还必须言而有信。如果瞎回帖子，会让别人信以为真，做错事，害人害己。

另外，由于我们青少年正处于成长时期，阅历少，经验不足，在网络这个缤繁世界游历时，一定要注意树立自我保护意识，在自己的头脑里建立起“安全防火墙”，以抵御不良信息对我们的影响。标明限制信息的，如果自己处在限制区域内，一定不能进入。

再举个例子，我的几个同学在网上发现了一个打打杀杀的，叫什么《闪客快打》的游戏，打开时明明显示着“本游戏含暴力因素，未满18岁禁止进入”，但他们却固执地闯进去玩起来。由于玩多了，他们一看见同学就想冲上去打上几拳或踢上几腿，学习也直线下滑。这是多么可悲的事儿呀!我们一定要吸取教训，不看未成年人不适宜的信息，不玩不适宜未成人的游戏。

上网必须用自己注册的账号和密码，未经允许绝对不能盗用他人的账号和密码，加“好友”时要经过对方的允许与验证。别人在输入账号和密码时，要自觉回避，不能偷看，这是一种基本的美德。

别人制作的网页、动画，撰写的文字等都是制作人的知识产权，是受国家保护的，未经允许绝对不能转载，署上自己的名字。

再谈谈安全问题。目前网上有不少骗子，利用儿童的轻信和好奇心约会儿童到某地会合。这样的事儿即使你认识对方，也必须和家长商量，时刻都不能放松警惕。最重要的是，不管什么时候，都不能轻易将个人资料发布在网上。

好了!愿大家合理安排时间，在网上无忧无虑，安全地畅游!

As we all known，food safety problems are more and more popular in our

country，because more cases about food safety problem have appeared.

Firstly，As the old saying goes，the food is what matters to the people。 Food

plays an important role in peoples life。So food safety influences peoples

health and life。Secondly，some producers only think about earning money without

thinking about ensuring food safty。they produce unqualified food.Thirdly， some

food supervisory departpents dont perform their duty pletely。This behavior make

some producer ignore the safety of production.

If we want to solve problems that is illustrated former，we must call on the

supervisory department to manage the food market.And the producers must paly

their roles。 Lastly， we hope that there is law that punish illegal acts.

The so-called food safety, is the food does not contain any harmful substances to human body. If food spoilage or containing toxic substances, will bring harm to our body and even life-threatening. Food safety is about peoples life and health. Inferior food greatly endanger peoples health, light diarrhea diarrhea, or poisoning coma, moreover may cause death. Indeed, food safety is directly related with the health and quality of life of the masses. Schools around there are many small shops, the inviting "gourmet" from the fragrance, the classmates to withstand the snack temptation, you, me one yuan to buy a lot of snacks, the results some buy snacks classmates because bought not health food and have loose bowels.

Remember once I saw a news on TV: a famous yogurt brand for some reason, the expired yogurt repackage again, also good food quality supervision administration found in time, otherwise the consequence is unimaginable. Look at these factories, how hard, in order to market competition, regardless of the health of consumers.

The above examples are enough to prove that the importance of food safety, food unsafe events caused great influence to peoples life, food regulators have also been attaches great importance to this problem. Believe that relevant departments can seriously, strict management, give you a rest assured food environment. We, as a primary school student, as a member of a society, we should also be constantly improve the self-protection ability and the ego to protect consciousness, render and do our work with regulators.

所谓食品安全，就是食品里不含任何对人体有害物质。如果食品变质或者含有毒物质，就会给我们身体带来危害甚至危及生命。食品安全关乎人的生命健康。劣质食品极大得危害了人的健康，轻则拉肚子腹泻，重则中毒昏迷，更有甚者可能会引起死亡。的确，食品安全直接关系着群众的身体健康和生活质量。学校周边有许多小店，那诱人的“美食“发出阵阵香味，同学们抵挡不住零食的诱惑，你五角，我一元地买了许多零食，结果有些买零食的同学都因为买了不卫生的食品而拉肚子。

记得有一次我在电视里看到了一个新闻:某一知名酸奶品牌因为某种原因，把过期的酸奶重新包装了一遍，还好食品质量监督管理局及时发现，不然后果不堪设想。看看这些厂家，多么毒辣，为了市场上的竞争，竟不顾消费者的健康。

以上事例都足以证明食品安全的重要性，食品不安全的事件给人们的生活造成了很大的影响，食品监管部门也一直很重视这个问题。相信有关部门能够严肃处理，严格管理，给大家一个放心的食品食用环境。而我们作为一名小学生，作为社会的一份子，我们也应该要不断提高自我保护能力和自我保护意识，以及尽自己的绵薄之力配合监管部门工作。

本学期我选修了网络信息安全这门课，自从上了第一堂课，我的观念得到了彻底的改观。老师不是生搬硬套，或者是只会读ppt的reader，而是一位真正在传授自己知识的学者，并且老师语言生动幽默，给了人很大的激励去继续听下去。在课堂上，我也学到了很多关于密码学方面的知识。

各种学科领域中，唯有密码学这一学科领域与众不同，它是由两个相互对立、相互依存，而又相辅相成、相互促进的分支学科组成。这两个分支学科，一个叫密码编码学，另一个叫密码分析学。

“密码”这个词对大多数人来说，都有一种高深莫测的神秘色彩。究其原因，是其理论和技术由与军事、政治、外交有关的国家安全(保密)机关所严格掌握和控制、不准外泄的缘故。

密码学(Cryptology)一词源自希腊语“kryptos”及“logos”两词，意思为“隐藏”及“消息”。它是研究信息系统安全保密的科学。其目的为两人在不安全的信道上进行通信而不被破译者理解他们通信的内容。

从几千年前到1949年，密码学还没有成为一门真正的科学，而是一门艺术。密码学专家常常是凭自己的直觉和信念来进行密码设计，而对密码的分析也多基于密码分析者(即破译者)的直觉和经验来进行的。1949年，美国数学家、信息论的创始人Shannon,Claude

Elwood发表了《保密系统的信息理论》一文，它标志着密码学阶段的开始。同时以这篇文章为标志的信息论为对称密钥密码系统建立了理论基础，从此密码学成为一门科学。由于保密的需要，这时人们基本上看不到关于密码学的文献和资料，平常人们是接触不到密码的。1967年Kahn出版了一本叫做《破译者》的小说，使人们知道了密码学。20世纪70年代初期，IBM发表了有关密码学的几篇技术报告，从而使更多的人了解了密码学的存在。但科学理论的产生并没有使密码学失去艺术的一面，如今，密码学仍是一门具有艺术性的科学。1976年，Diffie和Hellman发表了《密码学的新方向》一文，他们首次证明了在发送端和接收端不需要传输密钥的保密通信的可能性，从而开创了公钥密码学的新纪元。该文章也成了区分古典密码和现代密码的标志。1977年，美国的数据加密标准(DES)公布。这两件事情导致了对密码学的空前研究。从这时候起，开始对密码在民用方面进行研究，密码才开始充分发挥它的商用价值和社会价值，人们才开始能够接触到密码学。这种转变也促使了密码学的空前发展。

最早的加密技术，当属凯撒加密法了。秘密金轮，就是加解密的硬件设备可以公用，可以大量生产，以降低硬件加解密设备的生产与购置成本。破译和加密技术从来就是共存的，彼此牵制，彼此推进。错综复杂的加解密演算法都是为了能够超越人力执行能力而不断演变的。Kerckhoffs原则、Shannon的完美安全性、DES算法、Rijndael算法一文，正如密码学的里程碑，伫立在密码学者不断探索的道路上，作为一种跨越，作为一种象征。

以上便是我在学习这门课中了解到的关于密码学的一些常识问题，接着介绍我感兴趣的部分。

在这门课中，我最感兴趣的莫过于公钥密码学了。其实公钥密码学的核心基础就是数学领域里某些问题的正反非对称性，如整数分解问题(RSA)、离散对数问题(DL)和椭圆曲线问题(ECC)，而这些问题无一例外地与数论有着千丝万缕的联系。伟大的数学家高斯曾经说过“数学是科学的皇后，数论是数学中的皇冠”，然而很遗憾的是，在我国的教育体系中无论是初等教育还是高等教育对于数论的介绍几乎是一片空白，有所涉及的是初高中的数学竞赛，但这种覆盖面肯定是极其有限的。本章并未对数论作完整的介绍，而只是将与书中内容相关的知识加以阐述，分别包括欧几里得定理和扩展的欧几里得定理、欧拉函数以及费马小定理和欧拉定理，其中欧几里得定理部分有比较详细的推导和演算，后两者则仅给出结论和使用方法。不过考虑到这几部分内容独立性较强，只要我们对质数、合数及分解质因数等基础知识有比较扎实的理解那么阅读起来应该还是难度不大的。而对于欧拉函数以及费马小定理和欧拉定理，其证明方法并不是很难，我们也可在网上找到相关过程;不过其应用却是相当重要，尤其是费马小定理，是Miller-Rabbin质数测试的基础。我觉得喜欢数学的同学一定会喜欢上这门课，这门课所涉及的数学知识颇为丰富，包括数论、高等代数、解析几何、群论等诸多领域。

此外，课堂上老师所讲的各种算法(如Diffie和Hellman的经典算法)影响直至今日，促成了各种新兴算法的形成，且多次地被引用。经典犹在，密码学新的开拓仍旧在继续，仍旧令人期待。

Campus Security

Security issue may sound clichéd, but when it comes to the campus security,

we have to take it seriously. Nearly every day, there are reports to the

security office on campus that valuable things are stolen away.

A surrounding with stealing, mugging can’t be worse for studying. In such

cases, what measures should be taken to improve the campus security?

On the one hand, we students should strengthen our security awareness. Once

we smell out something unusual, we should report it to the campus guard

immediately. On the other hand, more equipment such as monitors should be

installed on campus so as to detect crimes as soon as possible.

Besides, a proper amount of security guards should be arranged to patrol

the campus。

In my opinion, campus security will be improved as long as efforts are made

on campus. Therefore colleges and universities should try their best to make

everyone on campus safe and sound。