What is cookie privacy?

CCTV this point can be, it is a packet, each visit to the site when the browser will send cookies back to the Web site server, and the site can also arbitrarily change your machine corresponding cookies. But there is a very important information in the video does not mention: Cookies are not only one, but a Web site, so it is not accurate to compare it to the network identity card in the video. It's not your only identity on the web, it's just your unique identification on a website.

2. What's in the cookie?

Depending on the site itself, the video says the site will store important user information (what username, password, browsing record, IP address, etc.) into the cookie. In fact:

Ordinary websites don't keep important information, they just keep one of your login states, that is, you take the user name password for the token, there is the site for your decision (such as your unique logo on this site is what you visit is our server, you are using which version of our products), You don't need to care about this information, it has nothing to do with your privacy.

A literary site will encrypt this information to prevent others from falsifying the information to deceive the site.

CCTV description of the site (in the cookie Stored user name, the practice of passwords, perhaps CCTV, is extremely rare on the Internet, and may only be done by laymen or students who have just learned how to do it, such sites are extremely unsafe and your information is easily leaked, so it is less accessible.

3. Will cookies be stolen?

It has been said in the video that cookies can only be read by the site where it is placed. This is guaranteed by the browser and is an important security mechanism for browsers. If you don't think your browser can guarantee this, change it to something like IE9, Chrome, and Firefox are pretty good. So cookies are safe? Nor is it possible for cookies to be stolen during transmission and on the site side.

Let me give you a less-than-appropriate example:

We can take the user to visit the website than do you to write a letter to the website, the content of the letter can be compared to do you submit to the website of some information (such as your sex ah, age AH), cookies can be compared to do in the envelope of the sender, identify who you are. The Post office has the opportunity to steal your envelope throughout the mailing, and the site can sell your envelopes to someone else. But!!! These two parties already have the content of your letter, do you think they need to steal your envelope?

In fact, the theft of cookies generally in your use of unsafe networks (such as WiFi in public places), or a site security vulnerabilities will occur, the first occurrence of the probability is relatively low, the latter on the site caused by the impact of a lot more than cookies stolen this little thing much more, The internet company is a serious failure and will soon be blocked once it is discovered.

4, then they say what master hundreds of millions of cookies ah, and web site cloth code AH What, sounds very fierce appearance, this is how to return?

Through the above we already know that cookies are stolen is a relatively small probability of events, can not reach the level of hundreds of millions of. The variety of gorgeous data claimed in the video is actually a sales person who is bluffing, putting a very simple practical technical term on the menu.

The truth is this:

As we mentioned above, "Every time you visit a Web site, the browser will send a cookie to the Web server." So if there's a picture on my website, which cookie will the browser send when it accesses the image? The answer is to provide a cookie for the Image service website. For example, a website s page has a picture from a marketing site B, then their relationship is as follows:

When you visit the website s, you also visit the B website as a B user. You said, "I did not register on the B site Ah, how can be a B site users." Hey, don't you register, because also do not need you know, he is automatically assigned an account to you, if like s this kind of site more, b site want to between different sites can locate you, how to do? Just put the account assigned to you in a cookie in B. This is what they call a hundreds of millions of cookie. As for the code, it is actually access to the image of the coding, and may even be the page you see the ad map. You may notice that the B Web site, while getting cookies, also gets some information about whether or not privacy is involved in the website S. The general large site will only put some simple page information to B, such as what video Ah, news ah, and so on. The goal is to make advertisers more accurate ads. As for the username or password, I can only say, brother you have been fishing, the site is not possible to sell the user's password, this does not make sense, it is estimated that you are visiting what a mess of the site, cheat you fill in what User name password, and then be information sold, this and cookie Mao relations are not.

5, the Web site to do a violation of privacy? This is not easy to say, such as what you think you care about news, what toys you buy, what video you watch (Love action movies Skip) may not be considered private. But you may not want people to know what medications you've bought, or the pages that introduce treatments for certain illnesses, which are private to many people. This is the most controversial point of access tracking technology.

6, I have a neat cleanliness, do not want to be followed, then how to do? Browsers have a function that prohibits third-party cookies, and you can just turn them off and not be tracked, but!!! It is possible that some of the functions of the site can not be used. So please be careful.

7, then how can I protect my privacy do not leak it?

This topic is too big, I say a little principle:

Don't fill out any personal information on a Web page where you don't know the source. For example, the video said that know your age, gender, income and so on, in fact, you fill in the information of different websites are acquired after they have been integrated, because there are some unscrupulous companies in the market to sell personal information, They can match you by comparing data.

Sensitive information of any site do not fill out, although the big site will not actively sell your information, but the system may have loopholes, leaked out some personal information, examples of many, I will not roll.