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Message: <blockquote data-quote="Fox Mulder89" data-source="post: 18693200" data-attributes="member: 454953">Distributed Denial-of-service Attack (DDoS)Here’s a bookshop analogy.Imagine 100 people visit your little bookshop at the same time. Your bookshop is occupied and others can’t come in. You can’t ask any of them to leave because they don’t seem to be coming in groups. They probably don’t know each other at all. Most of them seem to be genuinely interested to buy books. Some even ask you where are the book shelved. Someone at the counter just pay you in pennies.People keep coming in and out for hours. All of them look perfectly normal. At the end of the day, you’ve only made one book sale. Remember the guy who pay you in pennies?DDoS attempts to bring a site or service down by flooding it with visitors.Symmetric cryptographySay Alice and Bob want to send each other stuff. To make sure nobody can see their stuff, they lock it with a box. They make 2 identical (symmetric) keys for the lock and meet up to share the keys beforehand.Asymmetric cryptographySharing identical keys works fine among 2 people. What if Alice want to exchange stuff with another guy named Carl, and Alice doesn’t want anybody to see their stuff too? Alice can’t use the same lock and key that she shared with Bob, else Bob can unlock the box easily!Of course Alice can share a completely new and different lock and key with Carl, but what if Alice wants to exchange stuff with 10 different people? She will need to keep and manage 10 different keys!So Alice come out with a brilliant solution. Now, she only maintains one key (private key). She distribute the same padlocks (public key) to her friends. Anyone can close the padlocks (encrypt), but only she has the key to open (decrypt) them. Now, anyone can send stuff to Alice using the padlock she distributed, and Alice no longer have to manage different keys for different people.If Alice wants to send something to Carl, she will ask for Carl’s padlock (public key) so that she can use it to lock (encrypt) her stuff and send it to Carl.The basic principle is: everyone has their own private key to decrypt message, and they will provide senders their own public key for message encryption.What is the difference between Java and JavaScript?They are not related at all.Java and Javascript are similar like car and carpet are similar. What is the difference between JavaScript and JQuery?JQuery is a library built on top of JavaScript.Javascript is the ugly nerd and jQuery is the wizard who turns him into the handsome quarterback. What is the difference between a framework and library?You call library. Framework calls you.Ian Boyd/Stack OverflowA library is a tool. A framework is a way of life.What is object-oriented programming?Objects are nouns, methods are verbs.k rey/Programmers Stack ExchangeObjects are like people. They’re living, breathing things that have knowledge inside them about how to do things and have memory inside them so they can remember things. And rather than interacting with them at a very low-level, you interact with them at a very high level of abstraction, like we’re doing right here.Here’s an example: If I’m your laundry object, you can give me your dirty clothes and send me a message that says, “Can you get my clothes laundered, please.” I happen to know where the best laundry place in San Francisco is. And I speak English, and I have dollars in my pockets. So I go out and hail a taxicab and tell the driver to take me to this place in San Francisco. I go get your clothes laundered, I jump back in the cab, I get back here. I give you your clean clothes and say, “Here are your clean clothes.”You have no idea how I did that. You have no knowledge of the laundry place. Maybe you speak French, and you can’t even hail a taxi. You can’t pay for one, you don’t have dollars in your pocket. Yet I knew how to do all of that. And you didn’t have to know any of it. All that complexity was hidden inside of me, and we were able to interact at a very high level of abstraction. That’s what objects are. They encapsulate complexity, and the interfaces to that complexity are high level.What is an application program interface (API)?At restaurants, you order food (call API) from the menu (APIs). Once your food is ready (API response is ready), the waiter will serve you the food.The basic idea is: you ask for what you want and the system returns you a response, without exposing what’s happening behind the scene.</blockquote>

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