How Can I Encrypt Sign Presentation

How Do I Encrypt Sign PPT

Hey Guys, this is Ram here from EngineeringMentor.com In this video, we will talk about some of the basics of cryptography like what is cryptography and why do we need it etc. After that we will discuss the traditional cryptography model which is based on encryption and decryption of messages. So let's start. When we are talking about communication over a network we need to make sure that there is some sort of security for the information being communicated. Now a question might pop up in your mind as to why do we need this security during transmission? Let me explain this with an example. Suppose you are shopping online with your laptop and you use your credit card for payments. At this time your credit card information is sent to the server for verification. Now the server at the end of this line might provide security for your information when the information is within the server. But what about the time when it is under transmission? If there is no security here, the information is vulnerable. A hacker might easily tap out your credit card information and empty your pockets! You wouldn't want that, do you? So the information needs to be protected when it is travelling through the network. If you just think about the things you do over the internet it is easy to point out many such examples where you need security. Whether it is sending personal emails or any web transactions or confidential information being transmitted between military organizations everywhere SECURITY is an important requirement! So how do we provide this security during transmission then? Well, One way of ensuring security can be use of CRYPTOGRAPHY Cryptography is a field of network security which deals with hiding "real" infromation when it is under transmission between two parties. Usually, the real information is transformed or hidden into another message and transmitted over the network. This transformed message in itself will make no sense even if any hacker gets hold of this information. When it reaches the destination the reciepent will know a method to de-transform the garbage message into its original message which was sent by the Sender I will give you a simple Example. Let us say a boy Bob wants to send a message "I love you" to his girlfriend Alice Now he wouldnt want anyone else to see this message Let us say he uses a software to convert the message into some numbers say "143" and this software is available is only with Alice and Bob and nobody else Now 143 is sent across the network to Alice If a hacker gets hold of this message 143 he will not be able to guess what is the real information because he does not have this conversion software So the real information is safe When the message reaches Alice, she will use the same software to convert 143 to real message, "I love you" And she will be happy seeing the message,won't she!...