Cyber Security

Where will be the cryptography after few decades? Not like in the past, modern technologies become modified very quickly. Because there are more resources to exploit in this era to make things change and modify according to the world's needs. And the whole of the world accepts that the country that has more new technological assets and people who can handle those new technologies are the key things to be a powerful country. Because of that, the same thing also will happen to cryptography. After the arrival of quantum computing, there will be a lot of changes in the computer fields. Since those quantum computers are the ones which very powerful and can go beyond any kinds of technological power now we have. So, according to those things the power of all the other assets should be modified, otherwise, there will be lots of problems. Hence there will be a new cryptography method that will be suitable for quantum computing and it will rock the world.   Elliptic Curve Cryptography ...

  N owadays we are living in an era where we can’t trust the confidentiality, integrity, authentication, and non-repudiation of data when considering the history, where there is not much need of having security measurement for the data. And the risk of data security is higher than in the World War period. In the 1990s when the internet came for commercial purposes and the start of commercial transactions over the internet there was a need of having encryption and decryption methods for the sake of the safety of these transactions. So there were a lot of algorithms are developed by different people for encryption and decryption. But nowadays people heavily use the internet, therefore the need for encryption and decryption has a very high priority. So, we have to find more securable data communication methods. This is the modern cryptographic challenge we have to achieve. Modern cryptography and its challenges I f there are no more random numbers gets as the key of a one-time pad...

  What is Privacy P rivacy is a need all of us have to have. But in the modern world, people do not care about their privacy when they using the internet and behaving. But most people do not have any idea about what is privacy and why we need privacy for our life. T hese days  it becomes a world-famous topic because of the modification of the Whatsapp privacy policy.  W e can define privacy as " the secureness of our private and sensitive information only with us by not allowing others to know, expose, observe, or reveal our secret and private things and stay free with public attention ". Privacy over the communication W hen we use the internet or tools connect with the internet we should pay more attention to the importance of privacy. Because the internet spread throughout the world, and if we lose our privacy by accidentally exposing something we do not want to expose, then it can affect our whole life and we have to face lots of embarrassing situations by others knowi...

D uring the renaissance period, most of the cryptographic methods and new cryptographic concepts are invented by different people and it made a new chapter in cryptography. At that time these methods are good enough to protect secret messages, but after one or two decades these methods became unsafe. Because some cryptanalysts successfully found a way to break these methods. Although they broke these methods, the concept of these methods never vanished and these concepts were improved through new inventions. During the time period of World War, I and World War II the significance of cryptographic methods became very high. Because both parties want to grab the secret messages which were communicated between military high-rankers and the war field. So at that time, both parties pay more attention to invent more powerful cryptographic methods. Ultimately as a result of these conditions more powerful and more reliable cryptographic methods were invented which were difficult to break . ...

I n the previous chapter, we discussed the introduction part of cryptography and we understand the eras of cryptography. Today we are going to learn about the ancient cryptography era . Greece T he “Scytale” is the first cryptographic method that we can find when we analyze history. It was used in Greece in about 500 B.C which was developed by Spartans to send and receive secret messages. It is a device like a cylinder. And a strip of parchment uses to write messages on it as wounds in parchment. Once we remove the parchment it becomes an unclear message which is difficult to understand. So, to receive the exact message we should have the same size cylinder. It is a method that is considered as a type of transposition cipher. The problem with this method is there should be the same size cylinder.                                         Figure 1 - Scytale Rome B ut we consider Caesar...