Abstract
Today in this world of data, we transmit a huge amount of data on the network on daily basis. We are not sure that this transmission of data over the network is safe or not. This arises a need of security. We must ensure that the data that we are transmitting is secure, valid, and is reaching to its destination without getting altered. The best way to secure the data is to encrypt the data and then send it over the network. Encryption is the method by which information is converted into secret code that hides the information’s true meaning. We can use different Encryption standards(rules) to achieve this. This chapter introduces us to such various Encryption standards as such as Data Encryption Standard (DES), Triple DES and modes of operation well as some ciphers like Stream Cipher and some mathematical background, Abstract Algebra and Number Theory. This chapter will explain how the concepts are working with some easy calculations and examples. Hence, this chapter provides theoretical concepts with its working and examples which will help readers thoroughly understand how the things are working behind every encryption standard algorithm and will be able to understand the mathematical concepts.
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