An Introduction To Encryption And Decryption

An Introduction To Encryption And Decryption CHAPTER 1 This thesis proposes a VHSIC Hardware Description Language (VHDL) design of Encryption and Decryption Algorithm for Data. In this chapter, the challenges of cryptography is firstly presented. This chapter also briefly discusses the problem definition, scope of work and the thesis objectives are also highlighted.Finally, the chapter end with the chapter organization. The dissertation presentation is provided at the end 1.1 An introduction to Encryption and Decryption, a type of cryptography Encryption and Decryption, a type of cryptography, refers to the process of scrambling information so that the observer cannot be detecting the data. Cryptographic key is a piece of data used to encrypt or decrypt to plaintext. (Alex Brennen V., 2004) The Crypto, from the word cryptographic mean is it has its origins in the Greek word KRUOTOS, which means hidden. Thus the objective of cryptography is to hide information so that only the intended recipient can read it.[2] . Cryptographic is a protocol or method of performing encryption and decryption (Alex Brennen V., 2004). There are two types of cryptographic: symmetric and asymmetric key. Figure 1.1 is example a symmetric cryptographic has a single key, which is used for both encrypting and decrypting information. Data Encryption and Decryption is a well-known example of symmetric cryptographic. In symmetric cryptographic, public-key cryptographic uses complementary pair of keys to divided the process of encryption and decryption. This process is shown in Figure 1.2. This part is discuss about the symmetric-key cryptographic only.[3]. The proposed projects is to create the algorithms where it is use to convert of information, rearranging the original massage produce output referred as ciphertext Plaintext Plaintext Ciphertext Key Figure 1.1: Symmetric Cryptographic Plaintext Plaintext Ciphertext Encryption Key and Decryption Key Figure 1.2: Public-Key Cryptographic 1.2 Problem Statement At present there are many encryption and decryption, especially in the communication system provided in a variety of application. Encryption and decryption is particularly impacted in the field of military communications and reliable security data to protection for transmitting. This ciphertext is used in the military is to send information such as direction, strategy, secret codes and other information that can not be know by the national foe during the war.[4] Creating this system is the process by which information can not be detect by the national foe. The information can not be recognizing by the national foe because this system is using the process to encrypt data and decrypt data. [4] 1.3 Scopes of Work Based on available software resources, limited time frame and expertise, this research project is narrowed down to the following scope of work: 1. The project is only to design fixed 64-bit input of data block size, 64-bit output of data block size and 56-bit of key size based on an Encryption and Decr yption algorithm . 2. The projects is limited to design, to synthesis, to simulate and to verify the design in Altera Quartus II software. Objective The project are to create a system that can protect electronic data (secret information) which Consist of encryption and decryption process and to fully design an encryption and decryption algorithm using VHDL. The objectives of this project are