IMAGE ENCRPTION BASED ON AES EXPANSION
CHAPTER 1
1.1 INTRODUCTION
Data that can be read and understood without any special measures is called plaintext or cleartext. Here Plain image is converted as Plaintext.The method of disguising plain image in such a way as to hide its substance is called encryption. Encrypting plain image results in unreadable gibberish called cipher image. You use encryption to ensure that information is hidden from anyone for whom it is not cipher image to its original plain image is called decryption. Figure 1.1 illustrates this.
Figure 1.1 Encryption and decryption
1.1.1 WHAT IS CRYPTOGRAPHY
To enhance the security of the data or image, code language for writing messages were used. The branch of mathematics that investigates the code languages and methods is called cryptology. Cryptology consists of two streams namely cryptography and cryptanalysis. Cryptography is a science of coding message secretly while cryptanalysis is a science of breaking codes.
Our project is concerned with cryptography. Cryptography is a science of using mathematics to encrypt and decrypt image and data. Cryptography enables to store sensitive information or transmit it across insecure networks so that it cannot be read by any one except the intended recipient.
Cryptography or Cryptology is derived from Greek kryptos “hidden” and the verb grafo “write” or legein “to speak” is the practice and study of hiding information. In modern times, Cryptology is considered to be a branch of both mathematics and computer science, and is afflicted closely with information theory, computer security and engineering. Cryptography is used in applications present in technology advanced in societies; examples include the security of the ATM cards, computer pass words and electronic commerce which all depend upon Cryptography. Cryptography embraces both cryptography and cryptanalysis. While cryptography
1.1 INTRODUCTION
Data that can be read and understood without any special measures is called plaintext or cleartext. Here Plain image is converted as Plaintext.The method of disguising plain image in such a way as to hide its substance is called encryption. Encrypting plain image results in unreadable gibberish called cipher image. You use encryption to ensure that information is hidden from anyone for whom it is not cipher image to its original plain image is called decryption. Figure 1.1 illustrates this.
Figure 1.1 Encryption and decryption
1.1.1 WHAT IS CRYPTOGRAPHY
To enhance the security of the data or image, code language for writing messages were used. The branch of mathematics that investigates the code languages and methods is called cryptology. Cryptology consists of two streams namely cryptography and cryptanalysis. Cryptography is a science of coding message secretly while cryptanalysis is a science of breaking codes.
Our project is concerned with cryptography. Cryptography is a science of using mathematics to encrypt and decrypt image and data. Cryptography enables to store sensitive information or transmit it across insecure networks so that it cannot be read by any one except the intended recipient.
Cryptography or Cryptology is derived from Greek kryptos “hidden” and the verb grafo “write” or legein “to speak” is the practice and study of hiding information. In modern times, Cryptology is considered to be a branch of both mathematics and computer science, and is afflicted closely with information theory, computer security and engineering. Cryptography is used in applications present in technology advanced in societies; examples include the security of the ATM cards, computer pass words and electronic commerce which all depend upon Cryptography. Cryptography embraces both cryptography and cryptanalysis. While cryptography
References: [3]. M. Zeghid, M. Machhout, L. Khriji, A. Baganne, and R. Tourki “A Modified AES Based Algorithm for ImageEncryption” World Academy of Science, Engineering and Technology 27, 2007, [4]