CRYPTOGRAPHY AND NETWORK SECURITY. K. Lakshmi Priya 1, P.Rubha 2,M.Niranjana 3 INTRODUCTION: ABSTRACT:

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1 CRYPTOGRAPHY AND NETWORK SECURITY K. Lakshmi Priya 1, P.Rubha 2,M.Niranjana 3 1 lakshmikpriya3698@gmail.com, 2 rubhapandian@gmail.com, 3 niranjanamurugan@gmail.com, Nadar Saraswathi College of Arts and science ABSTRACT: The arrival of the World Wide Web and the emergence of social networks, organization crossways the world produce a large amount of data daily. Information security is the most extreme basic issues in guaranteeing safe transmission of data through the web. Network security and cryptography is a subject too wide ranging to information in digital, from and to provide the security services. Cryptography is the techniques with which we can convert the message into secrete text which is not understandable to unauthorized users. INTRODUCTION: Cryptography is a concept to protect data transmission across the network.a Network Security system typically relies on layers of protection and consist to hardware components. All these components work together to increase the overall security of the computer networks. Cryptography is the converting text into secret code. The fast development of the modern internet technology and information technology and information technology root the unique, venture, schools and government department joining the internet, which cause extra criminal users to attack and destroy the network by using the fake website. Cryptography means hide secretes is concerned with encryption. Cryptography the investigation of systems for secure correspondence. It is helpful for examinination those conversations, that are identified with different viewpoints in data security, for example, verification, classification of information, non-denial and information worthiness. PLAIN TEXT ENCRYPTION DECRYPTION CIHPER TEXT K. Lakshmi Priya, P. Rubha, M.Niranjana 1

2 CRYPTOGRAPHY AND NETWORK SECURITY The testing issue is the way to successfully share scrammed information. Encode message with the unequivocally secure key which is known just by sending and beneficiary end is a remarkable perspective is to get strong to security in sensor organize. Cryptography, then, not only protects data from robbery or undulation, but can also be used for user authentication. Cryptography several categories depending upon the types of key used here. Cryptography is the fundamental platform in which modern information security, which involves the use of advance mathematical approaches in solving hard cryptography issues, has gained its grounds in the digital world. This paper surveys different system security and cryptographic methodologies.cryptography: Cryptography is associated with the process of converting ordinary plain test into jumbled text and vice-versa. It is method of storing and transmitting data in a particular from so that the only those for whom it is intended can read and process it. Cryptography is the practice and study of techniques for securing communication and data in the presence of adversaries. Cryptography consists of two basic functions that are encryption and decryption. Cryptography is basically used to hide the original image into a coded image so that unauthorized access can be prevented. To encrypt the original image secure internet of things is used. Encryption: Encryption is the process of using an algorithm to convert information to make it unreadable for unauthorized users. A procedure of changing over plain content into figure content is called encryption. This procedure requires two things-an encryption calculation and a key. Calculation implies the system that has been utilized as a part of encryption. Encryption of information happens at the sender side. Decryption: A turn around procedure of encryption is called as decryption. In this procedure cipher content is changed over into plain content. Decoding process requires two things -an unscrambling calculation and a key. Decryption is just opposite process of encryption process in which we retrieve the original image from cipher image. Key: A key is a numeric or alpha numeric document or may be a single figure. CRYPTOGRAPHY MECHANISM Plain Text: The first communication that the individual requirements to speak with the order is characterize as plain text. Cipher Text: The communication that can t be comprehended by any one or an aimless communication is the things that we call as cipher substance. plain cipher data key key text text Fig 2.Cryptograpy mechanism 1. Plain Text: It is the innovative text which has to be encrypted. 2. Cipher Text: It is the encrypted text. The texts achieve after plain text or decrypt the cipher text. 3. Key: It is a word or value that is used to encrypt the plain text or decrypt the cipher text. 4. Encryption: The method of convert the data into coded from with the aid of key is called encryption. K. Lakshmi Priya, P. Rubha, M.Niranjana 2

3 5. Decryption: The method of converting the encoded data to the individual form called the decryption. 6. Crypt Analyst: A crypt analyst is a person who is an expert in analyzing and contravention codes. ENCRYPT PLAINTEXT SECRET KEY CIPHERTEXT DECRYPT CIPHERTEXT SECRET KEY PLAINTEXT SYMETRIC AND ASYMMETRIC ENCRYPTIONS There are usually two types of techniques that are used for encryption and decryption confined data like Asymmetric and Symmetric system. Symmetric Encryption If there should be an occurrence of symmetric Encryption, same cryptography keys are utilized for encryption of plaintext and unscrambling of figure content. symmetric key encryption is speedier and less difficult yet their principle downside is that both the clients need to move their keys securities. There is only one key used both for encryption and decryption of data. It is also called as single key cryptography. It uses a single key. In this encryption process the receiver and the sender has to agree upon a single shared key. Types of symmetric-key algorithms Symmetric key encryption can use also stream cipher or block. Symmetric key algorithm in which both sender and receiver use the same key. Instance: 1. Data encryption standard(des) 2. Advance encryption standard(aes) 3. Blowfish Then the details of algorithm 1. DES: DES is symmetric key block cipher published by NIST. Advance in computing speed led sophisticated DES in the late It uses 64 bit plaintext with 56 bit key to achieve a 64 bit cipher K. Lakshmi Priya, P. Rubha, M.Niranjana 3

4 CRYPTOGRAPHY AND NETWORK SECURITY 64 bit plain text DES encryption 56 bit key 64 bit cipher text 2.AES: AES is an iterated symmetric piece figure, Which is portray as: working of AES is finished by rehash a equivalent sketched out strides different situation. AES can be a unknown key encryption calculation. AES works on foreordained bytes. EFFECTIVE IMPLEMENTATION of AES with the quick movement of computerized information trade in electroicroute, in information stockpiling and transmission, data security is turning out to be Effective Implementation of AES With the quick movement of computerized information trade in electronic route, in information stockpiling and transmission, data security is turning out to be deal more vital. In this paper we have utilized as a part of this secure a symmetric cryptographic procedure AES having 200 piece obstruct and additionally key size. ASYMMETRIC ENCRYPTIONS Asymmetric algorithm are those algorithm in which sender and receiver uses the different keys. Public keys encryption algorithm are sense that encryption and decryption keys are different. Example of asymmetric key process algorithm: 1.RSA 2. DIFFIE-HELLMAN COMPARISION OF VARIOUS ENCRYPTION ALGORITHM In the following Table, comparative study of various encryption algorithm on the basic of their ability to secure and protect data against attacks and speed of encryption and decryption. SYMMETRIC ENCRYPTION KEY SIZE IN STEPS OF DES bits 8 bits TRIPLE DES bits 8bits TRIPLE DES bits 8bits PUBLIC KEY ENCRYPTION DIFFE-HELLMAN bits 64bits RSA* bits 64bits K. Lakshmi Priya, P. Rubha, M.Niranjana 4

5 DIGITAL SIGNATURE DSA bits 64bits RSA* bits 64bits CONCLUSION: In the touchy development in the Internet, system and information security have turned into an unavoidable sympathy toward any association whose interior private system is associated with the internet. Client s information security is a focal problem over cloud. With further scientific instruments, cryptographic plans are getting more adaptable and regularly include numerous keys for a solitary application REFERENCE: 1.IEEE,School of Mathematics and Computer Science. 2. Advance in computational science technology ISSN volume 10,Indian publication IEEE journals on selected Areas in communications, secure communications K. Lakshmi Priya, P. Rubha, M.Niranjana 5