Design of a New Security Protocol Using Hybrid Cryptography Algorithms

Topics: Cryptography, Public-key cryptography, RSA Pages: 13 (3590 words) Published: November 19, 2012
Subasree & Sakthivel ● Design of a New Security Protocol

IJRRAS 2 (2) ● February 2010

S. Subasree and N. K. Sakthivel
School of Computing, Sastra University,
Thanjavur – 613401, Tamil Nadu, INDIA.

A Computer Network is an interconnected group of autono mous computing nodes, which use a well defined, mutually agreed set of rules and conventions known as protocols, interact with one -another meaningfully and allow resource sharing preferably in a predictable and controllable manner. Communication has a majo r impact on today‟s business. It is desired to communicate data with high security. Security Attacks compromises the security and hence various Symmetric and Asymmetric cryptographic algorithms have been proposed to achieve the security services such as Authentication, Confidentiality, Integrity, Non-Repudiation and Availability. At present, various types of cryptographic algorithms provide high security to information on controlled networks. These algorithms are required to provide data security and users authenticity. To improve the strength of these security algorithms, a new security protocol for on line transaction can be designed using combination of both symmetric and asymmetric cryptographic techniques. This protocol provides three cryptographic pr imitives such as integrity, confidentiality and authentication. These three primitives can be achieved with the help of Elliptic Curve Cryptography, Dual -RSA algorithm and Message Digest MD5. That is it uses Elliptic Curve Cryptography for encryption, Dual -RSA algorithm for authentication and MD-5 for integrity. This new security protocol has been designed for better security with integrity using a combination of both symmetric and asymmetric cryptographic techniques. Keywords: Network Security, Elliptic Curve Cryptography, Dual-RSA, Message Digest-5. 1. INTRODUCTION

Curiosity is one of the most common human traits, matched by the wish to conceal private information. Spies and the military all resort to information hiding to pass messages securely, sometimes deliberately including misleading information [12]. Steganography, a mechanism for hiding information in apparently innocent pictures, may be used on its own or with other methods.

Encryption fundamentally consists of scrambling a message so that its contents are not readily accessible while decryption is the reversing of that process[14]. These processes depend on particular algorithms, known as ciphers. Suitably scrambled text is known as cipher text while the original is, not surprising ly, plain text. Readability is neither a necessary nor sufficient condition for something to be plain text. The original might well not make any obvious sense when read, as would be the case, for example, if something already encrypted were being further encrypted. It's also quite possible to construct a mechanism whose output is readable text but which actually bears no relationship to the unencrypted original. A key is used in conjunction with a cipher to encrypt or decrypt text. The key might appear meaningful, as would be the case with a character string used as a password, but this transformation is irrelevant, the functionality of a key lies in its being a string of bits determining the mapping of the plain text to the cipher text. 1.1 Why we need cryptography?

Protecting access to information for reasons of security is still a major reason for using cryptography. However, it's also increasingly used for identification of individuals, for authentication and for non -repudiation. This is particularly important with the growth of the Internet, global trading and other activities[12]. The identity of e -mail and Web users is trivially easy to conceal or to forge, and secure authentication can give those interacting remotely confidence that they're dealing with the right person and that a message hasn't been forged or changed. In...
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