International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 04 | Apr -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 3186 An Efficient Technique for Image Encryption and Decryption for Secured Multimedia Application Ashish S. Dongare 1 , Dr. A. S. Alvi 2 , Prof. N. M. Tarbani 3 1 Dept. of Computer Science and Engineering, Prof Ram Meghe institute of Technology and Research, Maharashtra, India. 23 Professor, Dept. of Computer Science and Engineering, Prof Ram Meghe institute of Technology and Research, Maharashtra, India. ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - In the recent years, Internet multimedia applications have become very popular. The rapid growth in the use of multimedia information has made the security of data storage and transmission important in avoiding unlawful, unofficial, unauthorized and illegal use. Encryption is an efficient operation to protect multimedia data secret. There are various techniques which are discovered from time to time to encrypt the images to make images more secure. Moreover, there are many image encryption schemes have been proposed, each one of them has its own strength and weakness. Innovative encryption techniques need to be developed for effective data encryption for financial institutions, e-commerce, and multimedia applications. For future internet applications on wireless networks, cryptographic coding techniques for multimedia applications need to be studied and developed. In this paper, we focus on the efficient encryption techniques for an image in multimedia applications. Key Words: Image Encryption, key Generation, Input Image, LSB. 1.INTRODUCTION There has been an explosive growth of using computers, networks, communications and multimedia applications. Multimedia data security is very important for multimedia commerce on the Internet such as video on-demand and real-time video multicast. The image encryption is widely used to secure transmission of data in an open internet works. Every data has its own unique features; therefore different data requires different type of encryption algorithm. Many of the available algorithms are suitable for textual data but they are not suitable for multi-media data such as images, videos. Moreover, traditional cryptographic algorithms which are available for data security are often not fast enough to process the large amount of data generated by different multimedia applications to meet the real-time needs. Because of the increasing demand for information security, image encryption decryption has become an important research area and it has broad application prospects. Image security is of utmost concern as web attacks have become more and more serious. Image encryption decryption has applications in internet communication, multimedia systems, medical imaging, telemedicine, military communication. Since, these images may carry highly confidential information, so these images entail extreme protection when users amass somewhere over an unreliable repository. Furthermore, when people wish to transfer images over an insecure network, then it becomes crucial to provide an absolute protection. In brief, an image requires protection against various security attacks. To make the data secure from various attacks and for the integrity of data we must encrypt the data before it is transmitted or stored. Government, military, financial institution, hospitals and private business deals with confidential images about their patient (in Hospitals), geographical areas (in research ), enemy positions (in defense), product, financial status. Most of this information is now collected and stored on electronic computers and transmitted across network to other computer. The primary intention of keeping images protected is to maintain confidentiality, integrity and authenticity. Different techniques are available for making images secure and one technique is encryption. Adopting and applying various encryption algorithms can ensure security of data from spoofing and eavesdropping from the unauthorized attacks and crypto-analyst. However, the current forms of broadcasting and delivery of multimedia data through wireless channels, are highly insecure and vulnerable due to the inherent nature open access from massive users and receivers, if not properly encrypted. Generally, Encryption is a procedure that transforms an image into a cryptic image by using a key. Furthermore, a user can retrieve the initial image by applying a decryption method on the cipher image which is usually a reverse execution of the encryption process. The diverse algorithms are accessible to encrypt information, specifically; RSA, DES, AES, etc. Cryptography is the study of transmitting secret messages securely from one party to another. It plays an important role to secure confidentiality of data while transferring data particularly via Internet. Within the context of any application-to-application communication, there are some specific security requirements Confidentiality, Authentication, Integrity and Non-repudiation. Cryptography is a method for protecting image-based secrets that has a computation-free decoding process. Now days, the security of digital images has become immensely important in many