Reverse Encryption Algorithm: A Technique for Encryption & Decryption Priti V. Bhagat Department of Computer Science & Engineering D.M.I.E.T.R. Sawangi(M), Wardha, Maharashtra, India Kaustubh S. Satpute Department of Computer Science & Engineering D.M.I.E.T.R. Sawangi(M), Wardha, Maharashtra, India Vikas R. Palekar Department of Computer Science & Engineering D.M.I.E.T.R. Sawangi(M), Wardha, Maharashtra, India Abstract - In the today’s world, security is required to transmit confidential information over the network. Security is also demanding in wide range of applications. Cryptographic algorithms play a vital role in providing the data security against malicious attacks. Encryption of data is an important topic for research, as secure and efficient algorithms are needed that allow optimized encryption and decryption of data. In this paper we propose a new encryption algorithm, called Reverse Encryption Algorithm (REA). Our new encryption algorithm (REA) is simple and fast enough for most applications. REA encryption algorithm provides maximum security and limits the added time cost for encryption and decryption. Keywords - decryption, encryption, information security, REA I. INTRODUCTION Cryptography is a science of secret writing. It is the art of protecting the information by transforming it into an unreadable format in which a message can be concealed from the casual reader and only the intended recipient will be able to convert it into original text .Cryptography renders the message unintelligible to outsider by various transformations. Data Cryptography is the scrambling of the content of data like text, image, audio and video to make it unreadable or unintelligible during transmission. Its main goal is to keep the data secure from unauthorized access [22]. Information security has been provided by physical security and operating system security. As far as we know, neither of these methods sufficiently provides a secure support on storing and processing the sensitive data. Cryptographic support is another important way of database security. In [1, 7, 12, 14] database encryption mechanism could provide the following security. 1) Encryption mechanism can prevent users from obtaining data in an unauthorized manner. 2) Encryption mechanism can verify the authentic origin of a data item. 3) Encryption mechanism also prevents from leaking information in a database when storage mediums, such as disks, CD-ROM, and tapes, are lost. This usually implies that the system has to sacrifice the performance to obtain the security. When data is stored in the form of cipher, we have to decrypt all the encrypted data before querying them. It is impractical because the cost of decryption over all the encrypted data is very expensive [18]. For this purpose, we design the innovative encryption algorithm, called as “Reverse Encryption Algorithm (REA)”. Our new encryption algorithm (REA) is efficient and reliable. It has accomplished security requirements and is fast enough for most widely used software. Reverse Encryption Algorithm limits the added time cost for encryption and decryption. We also provide description of the proposed encryption algorithm and its processes. The remainder of this paper is organized as follows. Section II discusses related work. Section III describes the proposed encryption algorithm REA. Finally Section IV presents conclusion. II. RELATED WORK International Journal of Latest Trends in Engineering and Technology (IJLTET) Vol. 2 Issue 1 January 2013 90 ISSN: 2278-621X