Fibonacci Based Text Hiding Using Image Cryptography Manoj Mukherjee and Debabrata Samanta Email: manoj.mukherjee@ymail.com, debabrata.samanta369@gmail.com Abstract—In digital word security is a most important issue and data hiding with image cryptography is one of the possible ways to ensure the security of the important message from outer world. In this paper we proposed a novel technique that encrypted the message such a ways that the message encoded as well as hidden in an image. The proposed solution is to use image cryptography to hide textual message. The proposed technique use of an encryption technique that is based on Fibonacci series & image encryption and a secret key generated from the image. Index Terms—security, image cryptography, encryption technique, Fibonacci series, image encryption, secret key. I. INTRODUCTION Security is a most important issue in communication and encryption is one of the ways to ensure security of the communicated message. Encoding is the transformation of data into some unreadable form. Its purpose is to ensure privacy by keeping the information hidden from anyone for whom it is not intended. Decoding is the reverse of encoding; it is the transformation of encrypted data back into some intelligible form. Cryptography is popularly known as the study of encoding and decoding private massages. In cryptography, encryption processes are used in transforming information using an algorithm to make it unreadable to anyone except those possessing special knowledge, usually referred to as a key. The result of the process is encrypted information. The reverse process is referred to as decryption [1]. Steganography, which literally means “covered writing", Steganography is the more conservative steganography are well known and widely used techniques that manipulate information (messages) in order to cipher or hide their existence. These techniques have many applications in their Computer science and other related fields: they are used to protect e-mail messages, credit card information and etc. Steganography [3].Cryptography and steganography are well known and widely used techniques that manipulate information (messages) in order to cipher or hide their existence. These techniques have many applications in their Manuscript received January 6, 2014 ; revised August 1, 2014. Computer science and other related fields: they are used to protect e-mail messages, credit card information and etc. The proposed solution is to use image cryptography for disguising encrypted or normal textual information. This is a hybrid technique that inherits features from steganography and cryptography. Data hiding is a method used for hide information within computer code. By hiding the data, it's much harder to crack the code, because the data will appear invisible to the objects and the hacker. A. Image Processing It generally refers to processing of a two-dimensional picture by a digital computer.A digital image is a representation of a two-dimensional image as a finite set of digital values, called picture elements or pixels.Pixel values typically represent gray levels, colours, heights, two major tasks  Improvement of pictorial information for human interpretation  Processing of image data for storage, transmission and representation for autonomous machine perception. Where image processing ends and fields such as image analysis and computer vision start. Our proposed method is one of the techniques used to encrypt the images by dividing the original image into transparencies. The transparencies can be sent to the intended person, and at the other end the transparencies received person can decrypt the transparencies using our decryption method and key image, thus gets the original message. B. Image Stenography Steganography is the art and science of invisible communication. This is the hiding information in other information, thus hiding the existence of the communicated information. Steganography is derived from the Greek words “stegos” meaning “cover” and “grafia” meaning “writing” defining it as “covered writing”. In image steganography the information is hidden exclusively in images [4], [5].Extremely difficult to detect, a normal cover message was sent over an insecure channel with one of the periods on the paper containing hidden information. To ensure the security of the important message in communication, by the data hiding with image Lecture Notes on Information Theory Vol. 2, No. 2, June 2014 172 ©2014 Engineering and Technology Publishing doi: 10.12720/lnit.2.2.172-176 technology to hide any secret information within an image. Steganography [2]. Cryptography and [18]. Then the image processing focuses on opacities etc Acharya Institute of Technology, Department of MCA, Bangalore, India