Journal of mathematics and computer science 11 (2014), 147-158 An Application of the Crystography Hacı AKTAŞ 1 , Mehmet KALKAN 2 1 Erciyes University, Kayseri 2 Nevşehir Hacı Bektaş Veli University, Nevşehir. 1 haktas@erciyes.edu.tr, 2 mhmtklkn@yahoo.com Article history: Received May 2014 Accepted June 2014 Available online June 2014 Abstract A combination of cryptography and steganography is very important to information safety. Because together, they will not only hide but also encrypt the information at the same time. In the most crystographic studies, they hide the cipher text (encrypted) into the image, video or audio files to transfer. In this paper, we will give a simple and more convenient example for Crystography. We can also say that this method is applicable for most of the cryptographic algorithms to transfer them to the crystographic algorithm. As a simple example, it can be applicable for ATM card passwords etc. And then we have created and applied our method by using C# program language. Keywords: Cryptography, Steganography, Pi, Crystography. Categories: SD E.3, SD D 4.6, SD H. 2.5 1. Introduction Cryptography is a collection of mathematical methods which transforms information from readable form to unreadable form. It is called encryption. A modern cryptographic systems are designed around computational hardness assumptions and must provide five main conditions; confidentiality, authentication, integrity, un deniability and access control. There are many appliction of cryptography [15,18, 20]. Steganography is a tool for communication that transfers confidential information over an open communication channel. It allows users to transfer information hidden in the plain text, pictures, audio or video files. To do this, it is not required any changes in the text to be hidden. Thus, the hidden data can be maintained and other people cannot be able to access the content. Steganography differs from cryptography in this aspect [2,5, 6, 7,9].