Cryptography applications on the image in digital forensics

In the nowadays, with using of computer technology excessively, the necessity of secure information is increasing importantly day by day. This thesis is about cryptography and steganography which are generally related to security of information. In this thesis, the subjects of the cryptography which is known as a code producing science and steganography which is the important branch of hiding data are mentioned. Firstly, The basic concepts, the significant components and some forms of cryptosystem are analyzed. Then, stenography is explained shortly. In the most important part of this thesis, in the practice part, It is benefited from the subjects of coding and hiding data which are generally mentioned alternative to each other for providing secure information in the literature. In these developed technics, for this time these concepts are used together for completing each other, not being alternative. In this thesis, except for this technic, it has important contribution that security of data, both of these technics are coded with visual C# for developing new methods from the aspects of data encryption and data hiding. Applications developed as a result of hidden data into digital image every time different and random points are hidden and then hidden data have been decrypted and original data is reached.