Block cipher attacks have found new aspects, due to the advancement of the technology and the development of the software and hardware tools. In many cases, the attackers try to use the weaknesses of the block ciphers implementation, instead of the theoretical cryptanalyses. Increasing the attacker’s accessibility to the details of the block ciphers implementation will increase the chance of success of his attacks. Hence, it is important to design secure block cipher schemes, those are unbreakable whether the attackers have access to the details of the implementation or not. In this paper, first we will introduce the different models of the block ciphers implementation, then we will explain the fundamental concepts of the white-box cryptography, and why it is useful. Later we will discuss several white-box schemes.

Due to the fast development in information and communication technology, new challenging problems appear in the security. So, it is important and vital that the scientific society of our country focuses on research and studies these problems and by providing new proposal try to respond to these critical needs of our country. Hence, our aim in this paper is to study and highlight one of the important problems of applied cryptography that appear recently in cryptography society but in our country, there is not much research about it. In this paper, we investigate a special and applied category of a backdoor in cryptography systems which is named Kleptography. In this paper, in addition to the investigation of the kleptographic attack, we study its application. Our purpose in this paper is to shed some new light on the kleptographic attack by studying new concepts that recently have appeared about it.