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.