As bar codes are used for offering more information to the user about the product, service or project, great attention has been given to designing bar codes. That is why ways to personalize bar codes are found in order to attract consumers’ attention to scan that information. Unlike innovations in designing bar codes known until now, in this dissertation a new principle is proposed which enables the creation of two different messages. The principle implies the design of two dimensional matrix bar codes by using masks, a matrix with which the desired graphic pattern is made. With the stated principle it is possible to embed two different messages in one bar code symbol, one visually readable by the user, and the other one by the computer. The feasibility of the principle is proven by conducting several researches from which results is possible to conclude that this kind of principle could be used for creating a new bar code symbology. Masks which represent one of the main methods that enable this principle, do not represent images but information and therefore mask does not violate the reliability of the encoded message. Because of its characteristic, a set of masks are made that are as similar as possible to one another in order for the user to recognize the same graphic pattern. Linear binary block codes ensure a reliable and safe message reading. By using the whole surface of a bar code for design, the stated principle enables the user of a graphic pattern a great influence on the new symbology’s final appearance. Also a new level of visual and cognitive communication between bar codes and users is achieved which can greatly increase the use of bar codes in practice. By using the proposed principle, messages can become more meaningful and creative than with bar code innovations known until now.