What is the status of the designer in the face of contemporary propaganda? This problem arises from many questions such as: what are the wheels of contemporary propaganda? What are the visual codes of cyber-propaganda and their impact on Internet users? What place can we attribute to ethics when manipulation is at the heart of the image? How to divert visual codes that have already been hijacked? What means of counter-propaganda response can it propose? How does the graphic designer bring a decryption of the image accessible to the uninitiated? These questions are at the heart of this thesis.