Since 1998, Enem has established itself as one of the main instruments for assessing not only basic education, but also candidates seeking university entrance. One of these assessments concerns the level of proficiency in reading and writing, skills that Enem assesses when it asks you to write an essay. One of the criteria included in the exam's assessment matrix refers to the candidate's authorial investment. Therefore, the student's ability to exercise authorship in the essay, positioning themselves in relation to the proposed theme, is assessed. After all, the text instantiates the candidate's place of saying and reflects their convictions about the world and culture, in an enunciative space in which, despite the artificial nature of the production context, they claim to be the author. This work is based on the concepts of authorship elucidated by Michel Foucault, Roland Barthes, Mikhail Bakhtin and other authors such as the Brazilian Sirio Possenti and his notion of signs of authorship. These notions contributed to the construction of a specific assessment matrix whose criteria serve to investigate the authorial and identity marks left in the text by the candidate.