The purpose of this study is to examine how data security, privacy perception, and trust influence purchase intentions in e-commerce. The research was conducted in the Arequipa region of Peru, using a quantitative approach and a non-experimental cross-sectional design. The sample consisted of 300 young consumers who frequently used online stores, allowing us to address a key segment in contemporary digital dynamics. Data were collected through an online questionnaire, and statistical analysis was performed using structural equation modelling, ensuring a rigorous analysis of the relationships between the studied constructs. The results reveal that trust is the most determining factor in purchase intentions, becoming the link that transforms perceptions of security and privacy into effective consumer decisions. Furthermore, it is demonstrated that data security impacts both direct and indirect purchasing intentions, while privacy, although not directly impacting purchasing intentions, exerts a significant influence through trust. The most relevant conclusion of the research highlights that trust is the central element in converting perceptions of security and privacy into digital purchasing behaviours, consolidating its position as a strategic pillar in the development of e-commerce.