Abstract: The article analyses the idea of existential bases of human identity in the context of technological challenges of modernity. Its temporality, ecstaticity, and connection of an individual being with being of Others are viewed as identity bases. Attention is paid to the existential meanings of mortality and temporality of the Other, expressed in ontological moods of pain and anxiety. These moods are defined as bases of authenticity in various socio-cultural identifications. The specifics of modernity are defined in line with M. Heidegger’s philosophy of technology, i.e. in domination of a particular way of being of humans – Gestell. Anthropological risks and challenges of modernity are shown as a possible en-framed attitude towards any self-identifications. In terms of theory and methods, the article is based on a criticism and development of M. Heidegger's ideas related to the project of existential analytics and philosophy of technology. The novelty of this research consists in an attempt to apply M. Heidegger’s theory and methods of philosophy to human identity, making it possible to view it from an existential standpoint and including an ontological view of the moods, not just related to one’s own mortality, but also mortality of the Other.