DSA
as defined in Commission Decision (EU, Euratom) 2015/444 of 13 March 2015 on the security…, Article 40, point (d) (Definitions)
an authority responsible to the National Security Authority (NSA) of a Member State which is responsible for communicating to industrial or other entities national policy on all matters of industrial security and for providing direction and assistance in its implementation. The function of DSA may be carried out by the NSA or by any other competent authority.