The authority to administer social security for ASN (Civil Servant) in Indonesia is an important issue that must be resolved as a form of active attitude in providing certainty of rights to social security. The emergence of regulations issued by the state through its current government has resulted in a difference in the acquisition of rights to social security for ASN and which institutions have the authority to administer it. The regulations are the ASN Law and PP 70/2015. The research aims to analyse the certainty of the authority to administer and acquire social security rights for ASN based on the laws and regulations governing the implementation of social security. This study uses a juridical-normative approach and is descriptive. Based on the research conducted, the results obtained are that the authority for administering social security for ASN in Indonesia is regulated in the SJSN Law and the BPJS Law, where two BPJS are authorised to manage social security based on SJSN, namely BPJS Health and BPJS Employment. This authority can also be seen from the legal principle of Lex Specialis Derogat Lex Generalis, where the authority to administer social security for ASN must refer to the SJSN Law and BPJS Law, not the ASN Law. The Constitutional Court Number 7/PUU-III/2005 also confirms that the implementation of ASN social security, which state-owned companies previously carried out, is contrary to the 1945 Constitution and has no binding legal force. The existence of different interpretations and practices of ASN social security protection that are not following the current SJSN creates uncertainty and the potential loss of rights to social security protection for ASN, especially JKP, which was born after the enactment of the Job Creation Law and PP 37/2021.