Public Key Infrastructure (PKI) offers essential services for managing digital certificates and encryption keys for people, programs, and systems, moreover the PKI helps to provide security services such as confidentiality, integrity, non-repudiation, and authentication. The Certificate Authority (CA) is significant component in PKI; hence, this paper proposes to implement CA by NTRU public key cryptosystem algorithm, in term of key generation, signing X.509 certificates and verification of signature. Implementation has been developed using java language. Furthermore, the results have been compared with RSA in the same environment. As result of this work, NTRU can generate CA more efficiently comparing with RSA.