Abstract: 2021, Wang WY proposed a certificateless aggregate signature scheme for vehicular ad hoc network (VANET). This paper points out that Wang’s scheme cannot resist honest but malicious KGC attack, and the fixed pseudonym mechanism used in this scheme cannot meet the unlinkability requirements of sensor nodes. Aiming at the application scenario of Internet of agriculture (IoA), based on elliptic curve cryptography, this paper proposes a certificateless aggregate signature scheme with conditional privacy protection, which can effectively overcome the security defects of wang scheme. The scheme is unforgeable under chosen-message attack under the random oracle model. Compared with most existing schemes, the computation overhead and communication overhead of this scheme are reduced by at least 25%.