SECURITY AUTHENTICATION METHOD, APPARATUS AND SYSTEM, AND ELECTRONIC DEVICE AND STORAGE MEDIUM

A security authentication method, apparatus and system, and an electronic device and a storage medium. The security authentication method is applied to an external device, and the method comprises: accessing a host and acquiring a target port of the host, wherein the target port is configured for communication between the external device and a host device; if an authentication request, which is issued by the host, is not received by means of the target port, refusing to access a target command, which is configured and issued to the external device by the host; and if the authentication request, which is issued by the host, is received by means of the target port, determining, on the basis of the authentication request, whether to access the target command. La présente invention concerne un procédé, un appareil et un système d'authentification de sécurité, ainsi qu'un dispositif électronique et un support de stockage. Le procédé d'authentification de sécurité est appliqué à un dispositif externe et le procédé