CHAIN OF AUTHENTICATION USING PUBLIC KEY INFRASTRUCTURE

A method for sequential authentication based on chain of authentication using public key infrastructure (PKI) is provided. The method includes abutting a first wearable device belonging to a first party with a second wearable device belonging to a second party; transmitting, by the first wearable device, authentication information of the first party; verifying the authentication information of the first party; transmitting, by the second wearable device, authentication information of the second party; verifying the authentication information of the second party; authorizing electronic transaction in response to successfully verifying both the authentication information of the first party and the authentication information of the second party. Each of the authentication information of the first party and the authentication information of the second party includes information configured for authentication based on a public key infrastructure (PKI) certificate.