US Patent 11792187 Multi-person authentication

A system includes a multi-person authentication server which receives an authentication request corresponding to a request to provide a first user access to a secure server. In response to the authentication request, a challenge-response message is provided to the first user device. A push notification is also provided to a second user device. A response to the challenge-response message is received from the first user device. If the received response indicates the first user is authenticated, the first user is allowed to access the secure server. If the received response indicates the first user is not authenticated, the first user is prevented from accessing the secure server.