A method, device, and non-transitory computer-readable medium are provided. Responsive to the device determining that a first user is not registered in a node registry upon startup, a public key of the first user and private key of the first user are generated, and the public key is registered in the node registry. Responsive to receiving a lookup request from a securely connected computing device, a public key lookup request for a public key of a second user is sent to the node registry by the device. The device receives the public key of the second user responsive to the sending of the public key lookup request. Responsive to receiving a message for the second user and an encryption request from the computing device, the device encrypts the message using the public key of the second user to produce an encrypted message that is transmitted to the computing device.