A method includes receiving a request to initiate secure communications from a first client and authenticating the first client. The authenticating includes communicating with a second client using a second communication channel, and receiving a response from the first client, the response being transmitted over a first communication channel. The method also includes receiving a first set of message data from the first client, the first set of message data being transmitted over the first communication channel, and receiving a second set of message data from the second client, the second set of message data being transmitted over the second communication channel. The method additionally includes constructing the message using the first set of message data and the second set of message data.