Body area network facilitated authentication or payment authorization

A wearable device, comprising:

• an antenna;
• a logic circuit including an input interface;
• a memory operable to store authentication information;
• a modulated signal generator operable to generate a modulated electrical signal, wherein the logic circuit, the memory, the antenna and the modulated signal generator are coupled to one another;
• and
• wherein the logic circuit is operable to:
• determine based on receipt of a control signal that an authentication signal is required to authorize a purchase transaction;
• in response to the determination that the authentication signal is required, instruct the modulated signal generator to generate a modulated radio frequency signal using an encryption algorithm, wherein the modulated signal contains authentication information related to the wearable device including a cryptographic token related to the encryption algorithm;
• output the modulated radio frequency signal to the antenna, wherein the antenna is coupled to a biological medium of a wearer of the wearable device and is not in physical contact with the biological medium of the wearer, and the biological medium is operable to conduct the modulated radio frequency signal;
• and
• receive, by the wearable device, in response to the outputted modulated radio frequency signal, an indication that the purchase transaction has been authorized.