Body area network facilitated authentication or payment authorization

1. 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.

2. The wearable device of claim 1 , wherein the logic circuit is further operable to perform:

present the indication that the purchase transaction has been authorized on a display device coupled to the wearable device.

3. The wearable device of claim 1 , further comprising:

a display device coupled to the processor; and

wherein the logic circuit is further operable to perform:

prior to generating the modulated radio frequency signal by the wearable device, present a menu of one or more authentication options on the display device;

receive an input selecting one or more authentication options on the display device;

select an authentication option via another input; and

retrieve authentication information associated with the selected authentication option from the memory, wherein the selected authentication option utilizes the cryptographic token.

4. The wearable device of claim 1 , wherein:

the authentication information further includes at least one of: a payment card identifier, a payment card number, an account number, an account identifier, an issuer identifier, or biometric data.

5. The wearable device of claim 1 , wherein the modulated signal generator is operable to:

generate an authentication signal in response to an authentication control signal received from the logic circuit, wherein the authentication signal is a modulated radio frequency signal containing an encrypted message including information usable to authenticate that the wearable device is associated with a payment account; and

output the authentication signal from the antenna to a biological medium of a wearer of the wearable device to complete a purchase transaction.

6. The wearable device of claim 1 , wherein the wearable device is a ring, eyeglasses, a necklace, or a wristwatch.

7. The wearable device of claim 1 , wherein the logic circuit is operable to communicate with a mobile device.

8. A computer-implemented method for a wearable device system, comprising:

determining, by a logic circuit, 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, instructing, by the logic circuit, a modulated signal generator generates a modulated radio frequency signal using an encryption algorithm, wherein the modulated signal contains authentication information related to a wearable device including a cryptographic token related to the encryption algorithm;

outputting, by the logic circuit, the modulated radio frequency signal to an 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

receiving, by the wearable device, in response to the outputted modulated radio frequency signal, an indication that the purchase transaction has been authorized.

9. The method of claim 8 , comprising presenting the indication that the purchase transaction has been authorized on a display device coupled to the wearable device.

10. The method of claim 8 , comprising:

presenting, via a display device by the logic circuit, a menu of one or more authentication options on the display device;

receiving, by the logic circuit, an input selecting one or more authentication options on the display device;

selecting, by the logic circuit, an authentication option via another input; and

retrieving, by the logic circuit, authentication information associated with the selected authentication option from memory, wherein the selected authentication option utilizes the cryptographic token.

11. The method of claim 8 , wherein the authentication information further includes at least one of: a payment card identifier, a payment card number, an account number, an account identifier, an issuer identifier, or biometric data.

12. The method of claim 8 , wherein the modulated signal generator is operable to:

generating, by the modulated signal generator, an authentication signal in response to an authentication control signal received from the logic circuit, wherein the authentication signal is a modulated radio frequency signal containing an encrypted message including information usable to authenticate that the wearable device is associated with a payment account; and

outputting, the authentication signal from the antenna to a biological medium of a wearer of the wearable device to complete a purchase transaction.

13. The method of claim 8 , wherein the wearable device is a ring, eyeglasses, a necklace, or a wristwatch.