Methods and systems for establishing a shared secret using an authentication token

A method for establishing a shared secret among a plurality of devices, comprising the steps of:

• providing an authentication token;
• communicating a first character string from a remote device to the authentication token;
• processing the first character string using the authentication token to generate a second character string;
• sending the second character string to a local device;
• and
• utilizing the second character string to establish a shared secret with a remote device.

A system for establishing a shared secret among a plurality of devices, comprising:

• an authentication token;
• a local device;
• and
• a remote device,
• wherein the authentication token is used to establish a shared secret between the local device and the remote device.

A system for establishing a shared secret among a plurality of devices, comprising:

• a local device;
• a remote device;
• an authentication token;
• means for generating a first character string on the authentication token;
• means for communicating the first character string to the local device;
• means for manipulating the first character string using a predetermined function to generate a second character string;
• means for sending the second character string to the remote device;
• and
• means for matching the second character string with at least one of a plurality of predicted character string values to establish a shared secret between the local device and the remote device.

A system for establishing a shared secret among a plurality of devices, comprising:

• a local device;
• a remote device;
• an authentication token;
• means for determining a first character string using the remote device;
• means for sending the first character string to the authentication token;
• means for processing the first character string to produce a second character string;
• and
• means for communicating the second character string into the local device such that the remote device and the local device share the second character string as a secret.

A method for establishing a shared secret among a plurality of devices, comprising the steps of:

• providing a smart card;
• communicating data from the smart card to a local device;
• and
• utilizing the data to establish a shared secret between the local device and a remote device.

A method for establishing a shared secret among a plurality of devices, comprising the steps of:

• providing a smart card;
• establishing a shared secret between the smart card and a remote device;
• and
• communicating the shared secret from the smart card to a local device to establish the shared secret between the local device, smart card, and remote device.

A method for establishing a shared secret among a plurality of devices, comprising the steps of:

• providing a smart card;
• establishing a shared secret between the smart card and a remote device;
• and
• utilizing the smart card and the shared secret in transactions between the remote device and a local device.