Methods and apparatus for validating wireless access card authenticity and proximity

A method, comprising:

• transmitting, by a proximity coupling device to a proximity integrated circuit card, a terminal enabler value that is a unique randomly generated value associated with the proximity coupling device, the transmitting comprising transmitting the terminal enabler value in first portions;
• receiving, by the proximity coupling device from the proximity integrated circuit card, a remote enabler value that is a unique randomly generated value associated with the proximity integrated circuit card, the receiving comprising receiving the remote enabler value in second portions;
• and
• detecting a relay attack in response to a duration between transmitting the terminal enabler value and receiving the remote enabler value being less than or equal to a minimum time threshold.

A system comprising a proximity coupling device and a proximity integrated circuit card, the proximity coupling device configured to:

• transmit a terminal enabler value associated with the proximity coupling device to the proximity integrated circuit card, the transmitting comprising transmitting the terminal enabler value in first portions;
• receive a remote enabler value from the proximity integrated circuit card, the receiving comprising receiving the remote enabler value in second portions;
• and
• authenticate the proximity integrated circuit card in response to:
• valid values associated with the terminal enabler value, the remote enabler value, and a local challenge value associated with the system, and
• a duration between transmitting the terminal enabler value and receiving the remote enabler value being less than or equal to a maximum time threshold.