Turnstile gate for regulating access in a transit system

A method for regulating access in a transit system, the method comprising:

• in a secured storage on a first circuit card:
• reading a set of digits from Radio Frequency Identification (RFID) credential when the RFID credential is presented to an RFID card reader;
• generating a hash value of the set of digits;
• transmitting a first bin, wherein the first bin is a subset of the set of digits;
• and
• transmitting the hash value of the set of digits;
• in a memory on a second circuit card:
• receiving the first bin from the first circuit card;
• sending validity information for a plurality of second bins to the first circuit card, wherein:
• the memory has larger capacity than the secured storage;
• the validity information indicates which of the plurality of second bins is valid;
• and
• the plurality of second bins each have a greater number of digits than the digits in the first bin;
• checking if the hash value of the set of digits is a member of a list of a hash values of a plurality of unique-identification numbers associated with a plurality of RFID credentials present in the memory, wherein the list of the hash values of the plurality of unique-identification numbers indicate a list of RFID credentials that belong to a first list;
• in the first circuit card:
• regulating opening of a movable barrier depending on if the hash value of the set of digits is on the first list;
• and
• denying the opening of the movable barrier if a second bin from the plurality of second bins corresponding to the RFID credential is invalid.

A non-transitory computer-readable medium having instructions embedded thereon for regulating access in a transit system, wherein the instructions, when executed by a plurality of processors, cause the plurality of processors to:

• in a secured storage on a first circuit card:
• reading a set of digits from Radio Frequency Identification (RFID) credential when the RFID credential is presented to a RFID card reader;
• generating a hash value of the set of digits;
• transmitting a first bin, wherein the first bin is a subset of the set of digits;
• and
• transmitting the hash value of the set of digits;
• in a memory on a second circuit card:
• receiving the first bin from the first circuit card;
• sending validity information for a plurality of second bins to the first card, wherein:
• the memory has larger capacity than the secured storage;
• the validity information indicates which of the plurality of second bins is valid;
• and
• the plurality of second bins each have a greater number of digits than the digits in the first bin;
• checking if the hash value of the set of digits is a member of a list of a hash values of a plurality of unique-identification numbers associated with a plurality of RFID credentials present in the memory, wherein the list of the hash values of the plurality of unique-identification numbers indicate a list of RFID credentials that belong to a first list, in the first circuit card:
• regulating opening of a movable barrier depending on if the hash value of the set of digits is on the first list;
• and
• denying the opening of the movable barrier if a second bin from the plurality of second bins corresponding to the RFID credential is invalid.