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Abstract: FRAM is one kind of collection which American RAMTRON Corporation promotes scratches writes the number of times to be many, the read-write speed is quick, reliable high one kind of new memory. This article introduced one kind uses FRAM, the blue tooth module realizes the public transportation swipe card, the data acquisition realizes the method.

Key word: FRAM; Blue tooth module;

Introduction: Since the 1970s IC card birth, under swift development’s microelectronic technology’s lead, the IC card already penetrated into social life each corner, various cards have facilitated people’s life greatly: The bank cafeteria cards, the credit card, the public transportation uses the transportation card, goes to eat the use cafeteria card, the difference management use timecard, telephones the payment calling card which uses, in the handset uses SIM card which and so on.
A development background
The mass transit is the fundamental mode which our country residents go on a journey, but as a result of our country large population, the bus is packed like sardines frequently, the ticket seller work load is big, the working conditions are bad, the public transportation charge, gives change, the financial control and the surveillance difficulty is big to the ticket seller. If a passenger every smart card, boards time as soon as only need shake gently the card, the money for a ticket on the automatic recording, the public transportation management’s question will be supposed the edge to solve.

Two system surveys
This system utilization advanced non-contact type IC technology, the FRAM memory and the highly effective basket tooth gateway system, has provided safely reliable, the low cost for the public transportation payment, facilitates the highly effective payment pattern and the complete handling of traffic system, to enhance the public transportation profession the grade of service, sets up the public transportation profession high quality highly effective service the new image, has laid the solid technology base. At the same time, also held the card for the bank further development to expend, has created the good condition. In addition, the non-contact IC card multi-applied technology’s implementation, enables the identical IC card to be able to provide the more social services (for example ferry, subway and park admission ticket non-contact charge), achieves a card truly multipurpose, thus has the positive social efficiency and the considerable economic efficiency.

RAMTRON Corporation’s FRAM chip compares with traditional EEPROM, FLASH has does not have the time limit to scratch nearly writes the number of times, the data security higher merit, its application, caused the public transportation payment service to have the following merit:

(1) easy to operate. When the public transportation each time arrives at the station, this time (back and forth) the swipe card record may when station of arrival real-time passes to through the basket tooth gateway stands in PC machine, all operations do not need to contact, completes automatically completely by the system, does not need the personnel to interfere, reduces the labor cost.

(2) simplifies reads the card structure. The traditional plan’s data needs to preserve about at least one week, will use the basket tooth gateway later the data only to use to preserve the public transportation to go on a journey time back and forth, the data may pass to stands PC machine, will read card in the data to be possible to eliminate, because will use FRAM (for example: FM1808 and so on and the mouth series chip), the data does not need the redundant double backup, from the volume, aspects and so on cost considered that drops.

(3) reduces the data missing the probability. The data in reads the time which in the card is detained to be longer, has the probability which makes a mistake to be higher, in addition uses FRAM to save trades the record, can guarantee that the data will not make a mistake.

(4) good system openness and versatility. Through uses the good basket tooth general gateway equipment, causes the system to be possible to fluctuate nimbly conforms to the basket tooth protocol standard agreement public transportation to read the card node. Has provided the hardware foundation for the nimble network. (5) settles accounts the convenience to be simple and direct. May facilitate through the highly effective finance network system carries on the fund to settle accounts highly effective, sped up the resource flow greatly, reduced the turnover of capital time, served the further development for the public transportation payment to provide the guarantee.

Three system structures
3.1 system structure schematic drawings
3.2 system structures showed:

(1) bank bookkeeping main engine: The management card and the account file, as well as all cards and card account’s bookkeeping processing, the IC card service receives contract award processing, the IC card blacklist management and so on, may pass X.25 or the TCP/IP agreement and the public transportation company bookkeeping main engine communication.

(2) the bank outlets add the value system: Completes the public transportation IC card to open the card, the deposit as well as the daily settlement work, unites through the bank interior network and the bank bookkeeping main engine. `

(3) public transportation main engine system: Is responsible with the bank main engine’s data communication and the transaction management, as well as communication, diary, statistical management and so on.

(4) public transportation subsidiary company system: Is responsible with the public transportation main engine system’s data communication and the transaction management, including to the subordinate vehicle carrier vehicle system administration, the pilot manages, communication management, statistical management, diary management and so on.

(5) vehicle carrier vehicle charge and data acquisition system: The non-contact charge way, composes from the non-contact receiver and the corresponding communication facility, completes the public transportation IC card cutting payment, the accumulation transaction statistical data rolls by in the regulation in the car dealership to temporarily store in FRAM, then through basket tooth module when the public transportation enters the station transmits in the data system, transmits the public transportation main engine again after the network.

Four hardware compositions
4.1 computers
Main engine: 486 above types then, above memory 8M, hard disk space above 110,000,000,000,000, standard VGA color obviously, resolution 640×480, mouse.

4.2 networks
Between the bank main engine, the public transportation corporation main engine with various subsidiary companies main engine may through X.25 or the TCP/IP agreement networking, the vehicle carry the charge and the public transportation stand the data communication to use the standard the basket tooth agreement.

4.3 read-write equipments
The reader-writer uses the hardware encryption 3DES (TRIPLE DES).

4.4 smart card shapings
Uses the ordinary logical encryption card then, for example SLE4428;

Five software compositions
5.1 public transportation system function explanation
Below the system software mainly has a part of composition: The public transportation system carries the system by the vehicle, the infrared data gathering system, as well as parts and so on public transportation company information data net system compose.

1. The vehicle carries the system

The vehicle carries the system installation on the bus, use bus power source. It has the following function.

(1) vehicle carrier vehicle starting

Vehicle carrier vehicle starting, the pilot card start completes. After starting, may establish the ticket face value and the route.

(2) the vehicle carrier vehicle examination receipt cuts payment

After the customer boards, uses the IC card, in the 10cm scope, the examination receipt cuts payment. The card may place in the wallet, does not need to take out. The trading hours is short in 0.1 second.

(3) pronunciation and indicating lamp function

The normal transaction and the unusual circumstance have the different ting prompt and the indicating lamp demonstration.

(4) remaining sum demonstration

After each time the examination receipt cuts payment, has the card remaining sum demonstration. (5) against collision function (automatic resolution function)

When many cards simultaneously enter the control region, the vehicle carrier vehicle can prompt can only a card enter, when a card completes the operation not to leave the control region to have another card enters, then this card cannot before the card be influential. The read-write machine and afterward card transaction, leaves the read-write area until the first card will not be a card.

(6) the pilot card settles accounts

When the pilot changes shifts every day, settles accounts this aircraft’s income total with its pilot card, people of total, bus permit people of number, as well as settlement time, serial number, information and so on pilot number.

2. Data acquisition system

(1) blacklist downloading

Public transportation information system downloading from the bank blacklist data, the transmission mode uses the basket tooth agreement transmission. (2) blacklist installment

When the public transportation starts out, carries on the renewal to the vehicle carrier vehicle blacklist through in the basket tooth module and bus stop’s PC machine.

(3) vehicle carrier vehicle basket tooth data acquisition

Carries on gathering to the vehicle carrier vehicle transaction detailed data.

(4) trades the data transmission

In the vehicle carrier vehicle the FRAM data delivers through the basket tooth module to the public transportation stands in the PC system, delivers the public transportation main engine and the bank backstage main engine again by way of the public transportation company information network system on.

3. Public transportation company information network system

This system of subsidiary company system and corporation system composition. Carries on the data transmission through high speed MODEM.

5.2 round of card systems and design
In must contacts in the IC card application system, sends the card system’s security and the management mechanism, is affecting overall system’s security. The bank distributes the IC card in the specific range, how safely the control and does the tube haircut card application system, then become the IC card application system security the key.

This IC card sends the card system, uses the centralized management the way, uses the hardware encryption memory regarding the main key’s safe memory. Sends the card system core key’s transmission also to use 3DES the way to realize. Thus had guaranteed entire sends the card system key’s security.

1. Sends the card system explanation

(1) sends the card system structure explanation

(2) main key production

Inputs by the multi-people sends the card main key. Main key by way of factory key (Manufacture Key) after the 3DES encryption, transmits to the non-contact card reader, and in the card reader interior after the 3DES decipher, deposits in encrypts in the memory chip. The main key contains the following key: ① ISSUER KEY: The publisher key, uses in the systems control.

② UPDATE KEY: Individual information revision key, uses in revising individual message control.

③ DEBIT KEY: The wallet cuts payment the key, uses in the examination receipt cutting payment.

④ CREDIT KEY: The wallet deposit key, uses in the wallet deposit.

(3) sends the card procedure declaration

① Uses sends the card management card start to send the card system.

②The input card number and so on sends the card information.

③ Card reader read card series number (Card Serial Number)

④ In the card reader, carries on processing according to the card series number to each host key.

⑤ Read in the card the key processing result and the data.

⑥ The card original state to must begin using the condition.

5.3 system safety explanations
This system IC card off-line expense’s characteristic, causes its secure control appears especially important, in this system’s safety performance design, has mainly considered the bank backstage safety control, the transaction authentication and so on a series of measures.

1. Bank backstage safety control mechanism

In order to guarantee that system’s security, the non-contact IC card’s wallet deposit uses on-line transaction the way, and deposit key depositing in the bank backstage’s security chip, each time the deposit transaction carries on by the bank main engine the verification, has prevented the forge deposit phenomenon occurrence effectively.

2. Transaction authentication

In this system, vehicle carrier vehicle when carries on the examination receipt cuts payment, uses 3 time password the bidirectional authentication (to conform to ISO the DIS9789-2 request). All data have the 16BIT CRC verification.

3. Network system information security in this IC card network system’s information security control, what uses is MAC (Message Authentication Code) verifies the technology, guarantees the transaction information the integrity and the uniformity.

4. Blacklist management

The blacklist management is refers to when IC card processing to blacklist card information processing, as a result of the IC card in the public transportation system’s massive off-line expense transaction, causes the blacklist the management appears especially important, on the vehicle carrier vehicle must preserve the newest blacklist information, as stated above, the blacklist management has selected on-line downloading method.