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encryption was added to certain commands so that it could be made more resilient against attacks on the bus. Each peripheral has its own unique DES key, which it communicates to the Game
Machine on a "trusted key exchange mode". Key rotation is available. The intention is that cracking one peripheral
730:
The ccTalk commands implemented in this device are the ones reported on the document "List of the commands of the ccTalk protocol for the
Italian market", law 289 - comma 6", which specifies the ccTalk Italy package of commands currently in use (see "ccTalk Italy communication protocol"), but
395:, driven through an open-collector NPN transistor. The pull-up resistor at the host pulls the DATA line to +5 V, so logical 1 (and idle) is nominally +5 V, and logical 0 (and start bit) is nominally 0 V. For longer distances, CPI recommends sending ccTalk data over a balanced multi-drop
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does not compromise the whole system, and that a cracked one could change its keys. DES is considered insecure right from the start due to the small key size and has been further analyzed, but it does slow down fraudsters who might insert devices to tap onto the communication wire.
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technology, a simple-to-understand packet structure, an easily expandable command interface and no licensing requirements. The latter affords the protocol a good deal of popularity in a crowded and highly competitive field similar to open-source software.
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for coins and banknotes found in a diverse range of automatic payment equipment such as transportation, ticketing, payphones, amusement machines, and retail cash management use ccTalk to talk to the host controller. The ccTalk protocol is an
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Secure peripherals require all bytes of a message to be encrypted, except for the first two bytes—the destination address byte and the data-length byte are never encrypted to allow standard and secure peripherals to be mixed on the same bus.
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modified so as to make the peripheral compliant with the new security requirements established by the document "Technical Table Report 2012, 3.3, 2nd edition - Peripheric 27.02.2013", to which the reader is referred for details.
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and is ‘multi-drop’ i.e. peripherals can be connected to a common bus and are logically separated by a device address. Each peripheral on the ccTalk bus must have a unique address. The original protocol operated at 4800
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The total length of a message packet can range from a minimum of 5 bytes (data-length byte equal to 0) to 260 bytes (data-length byte equal to 255). Longer transfers require a series of message packets.
331:
with subsequent releases standardising on 9600 baud. Low cost bridge chips are now available from a number of manufacturers to allow ccTalk to run over USB at baud rates of at least 1 Mbit/s.
554:
A number of associated standards have emerged over the years from within the ccTalk specification. For example, the global tags to identify the world’s forever changing coins and notes.
315:
mainly by
Engineer Andrew William Barson. The first release of the protocol was in 1996. Coin control would later be renamed Money Controls and from 2010, Crane Payment Solutions.
546:. The use of DH prevents eavesdropping of the key exchange, while AES is still unbroken – meaning an impossibly long brute-force process would be required.
584:
Bank notes follow the same pattern but 4 characters are allocated to the value and there is an associated scaling factor, usually x100, with the country.
73:
384:
Many devices have single electrical connector that carries both power (typically +12 V or +24 V) and the ccTalk data over a total of 4 wires.
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The protocol uses an asynchronous transfer of character frames in a similar manner to RS232. The main difference is that it uses a single
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for use in all AWP machines with serial coin acceptors. (The other is the Host
Intelligent Interface protocol developed by
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open-collector interface: both transmit and receive messages occur on the same bi-directional serial DATA line at
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To reduce cost, for short interconnection distances CPI recommends sending ccTalk data over an unbalanced
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data line for half-duplex communication rather than separate transmit and receives lines. It operates at
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377:. The series of bytes in a message—represented above as a series of decimal numbers—is transmitted as
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567:. The issue code is assigned to different issue dates or special mint variations of the same coin.
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32-bit processors. The protocol supports all standard operations for electronic devices such as
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This is a message from address 1 ( the host ) to peripheral address 2 to find out what it is.
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A much stronger encryption protocol is found in
Italian NewSlot machines. This scheme uses
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307:). It was developed at a company called Coin Controls (hence "cc") on the outskirts of
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upgrading of firmware, secure transfer of data and detailed diagnostic information.
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560:<2-letter country code><3-digit value><1-letter issue code>
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The reply from address 2 back to address 1 identifies it as a coin acceptor.
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ccTalk protocol stacks have been implemented on a range of devices from tiny
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RX data = 1 13 2 0 67 111 105 110 32 65 99 99 101 112 116 111 114 22
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https://web.archive.org/web/20070329093914/http://www.cctalk.org/
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protocol in widespread use throughout the money transaction and
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627:"ccTalk Serial Communication Protocol: Generic Specification"
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In ccTalk a coin has a 6 character identifier of the format
661:""DES Encryption for Coin Acceptors and Bill Validators""
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8 = checksum ( 2 + 0 + 1 + 245 + 8 = 256 = 0 mod 256 )
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245 = command header ‘Request equipment category id’
518:22 = checksum ( sum of all packet bytes is zero )
399:driver interface, also nominally +5 V and 0 V.
8:
89:introducing citations to additional sources
50:Learn how and when to remove these messages
711:"HOPPER CD ccTalk + AES Operator's Manual"
299:ccTalk is one of 2 protocols specified by
464:Learn how and when to remove this message
260:Learn how and when to remove this message
242:Learn how and when to remove this message
79:Relevant discussion may be found on the
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360:Advantages of ccTalk include low cost
178:Please improve this article by adding
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642:
7:
515:67…114 = ASCII for ‘Coin Acceptor’
14:
31:This article has multiple issues.
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411:An Example ccTalk Message Packet
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72:relies largely or entirely on a
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39:or discuss these issues on the
686:""DES Encryption for Hoppers""
305:Mars Electronics International
1:
563:The country code conforms to
180:secondary or tertiary sources
540:Diffie–Hellman key exchange
439:. The specific problem is:
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435:to meet Knowledge (XXG)'s
594:GB0020A Great Britain £20
591:US0001A United States $ 1
373:The ccTalk protocol is a
577:GB010B Great Britain 10p
574:US025A United States 25c
503:1 = destination address
480:2 = destination address
476:TX data = 2 0 1 245 8
375:byte-oriented protocol
167:relies excessively on
320:two-way communication
550:Coin and Note Naming
446:improve this section
85:improve this article
483:0 = zero data bytes
632:2017-10-16 at the
509:2 = source address
506:13 = 13 data bytes
486:1 = source address
289:currency detectors
761:Network protocols
526:Secure extensions
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428:This section may
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688:. Archived from
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663:. Archived from
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649:"Money Controls"
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512:0 = reply header
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441:Use hexadecimal.
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339:microcontrollers
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720:. June 28, 2019
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232:November 2020
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187:Find sources:
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165:This article
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141:November 2020
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74:single source
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722:. Retrieved
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694:. Retrieved
690:the original
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669:. Retrieved
665:the original
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444:Please help
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349:to powerful
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324:TTL voltages
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636:. Issue 4.7
448:if you can.
285:Peripherals
755:Categories
696:2017-08-08
671:2017-08-08
602:References
389:multi-drop
309:Manchester
283:industry.
202:newspapers
169:references
111:newspapers
36:improve it
530:In 2010,
393:TTL level
341:with 512
336:Microchip
81:talk page
42:talk page
718:Alberici
630:Archived
565:ISO 3166
454:May 2023
430:require
191:"CcTalk"
100:"CcTalk"
766:Vending
544:AES-256
432:cleanup
369:Details
313:England
216:scholar
125:scholar
724:13 May
397:RS-485
277:serial
273:ccTalk
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714:(PDF)
587:e.g.
570:e.g.
379:8-N-1
355:flash
343:bytes
301:BACTA
275:is a
223:JSTOR
209:books
132:JSTOR
118:books
726:2023
542:and
362:UART
351:ARM7
329:baud
195:news
104:news
532:DES
347:ROM
345:of
171:to
87:by
757::
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641:^
609:^
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48:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
