NV11 Manual Set – Section 5 5
Copyright © Innovative Technology Ltd 2012 GA963-2
5.2 Configuration Card Programming
It is not possible to program the NV11 by the use of a configuration card as this
method of programming is not yet implemented. Full details on programming the
NV11 validator using software can be found in Section 3 of this manual set (ITL
Software Support Guide).
5.3 SSP and eSSP
Smiley
®
Secure Protocol (SSP) is a secure serial interface specifically designed to
address the problems experienced by cash systems in gaming machines. Problems
such as acceptor swapping, reprogramming acceptors and line tapping are all
addressed.
Encrypted Smiley
®
Secure Protocol (eSSP) is an enhancement of SSP. eSSP uses the
same 16 bit CRC checksums on all packets as SSP, but also uses a Diffie-Hellman key
exchange to allow the host machine and validator to jointly establish a shared secret
key over an insecure communications channel. The encryption algorithm used is AES
with a 128-bit key; this provides a very high level of security.
The encryption of the SSP protocol ensures superior protection and reliability of the
data, which is transferred between validator and host machine. The encryption key is
divided into two parts:
The lower 64 bits are fixed and specified by the machine manufacturer allowing
control of which devices are used in their machines.
The higher 64 bits are securely negotiated by the slave and host at power up,
ensuring each machine and each session are using different keys.
The interface uses a master-slave model; the host machine is the master and the
peripherals (note acceptor, coin acceptor or coin hopper) are the slaves. Data transfer
is over a multi-drop bus using clock asynchronous serial transmission with simple
open collector drivers. Each SSP device of a particular type has a unique serial
number; this number is used to validate each device in the direction of credit transfer
before transactions can take place.
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