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Secure Interfacing with a Banknote Validator

Back in the late 1960’s the easy way to connect a banknote validator was to use a pulse interface as this was the way that coin mechanisms were connected. This was then improved with parallel and binary interfaces. In today’s high tech environment serial interfaces are more widely used as they give a lot more security to both the banknote validator and the host machine.


Over the last few years we have seen more and more frauds against the non-serial interfaces and would recommend that all customers do not use these outdated interfaces but instead use a serial interface to get maximum security. It is our opinion that Encrypted SSP is now necessary in this advanced technological age.

The encryption of the SSP protocol will ensure superior protection and reliability of the data, which is transferred between the validator and host machine. The encryption key is 128 bits long, however this is divided into two parts. The lower 64 bits are fixed and specified by the machine manufacturer, this allows the manufacturer to control which devices are used in their machines. The higher 64 bits are securely negotiated by the slave and host at power up, this ensures each machine and each session are using different keys. Please contact our support engineers to get full details of the features and implementation of this protocol.