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Document Reference No.: FT_000062
USB-Key Datasheet Version 1.00
Clearance No.: FTDI# 41
3
Application Examples
Numerous examples showing how to access the unique FTDIChip-ID? number is given in
many different software languages on the FTDI website at
http://www.ftdichip.com/Projects/FTDIChip-ID.htm
3.1 Security Dongle Using SafeGuard-IT
SafeGuard-IT is an ActiveX control for Windows which works with the FTDI_USB_KEY to
provide security dongle functionality. The SafeGuard-IT component works by exploiting the
FTDIChip-ID? feature of the FT232R within the FTDI-USB-KEY together with an asymmetric
public-private key encryption scheme.
The SafeGuard-IT security scheme works as follows:
1. Generate a public-private key pair using the SafeGuard-IT ActiveX control. These keys should be
saved to files.
2. Encrypt the FTDIChip-ID using the private key and an optional password. This encrypted
information is then stored in the FTDI_USB_KEY.
3. Distribute the programmed FTDI_USB_KEY with the application software. The Safeguard-IT DLL
file and the public key are also required by the application software.
4. When the application software is loaded, it can use the SafeGuard-IT control to verify that the
required FTDI_USB_KEY device is connected to the client PC. This can be used to prevent
software from running if a licensed dongle is not connected.
The SafeGuard-IT ActiveX control and SafeGuard-IT.dll are available free from the FTDI
website http://www.ftdichip.com/Projects/SafeGuard-IT/SafeGuard-IT.zip
Copyright ? Future Technology Devices International Limited
5
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