Gnuk Token is a security hardware USB token for GnuPG, which supports OpenPGP card protocol. The important feature is it avoids special thing like hardware accelerator or tool (which comes with NDA). Development environment, Tools, Firmware, and hardware design are all free, as they should be.

FST-01 was designed and used as a reference hardware implementation for Gnuk. In 2011, FST-01 was designed as free hardware design with KiCAD, so that people can use Gnuk Token for their computing, having the nature of reproducible by other parties. In 2016, we had a revision called FST-01G, following update of KiCAD. FST-01 and FST-01G were mass produced and sold more than 1200 pieces (2012-2018). In 2018, it has major update, now called FST-01SZ, using Chinese chip (GD32F103TB) and Chinese connector for USB, following another update of KiCAD. In this short talk, I will show my experience of FST-01/FST-01G/FST-01SZ, focusing new revision.