#ID-12 RFID Reader https://www.sparkfun.com/products/11827
#Sparkfun USB RFID breakout https://www.sparkfun.com/products/9963
#BeagleBone Black http://www.adafruit.com/products/1876
Strikeplate switching can be accomplished with a variety of transistors, be aware that the BBB can source relatively small amounts of current.
#Exaxmple of suitable transistor https://www.sparkfun.com/products/10213