A smartcard communicates with a terminal using the APDU-based protocol specified by the ISO7816 standard. The goal of this thesis is to analyze possibilities for passive communication capture using a low-cost device like Arduino or Raspberry Pi and demonstrate its usefulness by adding an external display with extracted data of Bitcoin transactions.
The theoretical part will provide the background necessary to capture and decode ISO7816 communication and survey existing approaches utilized by logic analyzers, oscilloscope-based decoders, and active logging hardware or software devices. The problem of signing data with and without a trusted display will be discussed with a survey of typical solutions used.
The practical part of this thesis shall cover the following parts:

• Analyze the practical options for I/O capture and ISO7816 decoding using Arduino or Raspberry Pi.
• Evaluation of a capture method accuracy and robustness on a larger number of transmitted APDU packets and 2-3 different smartcards.
• Demonstration of a more secure Bitcoin transaction signing with JavaCard smartcard and an external display showing transaction details captured on the I/O line.

References:
ISO/IEC 7816-1:2011, Identification cards - Integrated circuit cards - Part 1: Cards with contacts - Physical characteristics standard, https://www.iso.org/standard/54089.html
Bitcoin transaction https://developer.bitcoin.org/devguide/transactions.html
L. Hrbacek: Logging and replay of smartcard communication, https://is.muni.cz/auth/th/qg0v2/