jerry871002 / nfc-ticket-app Goto Github PK

Bugs that appear

While issuing tickets, when the remaining ticket number was 8, it jumped to 15 (it should be 13).

What to show in the demo

• Memory layout
  • Explain what will happen in issuing and validating (block by block)
• How we generate the key
• Explain the security features
  • Why make read and write protection

Advices

• Use a different MAC key for each card: derive from a different master secret
• The transaction page is not needed. You can know if the previous transaction succeeded by the counter value
  • Double-tapping information can be stored on the reader
• Set expiration time on first use
• Is the last check-in time needed in MAC computation?
• Expiration time field takes too much space
  • Can use, for example, seconds pass since 2023/1/1 instead of 1970/1/1
• Only use part of the MAC computation result for better latency
• Write as few pages as possible, avoid the possibility of tapping
• Check everything is okay and increase the counter on using

Maybe create a doc/ folder and add the documents there.

Documents to be added

• Memory layout (xlsx file): @429AU
• Flow chart (handwritten file): @jerry871002