#import "@preview/ichigo:0.1.0": config, prob

#show: config.with(
  course-name: "SMART CARDS & NFC",
  serial-str: "k12104785",
  author-info: [
    Lukas Heiligenbrunner
  ],
  author-names: "Lukas Heiligenbrunner",
)

#prob[
  #figure(
    image("Screenshot From 2024-10-21 14-07-41.png", width: 80%),
    caption: [
      Pin try counter.
    ],
  )

][
- The PiN_TRY_COUNTER is prone to turn off attacks.
  Each time the chip resets the ram value of the counter is cleared and one gets basically infinite retries.
  todo solution
- Depending on the implementation of the comparison operation, it might leak side-channel information.
  For example, if the comparison is done byte-wise, the attacker can determine the correct byte by comparing the time it takes to compare the bytes.
]

#prob[
  #figure(
    image("Screenshot From 2024-10-21 14-10-15.png", width: 80%),
    caption: [
      Pin comparision (PIN == REF_PIN).
    ],
  )
][
  todo solution
]