Home▸Cybersecurity▸NFC Tap-to-Pay Cryptogram Engine (2D)

NFC Tap-to-Pay Cryptogram Engine (2D)

Interactive 2D simulator of the dynamic cryptogram protocol behind Apple Pay / Google Pay tap-to-pay: watch a device-bound key and a monotonic transaction counter generate a single-use cryptogram per tap, drag/zoom the diagram, and see why replaying a captured cryptogram is cryptographically rejected.

Cybersecurity2DModerate60 FPS📱 Mobile-adapted⇄ 3D version

Details

CategoryCybersecurity

RenderingCanvas 2D

DifficultyModerate

Target FPS60

ControlsAdjust the transaction amount slider, tap the 'Tap to Pay' button to generate a new dynamic cryptogram, launch a 'Replay Last Cryptogram' attack to see the monotonic-counter defense in action, reset the session to re-provision a fresh device key, and drag/scroll the diagram to pan and zoom the phone-to-terminal exchange.

NFCtokenizationEMVcybersecuritymobile paymentscryptography

Related simulations

Network Packet RoutingRouters run real Dijkstra shortest-path routing to find a route to a destination; edit link…

DDoS Attack VisualizerA botnet of distributed sources floods a target server past its request-handling capacity —…

Password Strength AnalyzerType a candidate password (never sent anywhere) and watch a brute-force attacker and a… ⊞ All 551 in Cybersecurity →

A mobile wallet never puts your card number on the air. This 2D diagram renders the phone-to-terminal NFC exchange and drives it with the real mechanic that protects a tap: a device-bound key and a strictly-increasing transaction counter (ATC) that together produce a fresh, single-use cryptogram on every tap. Trigger a payment to watch the counter advance and a new cryptogram travel across the NFC field, then launch a replay attack that resends a previously captured cryptogram unmodified — and watch the terminal reject it every time because its ATC has already been spent, exactly as EMV contactless / Apple Pay / Google Pay behave in the real world. Drag to pan the diagram and scroll to zoom in on the packet exchange.

⚙ Under the hood

Interactive 2D diagram of the dynamic cryptogram protocol behind mobile wallet tap-to-pay: a device-bound key and a monotonic transaction counter generate a single-use cryptogram per tap, and a replay attack on a captured cryptogram is cryptographically rejected in real time. Drag to pan and scroll to zoom the phone-to-terminal exchange.

NFCtokenizationEMVcybersecuritymobile paymentscryptography

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install