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Key Points

Key Takeaways

  • 1

    See the Invisible

  • 2

    Flipper Zero: 'Tamagotchi' for hackers. Reading NFC tags, copying infrared remotes, opening/closing garage doors (Sub-GHz). Can hack world with this one unit

  • 3

    HackRF One: Full-fledged SDR (Software Defined Radio). Can receive and transmit all radio waves from 1MHz to 6GHz. Used for signal analysis of car keys etc

  • 4

    Security Hygiene: Is my card skimmable? Can home key withstand replay attack? By holding tool, defense measures become visible

  • 5

    Warning: These are tools for 'Penetration Test (Intrusion Experiment)'. Using them against other people's assets without permission is crime

Introduction: Wand of Wizard

Arthur C. Clarke said. “Any sufficiently advanced technology is indistinguishable from magic.” Pass through ticket gate by holding smartphone. Open car by pressing remote control. These are modern “Magic”.

However, we engineers know that it is not magic but “Wireless Protocol”. Flipper Zero is device to reveal seed of that magic.

1. The Multi-Tool: Flipper Zero

This device with cute dolphin character is in pockets of geeks around world.

  • Sub-GHz : Frequency band used for car keys and garage remotes.
  • RFID/NFC : Reading/emulation of employee ID and IC card.
  • Infrared : Learning infrared remote of air conditioner and TV.
  • GPIO : Pin header for electronic work.
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Flipper Zero (Protective Case)

*Recommended to purchase main unit from official site. This is silicone case, but by attaching this, Flipper becomes complete 'Cyberpunk Gadget'. If Wi-Fi board is added, vulnerability diagnosis of network is also possible.

Amazon

2. The Heavy Weapon: HackRF One

If you want to dive into deeper “Wave” world, need SDR (Software Defined Radio).

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Great Scott Gadgets HackRF One

From 1MHz to 6GHz. Covers almost all commercial radio frequencies. By connecting to PC and visualizing waveform (Spectrum Analyzer), can analyze what kind of data is flying.

Amazon

Replay Attack

“If record radio wave of car key and play it later, won’t it open?” Many people think so. If use HackRF, can experiment how it is prevented by “Rolling Code”, or whether it is not prevented (vulnerable system).

3. Comparison: Play or Research

項目 Flipper Zero HackRF One
Portability Pocket size PC required
Usage Preset attack / Convenient tool Signal analysis / Research
Frequency Range Specific band only 1MHz - 6GHz
User Experience Game feeling Academic

Conclusion: Knowing Attack to Know Defense

Security engineers need to think like thieves. If do not know “Where can enter?”, do not know where to lock.

Radio waves are invisible. However, if use tool, beautiful waveform and structure become visible. Please realize that world is filled with 0 and 1 signals.

# security # flipper-zero # hackrf # sdr # radio # 2026