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Ccircuitrockscircuitrocks.hashnode.devAug 31 · 3 min read

ATtiny816 PCB Business Card Runs 21 LEDs on Harvested NFC Power

Battery-free is not the same thing as unpowered. A card you can tap against a phone and watch light up, with no cell to die and no port to charge, runs on energy the phone's own NFC field is already r

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LTLưu Tuấn Anhblog.fiscybersec.comAug 20 · 12 min read

WindRelay: New Malware Duo Behind the Wave of Fraud

Overview Did you know that it only takes 13 short minutes from the moment the victim picks up the phone to receive the support call from the "bank employee" until all the money in the account is evapo

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SISHINGO IGUCHIuwb.hashnode.devJul 28 · 10 min read

UWB vs NFC vs BLE vs RFID — A Comparison for Vehicle Access

The last three posts in this series went deep on UWB — the physical layer, the channel environment, the angle of arrival math. That depth is useful, but it can also obscure a more basic question: why

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VVaultKeepRblog.vaultkeepr.xyzMay 7 · 7 min read

NFC Encrypted Backup — Your Master Key on a Physical Tag

NFC Encrypted Backup — Your Master Key on a Physical Tag What if you could store your encrypted master key onto a tiny physical tag — and recover your vault on a new device with a single tap? That's e

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VVaultKeepRblog.vaultkeepr.xyzMay 7 · 8 min read

Sauvegarde NFC Chiffrée — Votre Clé Maîtresse sur un Tag Physique

Sauvegarde NFC Chiffrée — Votre Clé Maîtresse sur un Tag Physique Et si vous pouviez stocker votre clé maîtresse chiffrée sur un petit tag physique — et récupérer votre coffre sur un nouvel appareil d

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TRTom Rowbothamblog.xeno.moneyJan 27 · 6 min read

What Does "New Card Scheme" Actually Mean? Building Payment Rail 3.0

TL;DR: A card scheme is the network that connects consumers, merchants, and banks. Visa and Mastercard have dominated for 50 years. Blockchain enables a third option - one with instant settlement, zero chargebacks, and peer-to-peer finality. Underst...

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JWJohn Walleythatorjohn.hashnode.devJan 7 · 1 min read

Eating My Own Dog Food

No idea if my previous entry about Tchecke is going to stay undeleted on hashnode (I’ve tried to restore it multiple times unsuccessfully). Short story is I built an event check-in site a couple months ago. I’ve had a chance to use it a couple of tim...

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Uudythincudythinc.hashnode.devOct 28, 2025 · 4 min read

The rise of multi-protocol card readers is driving the upgrade of intelligent access control and Internet of Things applications

With the rapid development of the Internet of Things, smart cities and digital identity technologies, traditional single-frequency band card readers can no longer meet the diverse application requirements. In recent years, multi-protocol card readers...

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EVEnrico Violanaus3a.hashnode.devAug 19, 2025 · 3 min read

Pass extension for OpenKeyChain

https://www.threads.com/@naus3a/post/DNi1dmGtvC5?xmt=AQF0IrfUcDXmDao6YN_evnURZPrx2E6jLdr7wDcwix7XJg It looks like these days I’m spending my free time mostly fiddling with passwords… I swear I have other interests. Really. Motivation Anyhow: I use ...

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EVEnrico Violanaus3a.hashnode.devAug 17, 2025 · 3 min read

My new cyberpunk stateless password manager implant

https://www.threads.com/@naus3a/post/DNdcHa2tIqS Premise: I’m into cyberpunk and and I’m into cryptography. Being into cyberpunk eventually led me to hang out with grinders, which in turn ended up with me installing electronics under my skin. Being...

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#nfc

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#nfc

Explore Hashnode

Trending tags this week

ATtiny816 PCB Business Card Runs 21 LEDs on Harvested NFC Power

WindRelay: New Malware Duo Behind the Wave of Fraud

UWB vs NFC vs BLE vs RFID — A Comparison for Vehicle Access

NFC Encrypted Backup — Your Master Key on a Physical Tag

Sauvegarde NFC Chiffrée — Votre Clé Maîtresse sur un Tag Physique

What Does "New Card Scheme" Actually Mean? Building Payment Rail 3.0

Eating My Own Dog Food

The rise of multi-protocol card readers is driving the upgrade of intelligent access control and Internet of Things applications

Pass extension for OpenKeyChain

My new cyberpunk stateless password manager implant