She held the reader to her apartment door fob. A string of hex appeared. Then a name she didn’t recognize: GRAYSON, J. Access level 2. Last used: 12 minutes ago.

The software finally downloaded. A .exe with no icon, flagged by Windows Defender twice. She ran it in a VM anyway.

She used Grayson’s card to enter his apartment. On the kitchen table: a printed blueprint of the city’s emergency backup data center. And next to it, the exact same RFID reader she owned. Same model. Same scratch on the casing.

EM4100 Sniffer – Ready.

Mara hadn’t slept in thirty hours. Spread across her desk were three cloned EM4100 cards, a soldering iron still warm, and a cheap RFID reader she’d bought off a surplus site for twelve dollars.

The search tab was still open on her laptop: "em4100 rfid reader software download" — third result down, a gray forum post from 2017. No replies. Just a dead MediaFire link and a single comment: “works if you tweak the baud rate.”

She wasn't a hacker. She was a locksmith’s daughter who’d learned that all security was just performance art. The building she needed to get into wasn't high-tech. It was worse: it was lazy . They used EM4100 fobs—thirty years old, no encryption, broadcast their ID like a town crier. All you needed was the right ears.