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password-protect

Apply or update password protection on NTAG21x and MIFARE Classic NFC tags.

Updated Apr 30, 2026
Search Tags:#security#hardware#password#nfc#ntag21x#mifare#tag-protection
One-click install
npx skills add https://github.com/danielrosehill/Claude-NFC-Ops-Plugin --skill password-protect
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: password-protect
Source: https://github.com/danielrosehill/Claude-NFC-Ops-Plugin/tree/main/skills/password-protect
Command: npx skills add https://github.com/danielrosehill/Claude-NFC-Ops-Plugin --skill password-protect

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps secure NFC tags by applying or updating password protection on NTAG21x and MIFARE Classic tags, preventing unauthorized reads or writes.

Core Features & Use Cases

  • Configure PWD/PACK on NTAG21x tags to enforce authentication for reads and writes.
  • Update MIFARE Classic sector trailers with new keys (A or B) and verify changes.
  • Include user prompts and safety warnings because password protection is irreversible if password is lost.

Quick Start

Present a tag, enter the new password when prompted, and confirm the protection flow to complete.

Frequently Asked Questions about password-protect

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I password protect NFC tags to prevent unauthorized reads?▼

To password protect NFC tags, you can apply authentication on NTAG21x and MIFARE Classic tags by configuring PWD/PACK or updating sector trailers, enforcing read and write protection.

Can I update the password on a MIFARE Classic sector trailer without losing data?▼

Updating a MIFARE Classic sector trailer with new keys A or B does not inherently erase user data, but incorrect key changes can cause irreversible lockouts from the affected sectors.

How does NTAG21x password protection work?▼

NTAG21x password protection works by setting PWD and PACK values on the tag, which then requires authentication before allowing any read or write operations to the protected memory areas.

What happens if I lose the password applied to an NFC tag?▼

Losing the password applied to an NFC tag results in an irreversible lockout, as the protection flow is designed to be permanent and cannot be bypassed without the correct credentials.

Does this NFC tag protection process support both NTAG21x and MIFARE Classic?▼

Yes, the NFC tag protection process supports both NTAG21x and MIFARE Classic families, handling the full flow of prompting, generating, applying, and verifying protection across both.

Are plaintext passwords logged when securing NFC tags?▼

No, plaintext passwords are never logged when securing NFC tags; the process logs protection actions and results while carefully avoiding the exposure of sensitive password data.

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