01 The "Bat Signal" for Researchers
Security researchers scan the web daily. If they find a vulnerability in your site, they often struggle to find the right person to contact. Customer support usually ignores them. security.txt solves this by providing a clear, technical contact channel.
02 The "Suggestion Box" Analogy
Imagine your website is a building. You lock the doors, but a window is left open:
The Researcher
A passerby who notices the open window.
The Problem
If they tell the receptionist (Support), the message gets lost.
The Solution
A dedicated "Security Hotline" sign (security.txt) that goes straight to the Security Team.
03 Anatomy of the File
It's a simple text file with specific fields:
PGP Key
Encryption: https://example.com/pgp-key.txt
Allows reports to be sent securely.
Rules
Policy: https://example.com/disclosure
What researchers are allowed (and not allowed) to test.
04 Avoiding "Full Disclosure"
If a researcher can't contact you, they might publish the vulnerability publicly on Twitter to get your attention. This is called "Full Disclosure" and it gives hackers a blueprint to attack you before you can fix it.
05 Deployment in 3 Steps
It takes less than 5 minutes to set up:
1. Create the File
Create a plain text file named security.txt. Add your contact email.
2. Upload to Server
Place it in the /.well-known/ folder of your website. This is the standard location defined by RFC 9116.
3. Validate
Use an automated scanner to ensure it's readable and correctly formatted.
06 Frequently Asked Questions
Is security.txt mandatory?
It is now mandatory for government agencies in the US, UK, and Netherlands. While not law for private companies yet, it is considered a cybersecurity best practice.
Will this expose me to more hackers?
No. Security researchers will find bugs whether you have this file or not. Security.txt just ensures they tell YOU about it instead of selling it on the dark web.
Where should I put the file?
The official standard (RFC 9116) states it must be placed in the `/.well-known/` directory (e.g., `yoursite.com/.well-known/security.txt`).
What is a PGP key?
A PGP key allows researchers to encrypt their email to you. This is crucial because vulnerability reports often contain sensitive details how to hack your site.