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Field notes on privacy, security and the devices you carry.

You are not safe behind a NAT
Network Security

You are not safe behind a NAT

NAT blocks incoming traffic. Or does it? Check your router today.

Latest
Does Your Linux Firewall Cover IPv6?
October 7, 2026 · Network Security

Does Your Linux Firewall Cover IPv6?

BGP Hijacking: Trust Like It's 1989
October 6, 2026 · Network Security

BGP Hijacking: Trust Like It's 1989

BGP Hijacking Case Study: KLAYswap
October 5, 2026 · Network Security

BGP Hijacking Case Study: KLAYswap

How GPS Spoofing Affects NTP
October 3, 2026 · Network Security

How GPS Spoofing Affects NTP

Wi-Fi Networks Can Break Your VPN
Network Security

Wi-Fi Networks Can Break Your VPN

October 3, 2026
Read post →
Computers can Time Travel: Introduction to NTP Attacks
Network Security

Computers can Time Travel: Introduction to NTP Attacks

October 2, 2026
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Certificate Transparency Logs: CA-signed Certs are Public
Web Security

Certificate Transparency Logs: CA-signed Certs are Public

October 1, 2026
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Five Common TLS Misconfigurations
Web Security

Five Common TLS Misconfigurations

September 30, 2026
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SNI Case Study: 730 Misconfigured Domains
Web Security

SNI Case Study: 730 Misconfigured Domains

September 29, 2026
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Do Certificate Authorities Use CAA?
Network Security

Do Certificate Authorities Use CAA?

September 28, 2026
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The State of DNSSEC - Korea
Network Security

The State of DNSSEC - Korea

September 26, 2026
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What's the most secure email provider? We tested
Email Security

What's the most secure email provider? We tested

September 23, 2026
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MTA-STS Policies in Practice
Email Security

MTA-STS Policies in Practice

September 22, 2026
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Email Security Explained: One Message, Six Checks
Email Security

Email Security Explained: One Message, Six Checks

September 21, 2026
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Why DKIM Never Required Key Rotation
Email Security

Why DKIM Never Required Key Rotation

September 16, 2026
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A 2008 Debian Bug Still Signs Corporate Email
Email Security

A 2008 Debian Bug Still Signs Corporate Email

September 15, 2026
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RFC 9989 DMARC Support Study
Email Security

RFC 9989 DMARC Support Study

September 14, 2026
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Your DMARC Rollout Guide Still Teaches a Removed Tag
Email Security

Your DMARC Rollout Guide Still Teaches a Removed Tag

September 12, 2026
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RFC 9989 - an email standard in 2026?
Email Security

RFC 9989 - an email standard in 2026?

September 4, 2026
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The State of SPF - Korea
Email Security

The State of SPF - Korea

September 3, 2026
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Email spoofing: we tested 10,000+ Korean domains
Email Security

Email spoofing: we tested 10,000+ Korean domains

September 1, 2026
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Opening an email can be dangerous
Email Security

Opening an email can be dangerous

August 31, 2026
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robots.txt compliance is optional
Network Security

robots.txt compliance is optional

August 28, 2026
Read post →
Korea's ISMS-P Doesn't Wait for a Letter
Regulatory Compliance

Korea's ISMS-P Doesn't Wait for a Letter

August 25, 2026
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