NIST 2025 password recommendations: what's changed
The NIST has rewritten its password rules. No more mandatory rotation, no more complexity requirements. A complete breakdown of SP 800-63B-4 with a step-by-step compliance plan.
Articles - Page 5
February 2026
Passphrase vs password: which one is actually safer?
A 16-character random password or a 5-word dice-generated phrase? A technical comparison with entropy calculations, use cases, and practical recommendations.
IPv6 subnets: understanding /48, /56, and /64
Which IPv6 prefix should you use for your network? Detailed comparison of /48, /56, and /64 sizes with a table, decision tree, and real-world examples.
Passkeys vs passwords: should you ditch your passwords in 2025?
Google, Apple, and Microsoft are pushing passkeys as the replacement for passwords. But are they ready for widespread use? Technical comparison, benefits, limitations, and transition strategy.
Port 25 blocked: diagnosis and solutions by hosting provider
Port 25 is blocked by most cloud providers and ISPs to fight outbound spam. Here's how to diagnose the block and restore your sending capability.
STARTTLS, SSL/TLS and SMTP: which encryption for your emails?
SSL, TLS, STARTTLS, Implicit TLS, DANE, MTA-STS: email encryption in transit relies on mechanisms that are often confused. This guide clarifies each protocol, explains their vulnerabilities, and shows how to configure robust TLS encryption on Postfix, Exim and Exchange.
SMTP ports explained: 25, 465, 587, 2525, which one should you use?
Port 25, 465, 587, or 2525? Each SMTP port has a specific role. This guide breaks down how each port works, its encryption method, the relevant RFCs, and helps you pick the right port for your use case.