Deep dives, practical guides, and incident analyses from engineers who build Safeguard. No fluff, no vendor FUD — just what you need to ship secure software.
Ubuntu interim releases get 9 months, LTS gets 5 years standard, 10 with Ubuntu Pro ESM and 15 with Legacy. How HWE kernels, flavours and upgrades fit in.
IPsec protects IP packets with ESP; IKEv2 (RFC 7296) negotiates the keys. How the exchanges work, which algorithms RFC 8221 and 8247 keep, how to check.
Kali shipped 26 quarterly releases from 2020.1 to 2026.2, kernel 5.4 to 6.19. Dates, kernels, Xfce versions and the security changes that matter.
IEEE 802.1X keeps a wired or Wi-Fi port closed until EAP proves who is connecting, checked by a RADIUS server. How EAPOL, EAP methods and keys work.
WebSocket (RFC 6455) turns one HTTP request into a two-way framed channel. How the handshake, frames, masking and close codes work, and how to secure it.
IMAP keeps mail and folders on the server and syncs every device; POP3 downloads mail to one client. Secure both with TLS on 993 and 995 and OAuth tokens.
Most UDP services should never face the internet. How to list UDP ports on Linux, Windows and macOS, test them from outside and lock down DNS, NTP, SNMP.
OAuth 2.1 folds PKCE, exact redirect matching and the RFC 9700 security rules into one spec and drops implicit and password grants. How to migrate.
QUIC (RFC 9000) is an encrypted transport over UDP; HTTP/3 (RFC 9114) runs HTTP on it. How they work, where they are weak and how to secure them.
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