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.
Keep an offline root, sign a name constrained intermediate, issue short lived certificates over ACME on your LAN, then install the root on every device.
Run Home Assistant OS on a device or VM, keep devices local, turn on MFA and encrypted backups, and reach it remotely through a VPN, not an open port.
SPI flash write protection locks firmware with chip bits, a WP# pin, chipset locks and a root of trust. Learn how each layer works and how to check yours.
OpenSBI is the reference M-mode firmware that gives RISC-V kernels timers, IPIs and hart control via the SBI. Learn the boot chain and how to verify it.
Linux Mint runs from 1.0 Ada (2006) to 22.3 Zena (2026), with 27 Adrien next. Here is every Ubuntu base, LMDE release and support end date for each.
NetBSD 11.0 (30 July 2026) is its 19th major release. Every version date, the two branch support rule, pkgsrc quarterly branches and how to patch.
IS-IS is a link-state IGP that runs over layer 2. How NETs, LSPs, levels and TLVs work, how HMAC authentication protects it, and a FRRouting lab.
mDNS resolves .local names by multicast on UDP 5353 and DNS-SD finds services with PTR, SRV and TXT records. How both work and how to secure them.
GRE and IP-in-IP wrap one IP packet inside another with no encryption. How the headers work, why MTU breaks, and how to lock tunnels down with IPsec.
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