sysop@hub:~/explainers$
explainers
Diagrams you click through one step at a time, and labs where you make the decisions.
diagrams 7
How an attack or a protocol works, one step per click, with the defences that matter.
snapshot-is-not-a-backupEight things that go wrong, and whether a snapshot, RAID, a replica or a backup survives them.1 tableaitm-phishingA phishing proxy relays the real sign-in, MFA included, and keeps the session cookie.1 diagramdevice-code-phishingTokens stolen on the real Microsoft page. No fake site, and MFA passes.1 diagramkerberosHow Kerberos issues tickets, and how Kerberoasting turns that against a service account.2 diagramsoauth-flowThe authorization code flow with PKCE and OpenID Connect, as Entra ID does it.1 diagramconditional-accessHow Entra ID decides on every sign-in: signals, policies, grant or block.1 diagrampki-chainWhat a browser checks in a certificate: leaf, intermediate, root store, revocation.1 diagram
hardware 8
Tips and tricks with a screwdriver in your hand, with drawings.
cablesCopper categories, fibre colours, DAC and AOC, RJ45 wiring, and a voltage drop calculator.1 drawingtoolkitWhat belongs in the bag: bits, opening tools, a multimeter, testers, sticks and spares.3 drawingsprinterWhere paper jams, what each print defect means, toner, drum and fuser, inkjets, label printers.4 drawingsbuyingWhat to buy for whom, which warranty, how long to keep it, and what to do at the end.2 tablesnetworkPort lights, the path from wall socket to switch, wiring a plug, fibre, where access points belong.5 drawingsdesktop-pcMemory slots, the front panel header, thermal paste, airflow, power supplies and the classic build mistakes.5 drawingsnotebookOpening one safely, the power drain trick, chargers, batteries, ribbon cables, display faults, spills.4 drawingsserverRemote management, reading the lights, replacing a disk, memory, power, rack units, firmware.5 drawings
concepts 1
How something works and what it is for, in plain words.
labs 5
Try it yourself: a tabletop exercise, a simulator, a self-assessment and a phishing game.
incident-simA tabletop exercise for one: payment fraud, ransomware at 3 a.m. or a leaver with the customer list.3 scenariosconditional-access-simulatorChoose user, device, location and risk, switch policies on and off, see the result.labsecurity-self-check21 questions on Microsoft 365 security, a score and the gaps to close first.labphish-or-legitTen messages, one decision each. The red flags are explained after every answer.labwar-storiesIncidents as timelines, with what the investigation found and what would have stopped it.3 stories
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