Offensive tradecraft, deep-dive vulnerability research, threat actor analysis, and modern cybersecurity methodology.
Password entropy measures how hard a secret is to guess, in bits. Here is the formula, why Password1! fails it, and how to generate something strong.
A hash is a fixed-length fingerprint of data. Here is how MD5 and SHA-256 differ, why fast hashes are wrong for passwords, and what HMAC adds.
A JWT is a signed bundle of JSON claims. Here is how to read one, why decoding is not verifying, and how to check for the classic JWT security flaws.
A cron expression is five fields that say when a job runs. Here is how to read them, avoid the OR, step and DST traps, and audit crontabs safely.
An IPv4 address is one 32-bit number. Here is how to read it as decimal, hex, binary or integer, size a CIDR block, and spot private ranges.
A TLS certificate binds a domain name to a public key. Here is how I read one, trace its chain, fix common errors, and check CSRs and CAA records.
This checklist shows how to vet an MCP server before an agent touches it, from provenance and reading a published grade honestly to auth, version pinning and cr…
A CVSS vector is the reasoning behind the score. This guide reads 3.1 and 4.0 strings, shows where they differ, and explains why the base number is not patch pr…
A PTR record maps a public IP back to a hostname. That name is untrusted until a forward lookup returns the same address.
Magic bytes name a format from leading or offset bytes, not the filename: PNG, PDF, ZIP, ELF and MZ, why a shared PK match is incomplete, and how to check an up…
What SPF, DKIM, and DMARC do, why aligned SPF or DKIM is enough for DMARC, and how to grade your domain with a live checker.
Need to read a domain's registration record? Here is what WHOIS and RDAP mean in 2026, which fields matter for hygiene and IR triage, why registrant data is oft…
