Security Fundamentals

A clear explainer on HTTPS: what it is and how it differs from HTTP, how TLS encrypts data in transit, the role of certificates and certificate authorities, what the padlock does and does not prove, HSTS and the move to HTTPS-everywhere, mixed content, and why HTTPS matters for both privacy and integrity.

A defensive explainer on exploits: what an exploit is, how it differs from a vulnerability and a payload, what zero-days, proof-of-concept code and exploit kits are, the difference between a weaponized exploit and one in the wild, and how patching, mitigation and layered defense reduce the risk that a vulnerability turns into a compromise.

A clear, defensive explainer of the different types of computer viruses: file infectors, macro viruses, boot-sector viruses, polymorphic and metamorphic viruses, multipartite and resident viruses, how a virus differs from worms and trojans, where viruses sit within the broader category of malware, and the modern defenses that actually matter.

A defensive explainer on intrusion detection systems: what an IDS is and what it does, the difference between an IDS and an IPS, network-based (NIDS) versus host-based (HIDS) placement, signature-based versus anomaly-based detection, where an IDS sits in a network, how it feeds a SIEM, and its limits including false positives.

A defensive explainer on corporate espionage: what it is and how it differs from state espionage, the insider threat, the theft of trade secrets and intellectual property, the methods attackers use from phishing to recruited insiders to supply-chain access, a plain-language legal note, and the controls that defend against it such as classification, least privilege, DLP, monitoring and NDAs.

A defensive explainer on attack vectors: what an attack vector is and how it differs from the attack surface, the most common vectors including phishing, stolen credentials, unpatched vulnerabilities, misconfigurations, supply-chain compromise, insiders and physical access, and how layered controls and reducing the attack surface defend against them.

SMB uses TCP port 445 directly; port 139 is legacy SMB over NetBIOS. Why both are high-risk (EternalBlue, WannaCry), why to block them, and how to secure SMB.

A clear explainer on UPnP (Universal Plug and Play): what it does, how automatic port forwarding works, why exposed UPnP is a serious router security risk, the difference between internal and WAN-facing UPnP, and when and how to disable it safely.

A plain-English explainer on parked domains: what domain parking means, the difference between legitimate and malicious parking, how parked domains enable typosquatting and phishing, and the DNS, monitoring and brand-protection defenses that reduce the risk.

A clear explainer on hidden and anonymous proxy servers: what they are, how attackers and insiders use them to evade security controls, the data-exfiltration and command-and-control risks they create, and the egress filtering and detection techniques that surface them.

A clear explainer on the categories of denial-of-service attacks: volumetric, protocol and application-layer, plus amplification and reflection techniques and the botnets behind DDoS, and the layered mitigations — rate limiting, upstream scrubbing, CDN and WAF — that absorb them.

A plain-English explainer on the legality of DDoS attacks: why launching one is a crime in most jurisdictions, how laws like the US Computer Fraud and Abuse Act and the UK Computer Misuse Act apply, why booter and stresser services are illegal to use, and the general nature of the penalties — with the clear caveat that this is general information, not legal advice.

A plain-English explainer on Application Security Posture Management (ASPM): what it is, why it emerged from application-security tool sprawl, how it correlates and deduplicates findings from SAST, DAST, SCA and secret scanners, how ASPM differs from CNAPP, and what a good ASPM program actually delivers.

A clear explainer on the Cloud-Native Application Protection Platform (CNAPP): what it consolidates (CSPM, CWPP, CIEM and DSPM), why Gartner coined the term, what it covers from code to cloud runtime, how CNAPP differs from standalone CSPM, and what to look for in a platform.

A practical explainer on Dynamic Application Security Testing (DAST): what black-box runtime scanning is, how DAST differs from SAST, IAST and SCA, its strengths and limits, where it fits in CI/CD, and how to get useful results without drowning in false positives.

A practical explainer on the NIST Secure Software Development Framework (SSDF, SP 800-218): its four practice groups (PO, PS, PW, RV), why it exists after Executive Order 14028 and the software supply-chain crisis, how it maps onto any SDLC, and how it connects to federal secure-development attestation.

A defensive, educational explainer on DLL injection: what a dynamic link library is, why attackers abuse DLL injection for evasion and persistence, the conceptual mechanisms (without weaponizable code), and how to detect and defend against it with EDR, image-load monitoring, signing and hardening.

A practical explainer on the CSA Consensus Assessments Initiative Questionnaire (CAIQ): what it is, how it relates to the Cloud Controls Matrix (CCM) and the STAR registry, how it is used in cloud vendor assessment and third-party risk, and how CAIQ compares to the SIG questionnaire.

A clear, defensive explainer of non-repudiation: what it means, how it extends the CIA triad, the mechanisms that provide it (digital signatures, PKI, audit logs and trusted timestamping), real-world examples, and why non-repudiation is about producing evidence that stands up later rather than keeping data secret.

A clear, defensive explainer of mitigation versus remediation: precise definitions, how mitigation reduces impact or likelihood while remediation fixes the root cause, where risk acceptance and transfer fit, how both play out in vulnerability management, and worked examples so teams use the terms consistently.

A clear explainer of an ISMS: what an Information Security Management System is, how ISO/IEC 27001 defines it, the Plan-Do-Check-Act cycle that keeps it running, the core artefacts (scope, risk assessment, risk treatment and the Statement of Applicability), and the benefits of managing security as a system rather than a pile of controls.

A clear, defensive explainer of hardware tokens: what they are, the difference between OTP tokens, FIDO2/U2F security keys and smart cards, why security keys are phishing-resistant and OTP tokens are not, and the pros and cons of hardware tokens versus authenticator apps.

A calm, practical guide to a leaked password: how passwords actually leak (breaches, credential stuffing, infostealers and reused passwords), how to check whether yours is exposed, the immediate steps to take, and why unique passwords, a password manager, MFA and passkeys are the durable fix — plus what organisations should do to monitor breached credentials.

A clear explainer of a business continuity plan: what a BCP is and how it differs from disaster recovery, the business impact analysis that drives it, RTO and RPO, the core components of a plan, why testing is what makes it real, and how to approach building one.

A plain-English explainer on why cybersecurity matters: the financial, operational, reputational, regulatory and personal stakes, why the risk is higher now because of cloud, remote work, AI and supply chains, and what good basic security actually looks like for organisations and for people.

A plain-English explainer on mobile device forensics: what it is, when it is used in incident response and legal matters, the acquisition types (logical, file-system and physical), chain of custody, the challenges posed by encryption and cloud data, and the category of tools involved — written defensively, without vendor claims.

A plain-English explainer on man-in-the-middle attacks: what they are, how they work (ARP spoofing, rogue Wi-Fi, DNS spoofing, SSL stripping, adversary-in-the-middle phishing kits), the main attack classes, and the defenses that actually stop them — TLS and HSTS, certificate validation, VPNs on untrusted networks, phishing-resistant MFA, mutual TLS and DNSSEC.

A clear explainer on defense in depth: what it means, where the idea comes from, the layers of control (perimeter, network, endpoint, application, data, identity, physical and people), why no single control is ever enough, how it maps to zero trust and the NIST Cybersecurity Framework, and a worked example of layers catching what others miss.

A practical explainer on data leakage: what it is and how it differs from a data breach, the common causes (misconfigured cloud storage, shadow IT, email misdelivery, insiders, logs and telemetry, and AI prompt leakage), the controls that prevent it (classification, encryption, egress and DLP tooling, access control and redaction), and the new AI-era angle of sensitive data leaking into prompts and models.

A clear, defensive explainer of cryptography for security teams: what it is, symmetric encryption (AES) versus asymmetric encryption (RSA and ECC), hashing (SHA-256) and why it is not encryption, digital signatures, how key exchange works in a TLS handshake at a high level, why key management is the hard part, and a high-level note on post-quantum cryptography and NIST's standardized algorithms.