Articles in Security category

Secure AI agent tools against prompt injection, poisoned metadata, unsafe results, and supply-chain changes. Apply least privilege, runtime policy, approvals, and audit controls.

A rigorous treatment of Base64 from first principles: the mathematical basis for the 64-character alphabet (2⁶ = largest power-of-two mapping to printable ASCII), RFC 4648 canonical specification, the BaseN encoding family (Base16 through Base85 with size/alphabet trade-offs), streaming encoder and decoder state machines, MIME line-wrapping rules, PEM format anatomy, constant-time decoding for cryptographic contexts, SIMD-accelerated lookup tables, and production boundary advice for JWTs, data URLs, and HTTP Basic Auth.

Understand Bearer Tokens without confusing the transport scheme with JWT or OAuth. This guide covers issuer, audience, scope and tenant validation, TLS, browser storage and CSRF, refresh-token rotation, revocation, algorithm policy, and framework boundaries.

Understand what cryptographic hashes can and cannot prove. Compare MD5, SHA-1, SHA-2, and SHA-3 for integrity, distinguish fast hashes from Argon2id/bcrypt password KDFs, and learn the limits of checksums, digital signatures, deduplication, and blockchain examples.

Understand JWT structure without confusing encoding, signing, encryption, or authorization. This guide covers algorithm allowlists, issuer/audience/expiry validation, browser storage and CSRF, refresh-token rotation, revocation, JWS/JWE, and safe JavaScript, Python, and Java boundaries.

A security-focused guide to JWT signing keys. Learn the boundary between JWT, JWS, HMAC, and encryption; generate HS256/HS384/HS512 secrets with a local CSPRNG; choose RSA, EC, or EdDSA keys; verify claims and algorithms; and design storage, rotation, revocation, and incident response without treating JWT as authorization.

Understand what MD5 computes, why its collision resistance is broken, and which security boundary each alternative covers. This guide distinguishes accidental checksums, cryptographic hashes, password KDFs, HMACs, digital signatures, length-extension risk, and secure migration patterns with reproducible examples.

Learn how password entropy, CSPRNG sampling, length, passphrases, password managers, MFA, and breach response interact. This guide separates theoretical search space from real crackability and gives browser, Python, and Java implementation boundaries without promising universal security.

A defensive guide to the OWASP Top 10 for Agentic Applications 2026. It maps the official risk themes to identity, tool authorization, memory, inter-agent communication, code execution, observability, testing, and incident-response controls without treating a checklist as a security boundary.

A practical privacy engineering guide for global AI products. Covers GDPR, CCPA/CPRA, data minimization, consent, retention, deletion, training data isolation, prompt logging, redaction, DSAR workflows, and privacy-safe analytics.

A practical EU AI Act technical compliance guide for high-risk AI systems. Covers risk management, data governance, logging, transparency, human oversight, accuracy, robustness, cybersecurity, documentation, and engineering implementation patterns.

A source-aware guide to licensing open-weight AI models in 2026. It separates copyright, weights, code, outputs, data, contracts, and regulatory duties, then gives teams a version-pinned checklist for commercial use, modification, redistribution, training, deployment region, and EU AI Act review.

Design an enterprise OAuth boundary for a remote MCP server without confusing authentication with authorization. This guide covers protected-resource metadata, discovery, PKCE, JWT validation, JWKS rotation, delegated downstream access, tenant isolation, browser boundaries, and production testing.

A deep dive into LLM Guardrails principles and engineering. Covers NeMo Guardrails, Guardrails AI, and Llama Guard. Includes Python/Node.js examples for building safe, reliable, and hallucination-free AI applications.

Design AI Agent memory around purpose limitation, data minimization, provenance, retention, access control, deletion propagation, and evidence. Explains why vector deletion, summaries, caches, backups, fine-tuning, and model outputs need separate treatment under GDPR-style privacy programs.

Explore the escalating battle between AI web crawlers and content publishers. From traditional robots.txt to Cloudflare's AI Labyrinth and legal challenges, learn how the web is defending itself against unauthorized AI training data collection.

Learn how bcrypt password hashing works, calibrate its cost factor on production hardware, read the 60-character hash structure, and compare bcrypt with Argon2id and scrypt using Node.js, Python, Java, and Go.

Build prompt-injection-resistant LLM applications with explicit trust boundaries, least privilege, deterministic tool authorization, provenance-aware data flow, egress controls, bound user confirmations, sandboxing, and adaptive security evaluations. Covers direct, indirect, RAG, memory, multimodal, MCP, and persistent attacks.

A careful guide to IP and DNS diagnostics. Learn IPv4/IPv6 address scope, recursive and authoritative resolution, record semantics, TTL and DNSSEC limits, GeoIP uncertainty, safe command-line checks, privacy boundaries, and why a lookup is not proof of ownership, location, or compromise.

A deep technical guide to regular expressions covering NFA backtracking engines vs linear-time RE2/DFA engines, ReDoS vulnerability patterns and real CVEs, catastrophic backtracking diagnosis, cross-engine portability between PCRE, JavaScript, Python, Go RE2, Java, and .NET, Unicode property escapes and grapheme clusters, and when regex is fundamentally the wrong tool for the grammar class of the input.

A standards-grounded guide to URL percent-encoding covering RFC 3986 URI component grammar, reserved vs unreserved character sets, the UTF-8 encoding pipeline for non-ASCII, the critical difference between application/x-www-form-urlencoded and RFC 3986, double-encoding vulnerabilities, URL normalization for comparison, and cross-language API behavior in JavaScript, Python, Go, and Java.

Master URL encoding and decoding techniques. Learn special character handling, API data integrity, encodeURIComponent best practices. Includes JavaScript/Python/Java code examples!