E-Book Library
AI & Cybersecurity Guides
Everything I've learned about GEO, AI agents, zero trust, identity management, and cybersecurity strategy, distilled into practical chapter-by-chapter guides you can read online for free.
Author
Deepak Gupta
15+ years building at the intersection of AI and cybersecurity. Founder of GrackerAI. I write about what I build.
Latest E-Book
AI-Powered Cyber Threats: The Enterprise Defense Guide
How AI changed vulnerability discovery, exploitation and identity risk in 2026, and the defense framework security leaders need now
A data-backed guide for CISOs, security architects and AppSec leaders on AI-driven threats: Claude Mythos and Project Glasswing, agentic vulnerability discovery and chaining, the patch bottleneck, machine identity and AI agent governance after the Hugging Face breach, a five-phase defense framework with budget and board guidance, a 30-item readiness checklist and a labeled 2027 forecast.
All E-Books
Product-Resident GEO: Why AI Visibility Belongs to Product, Not Marketing
A field guide to the product layer of AI search for B2B SaaS and cybersecurity teams: feature naming, documentation, product data, consistency and agent-ready capability exposure
Why AI visibility (GEO and AEO) is a product discipline, not a marketing tactic. For founders, product managers, product marketers, docs owners and SEO leads at B2B SaaS and security companies: a five-layer product audit, feature naming rules, citable documentation, a product fact model, llms.txt and MCP in honest context, an org chart and operating cadence for a GEO practice, a worked identity example, and a buyer's checklist for GEO tools.
How to Build Authentication In-House: A Practitioner's Guide
Every layer of a production login and single sign-on platform, from password hashing and passkeys to OAuth, SAML, scaling, and regional data, written by someone who built one
A practitioner's guide for CTOs, architects, and security engineers who are building or modernizing authentication in-house. Covers the build vs buy decision, reference architecture, identity data model, Argon2id password hashing, NIST SP 800-63B-4 password policy, sessions and tokens, MFA, passkeys with WebAuthn Level 3, an OAuth 2.0 and OpenID Connect server under RFC 9700, SAML SSO and SCIM, account recovery, login defense, key rotation, scaling, data residency, compliance, operations, a launch checklist, and a phased roadmap.
Mastering Claude Code: The Engineer's Complete Playbook
From first session to shipping at scale: setup, context, CLAUDE.md, skills, subagents, hooks, MCP, role workflows, governance, and team adoption
A practical playbook for engineers, engineering managers, and CTOs using Claude Code, Anthropic's agentic coding tool. Covers setup and permissions, context window management, CLAUDE.md, skills and slash commands, subagents and hooks, MCP servers and plugins, workflows for software, QA, security, DevOps, SRE, and ML engineers, advanced patterns, governance, team adoption, and appendices with copy-ready templates, skills, hooks, and a 30/60/90 day roadmap.
Login Without Friction: The 2026 Passwordless Playbook for Brands
How to balance security and user experience at login, with passkeys, smart MFA, and a practical guide to choosing a passwordless vendor
A playbook for product, security and growth leaders whose login is costing them customers. Covers the revenue case, risk-based friction, NIST SP 800-63B Rev 4 password rules, passkeys and the 2026 FIDO Passkey Index, MFA without fatigue, login and recovery design, vendor selection, a 90-day rollout and a 20-point scorecard.
From Zero to $10K
The Solo Founder's AI Playbook: Build a Real SaaS Company in 60 Days with $1,000
A step-by-step playbook for solo founders who want to go from idea to paying customers in 60 days, with $10K in monthly recurring revenue (MRR) as the stretch target, using AI coding assistants and a $1,000 budget. Covers validation, infrastructure, AI-assisted development, launch, outreach, and scaling, with practical prompts, templates, a tool-pricing reference checked in November 2026, and worked revenue math for young and first-time entrepreneurs.
AI Ethics and Governance in B2B: Marketing, Security, and the Trust Equation
A Practical Framework for Responsible AI in Marketing, Cybersecurity, and Enterprise Operations
A practical guide to AI ethics in B2B, covering AI-powered marketing optimization, cybersecurity marketing, AI agent identity governance, and current regulation, including the EU AI Act timeline and FTC enforcement, updated November 2026.
GEO for Cybersecurity: How Security Vendors Win AI Visibility
A Practical Guide to Getting Your Security Brand Cited by AI Engines
A vertical-specific guide for cybersecurity companies on achieving AI search visibility. Covers CISO buyer behavior, trust-weighted authority models, content architecture for security topics, and a 90-day implementation playbook.
The Practical Guide to AI Search Visibility
How B2B SaaS Companies Can Win Citations in ChatGPT, Perplexity, Google's AI Answers, and Copilot
A practical guide to GEO, AEO and AIO for B2B SaaS: how AI engines retrieve and cite sources, platform-by-platform strategy for ChatGPT, Perplexity, Google AI Overviews and AI Mode, Gemini, Claude and Copilot, a fair look at the tool stack, and a 90-day action plan. Updated November 2026 with sourced data.
The Complete GEO Playbook for B2B SaaS
The Definitive Guide to Earning AI Citations from ChatGPT, Perplexity, Gemini, and Google AI Overviews for B2B SaaS Brands
A practical playbook for B2B SaaS companies that want citations from AI engines. Covers the GEO framework, platform differences, AI crawler and llms.txt setup with code examples, authority building, ten myths tested against published research, and a measurement system for AI visibility.
AI Agents and the Security Nightmare Nobody's Solving
Identity, Authorization, and Trust in the Age of Autonomous AI
A practical book on AI agent security. Covers AI agent identity, MCP authorization and tool poisoning, zero trust for multi-agent systems, vibe coding security debt, and the CISO's guide to AI agent governance. Updated November 2026.
The IAM Career Playbook
From Security Professional to Identity Expert
A career guide to identity and access management, written by the founder of LoginRadius, a CIAM platform that scaled to more than 1 billion users. Covers technical foundations, vendors, non-human and AI agent identity, compliance, career paths, certifications, hands-on projects, and the future of identity.
Cybersecurity Breaches Decoded
What Google's $32B Wiz Deal, Healthcare Ransomware and Chrome Extension Hijacks Teach Us About Modern Security
Real-world breach analyses packaged into a narrative-driven guide that reads like a cybersecurity thriller, with sourced facts and actionable lessons from each incident for CISOs and security teams.
Passwordless & Passkeys: The Enterprise Adoption Guide
Kill the Password: A Practical Guide to Deploying Passkeys, Biometrics & Adaptive Auth at Scale
A practical enterprise guide to going passwordless. Covers the case against passwords, passkey architecture and deployment at scale, adaptive authentication with behavioral signals, hashing foundations for the post-quantum era, an implementation checklist, and a vendor landscape checked in November 2026.
From SEO to GEO
The B2B Marketer's Survival Guide for the AI Search Era
A guide for B2B marketers moving from traditional search to AI-powered discovery. Covers why SEO still feeds AI engines, platform-specific playbooks for ChatGPT, Perplexity, Google AI Overviews and Copilot, RAG explained for marketers, illustrative cybersecurity SaaS case studies, measurement, and a 12-month transformation plan.
Breaking into Cybersecurity
A Practitioner's Guide for Students and Career Changers
A practical career guide for students and career changers, written by a founder and former CISO who has sat on the hiring side. Covers the real job market (BLS, ISC2 and CyberSeek data), the skills that matter, identity, home labs, AI, certifications and a 90-day plan.
AI Agents: A Practical Guide
From Concepts to Production
A practical guide to understanding, building, and deploying AI agents. Covers architecture patterns, tool use, memory systems, multi-agent coordination, RAG, safety guardrails, MCP and A2A, and real-world use cases, with working code examples throughout. Updated November 2026.
The CIAM Buyer's Handbook
Everything You Need to Evaluate, Select & Implement Customer Identity in 2026
The go-to resource for anyone evaluating CIAM solutions: vendor comparisons with pricing checked in November 2026, implementation guides, and the evaluation framework built from scaling a CIAM platform to 1B+ users.
The B2B SaaS Founder's Security Playbook
Enterprise Readiness Without a Security Team
A practical guide for non-security SaaS founders who need to implement security properly without a dedicated security team. Covers auth architecture, SOC 2, enterprise SSO, API security, and the security checklist for fundraising due diligence.
The Zero Trust Playbook for B2B SaaS
From Buzzword to Blueprint: A Founder's Guide to Implementing Zero Trust
A practical guide for B2B SaaS founders, CTOs, and CISOs who need to understand Zero Trust as an implementable architecture, not a vendor pitch. Covers the principles, the NIST architecture, AI agent security, a 5-stage roadmap, and the business case for Zero Trust.
The Cybersecurity Entrepreneur
Building Security Companies That Scale
A practical guide to building and scaling cybersecurity companies, drawn from founding LoginRadius in 2013 and scaling it past 1 billion users, then starting GrackerAI in 2024. Covers the unique GTM challenges of cybersecurity, why fear-driven purchases change everything, and what it takes to earn trust in the security market.