Kai Nakamura

62 code snips · on codesnips 5 months

Security Engineer and ethical hacker with 11+ years building secure software and hardening production systems. Expert in application security, secure authentication, cloud...

Posted Security review checklist for production readiness of new services
Posted Signed release artifacts with cosign for software supply chain trust
Posted Email security baseline with SPF DKIM and DMARC records
Posted Incident response severity matrix and first hour checklist
Posted CSP report endpoint for monitoring attempted browser policy violations
Posted Password reset flow that avoids user enumeration and token leaks
Posted Client certificate pinning considerations for mobile apps
Posted Signed and encrypted Rails cookies for tamper resistant state
Posted PostgreSQL hardening with pg_hba and strict role separation
Posted Redis hardening with ACLs protected mode and network isolation
Posted Security focused CORS configuration for browser APIs
Posted Secure webhook endpoint design with replay protection
Posted Web application DAST automation with OWASP ZAP baseline scans
Posted Threat hunting query ideas mapped to MITRE ATT and CK patterns
Posted Certificate transparency checks for unexpected certificate issuance
Posted TOTP based multi factor authentication for sensitive actions
Posted S3 bucket policy that enforces TLS and blocks public reads
Posted Least privilege IAM policy for an application on AWS
Posted Linux privilege escalation checks for suspicious local state
Posted Wireshark display filters that speed up incident triage
Posted tcpdump filters for fast packet capture during investigations
Posted Forensic collection script for volatile host evidence
Posted Suricata IDS rule authoring for suspicious lateral movement
Posted YARA rules for spotting suspicious binaries during triage
Posted DNSSEC zone signing basics for integrity of DNS answers
Posted TLS certificate automation with certbot and strict renewal checks
Posted Mutual TLS between internal services with Nginx
Posted HMAC signed API requests for webhook and partner integrity
Posted ModSecurity WAF rules for common web attack patterns
Posted Structured audit logging for privileged actions
Posted Sanitizing logs so secrets and PII do not leak downstream
Posted Python security audit script for exposed risky filesystem state
Posted sqlmap workflow for approved injection testing
Posted Nmap reconnaissance profiles for safe internal assessments
Posted Fail2ban filters to slow SSH and application abuse
Posted Host firewall rules with nftables for default deny networking
Posted SSH daemon hardening and key based access only
Posted Kubernetes RBAC roles with least privilege service accounts
Posted Kubernetes NetworkPolicy for namespace level traffic control
Posted Trivy image scanning in pull request pipelines
Posted Dockerfile hardening for smaller safer containers
Posted Dependency vulnerability scanning for Ruby and Node projects
Posted Static application security testing with Semgrep in CI
Posted Git secret scanning with pre commit hooks
Posted Secrets management with environment isolation and Vault
Posted Parameterized queries in Python with psycopg
Posted Session cookie hardening for browser based authentication
Posted Core HTTP security headers at the reverse proxy layer
Posted Content Security Policy header design for modern web apps
Posted Secure random token generation for sessions and recovery flows
Posted XXE safe XML parsing with external entity resolution disabled
Posted SSRF mitigation with URL allowlists and egress controls
Posted Preventing path traversal in download endpoints
Posted Hardening file uploads with MIME checks and storage isolation
Posted Input validation with allowlists and explicit schemas
Posted Rate limiting abusive clients with Rack::Attack
Posted OAuth 2.0 Authorization Code with PKCE for public clients
Posted JWT issuance and verification without common footguns
Posted Password hashing with Argon2 and bcrypt migration paths
Posted CSRF protection for Rails and JSON APIs
Posted Cross site scripting defense with output encoding and CSP
Posted SQL injection prevention with unsafe and safe query patterns