This covers the essentials for implementing encryption in your applications, from AES-256-GCM for data at rest to TLS configuration for transit security. You get working examples in Node.js and Python, plus specific guides for database encryption and key management. The best practices section is solid on what not to do (no ECB mode, no reusing IVs), which honestly matters more than the happy path when it comes to crypto. If you're building anything that handles sensitive data or needs to meet compliance requirements like HIPAA or PCI-DSS, this gives you the standard patterns without having to research cryptographic primitives yourself.
npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill data-encryption