Data Encryption

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.

skills.sh installs: 616
GitHub stars: 379
last updated: Aug 21, 2026

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Install

$ npx -y skills add aj-geddes/useful-ai-prompts --skill data-encryption --agent claude-code

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Files

Overview

Implement robust encryption strategies for protecting sensitive data at rest and in transit using industry-standard cryptographic algorithms and key management practices.

When to Use

Sensitive data storage
Database encryption
File encryption
Communication security
Compliance requirements (GDPR, HIPAA, PCI-DSS)
Password storage
End-to-end encryption

Quick Start

Minimal working example:

// encryption-service.js
const crypto = require("crypto");
const fs = require("fs").promises;

class EncryptionService {
  constructor() {
    // AES-256-GCM for symmetric encryption
    this.algorithm = "aes-256-gcm";
    this.keyLength = 32; // 256 bits
    this.ivLength = 16; // 128 bits
    this.saltLength = 64;
    this.tagLength = 16;
  }

  /**
   * Generate a cryptographically secure random key
   */
  generateKey() {
    return crypto.randomBytes(this.keyLength);
  }

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