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Security Patterns: Encrypted Client-Side Key Storage

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Encrypt and protect API keys in the browser.

Software Engineering#browser#api-keys#indexeddb#key-management#encrypt#aes-gcm#web-crypto
Authordzhechko
Version1.0.0
Installs0

System Documentation

What problem does it solve?

API keys exposed in the browser pose a risk; this pattern encrypts keys client-side so plaintext keys are not stored or sent insecurely.

Core Features & Use Cases

  • Client-side encryption of API keys using AES-GCM 256-bit via the Web Crypto API.
  • On-demand decryption in memory with per-request proxying and an auto-lock mechanism after 30 minutes.
  • BYOK workflow to encrypt user keys and decrypt them only when needed.

Quick Start

Derive a master key from a password, encrypt the API key with AES-GCM, and store the ciphertext and IV in IndexedDB, then decrypt per-request as needed.

Dependency Matrix

Required Modules

None required

Components

Standard package

💻 Claude Code Installation

Recommended: Let Claude install automatically. Simply copy and paste the text below to Claude Code.

Please help me install this Skill:
Name: Security Patterns: Encrypted Client-Side Key Storage
Download link: https://github.com/dzhechko/2026-jan-pu-opus-clone-01/archive/main.zip#security-patterns-encrypted-client-side-key-storage

Please download this .zip file, extract it, and install it in the .claude/skills/ directory.
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