What is vault?

Vault is a centralized tool for storing and controlling access to sensitive information like passwords, API keys, database credentials, and certificates. Instead of scattering secrets across different systems or storing them in plain text, you keep them all in one secure place that encrypts everything and tracks exactly who accessed what and when. The core problem it solves is that modern applications need access to dozens of different secrets across databases, cloud services, and third-party APIs. Managing who gets which secrets, rotating them regularly, and knowing when someone accessed them becomes a nightmare without a dedicated system. Vault acts as a gatekeeper: applications ask Vault for the credentials they need, Vault grants temporary access with automatic expiration, and logs everything for security audits. What makes Vault particularly powerful is its flexibility. It can store static secrets (like a password you set once) or generate dynamic ones on the fly, for example, creating temporary AWS credentials for an app to use for exactly one hour, then automatically deleting them. It can also encrypt and decrypt data without storing it, letting developers protect sensitive information in databases without building their own encryption. When you need to revoke access quickly (say, after a security incident), you can invalidate entire groups of secrets at once across your whole system. Teams of any size use Vault when they care about security and audit trails. A small startup might use it to safely share database passwords between team members. A large enterprise uses it to manage credentials for thousands of applications and services while staying compliant with security regulations. DevOps engineers especially rely on it to automate secret distribution across cloud infrastructure and containers. The project is written in Go and designed to be developed and extended by engineers who want to add support for new types of secrets or authentication methods. The README emphasizes the project takes security seriously and invites responsible disclosure of any vulnerabilities.