keychain

Keychain is a command line tool for managing SSH keys and other authentication credentials on macOS and Linux systems. It securely stores and manages private keys, certificates, and other sensitive information used for authentication across various platforms.

1. Keychain is designed to provide a convenient and centralized way to store and securely access authentication credentials.
2. It can be used for managing SSH key pairs, SSL/TLS certificates, GPG keys, and other types of authentication credentials.
3. Keychain encrypts and protects the stored credentials using the user's login password or a passphrase, ensuring that they are not accessible to unauthorized users.
4. It integrates with the OpenSSH client, allowing users to easily add their SSH private keys to the keychain and automatically use them for authentication.
5. Keychain can automatically unlock and provide SSH keys to the SSH agent, making it convenient to use SSH without constantly entering passwords or passphrases.
6. It supports multiple keychains, allowing users to organize their credentials into different keychains based on their requirements.
7. Keychain can generate new key pairs, as well as import existing keys from various formats such as PKCS#12, OpenSSH, etc.
8. It provides command line tools like ssh-keychain and security for managing keychains, adding and removing keys, and retrieving stored credentials.
9. Keychain can also integrate with other applications, such as Git, that rely on SSH authentication, providing a seamless experience for developers.
10. Overall, Keychain simplifies the management and use of authentication credentials, making it easier for users to securely access remote systems and services.