EthSign Keychain is a Chrome extension developed by EthSign that serves as a credential manager for Web3. This free program allows users to store and protect their login credentials using their MetaMask wallet.

The key feature of EthSign Keychain is its use of encryption to ensure the security of stored credentials. It utilizes the entropy generated from the user's MetaMask seed phrase to provide the first layer of encryption. Additionally, users have the option to add a second password-based layer of encryption for added security.

One of the notable capabilities of EthSign Keychain is the ability to sync credentials across devices. With syncing enabled, any MetaMask installation using the user's seed phrase can securely retrieve and decrypt the stored credentials. The program also allows for easy export and import of credentials between different MetaMask accounts, facilitating credential sharing between accounts and devices without the need for syncing.

EthSign Keychain also provides a registry for secure message passing between users, ensuring that data encryption can only be decrypted by the intended recipient.

The program consists of two layers: a MetaMask Snap extension and the Chrome extension itself. The snap handles the processing of sensitive information, including credential encryption and remote syncing. The Chrome extension serves as the interface for interacting with the credential state. It offers features such as form submission detection, login form autofill capabilities, and the ability to manually add, edit, and delete password entries.

Please note that EthSign Keychain requires the installation of MetaMask in the Chrome browser to function properly. However, it is unable to connect to MetaMask on elevated Chrome pages.

Overall, EthSign Keychain provides a secure and convenient solution for managing and protecting login credentials in the Web3 environment.