The key used to protect the data (before it is sent to 1Password.com) is generated as 100,000 iterations of PBKDF2-HMAC-256(Master Password + Secret Key). The

The key used to protect the data (before it is sent to 1Password.com) is generated as 100,000 iterations of PBKDF2-HMAC-256(Master Password + Secret Key). The most important part here is the Secret Key which provides additional 128 bits of entropy. https://1password.com/security/ https://1password.com/security/