Proton has never experienced a security breach. The robust security model of Proton Pass, along with all other Proton services, is designed to offer multiple layers of protection. This includes Transport Layer Security (TLS), Secure Remote Password (SRP) protocol, and end-to-end encryption, among others. The core of Proton Pass' security architecture lies in its end-to-end encryption model, which encrypts not only passwords but all fields, including usernames, web addresses, and notes. This encryption is performed locally on the user's device, ensuring that Proton servers never have access to unencrypted keys, data, or credentials.