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The authentication hash appropriately authenticates by ensuring your plaintext Master Password matches the derived authentication hash stored on the server.īy going through such encryption and hashing methods, your Master Password and sensitive vault data are unknown to anyone but you. LastPass uses 256-bit AES encryption/decryption and PBKDF2 derivation function with a secure hash (SHA256), with salting, to transform your Master Password into an encryption key, and then into an authentication hash. The server is LastPass, specifically our servers, which are stored in the cloud.The client is you, particularly the devices you use to access LastPass.Zero-knowledge encryption works by separating your unencrypted data from our servers. This method applies encryption and hashing with salting to generate an encryption key used to encrypt (or decrypt) your vault, where your passwords are stored. Simply put, it means the only person who uses or knows your Master Password is you. Zero-knowledge encryption is a method, including industry-standard algorithms, on which LastPass is built.