Salt values are different for every user and input. Salting takes one input, like your Master Password or an authentication hash, and makes it more unique and even harder to match. When you dont have to remember the password, this isnt necessary turn off this option. The hash is stored server side for authentication purposes. LastPass and several others default to avoiding ambiguous character pairs like the digit 0 and the letter O. LastPass encrypts your vault data to protect it from bad actors.Ī one-way function that converts data – like your plaintext Master Password – to a unique, unreadable output called a hash. All these measures protect you against server-side attacks.Ī two-way function that converts plaintext (like your Master Password) to unreadable text. 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. Once authentication is successful and the vault is retrieved, we use AES 256 bit with the encryption key to decrypt (and encrypt) your vault. Then we perform one more iteration and use this as a separate authentication construct. LastPass uses PBKDF2-SHA256 with 600,000 iterations to derive an encryption key. Two things happen to your Master Password. 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.
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