Zero Knowledge refers to storage systems that are impossible for the service provider to decrypt. “These encrypted fields remain secured with 256-bit AES encryption and can only be decrypted with a unique encryption key derived from each user’s master password using our Zero Knowledge architecture,” LastPass CEO Karim Toubba wrote, referring to the Advanced Encryption Scheme and a bit rate that’s considered strong. The hackers also copied a backup of customer vault data that included unencrypted data such as website URLs and encrypted data fields such as website usernames and passwords, secure notes, and form-filled data. In Thursday’s update, the company said hackers accessed personal information and related metadata, including company names, end-user names, billing addresses, email addresses, telephone numbers, and IP addresses customers used to access LastPass services. Sensitive data, both encrypted and not, copied At the time, the company said that a threat actor gained unauthorized access through a single compromised developer account to portions of the password manager's development environment and "took portions of source code and some proprietary LastPass technical information." The company said at the time that customers’ master passwords, encrypted passwords, personal information, and other data stored in customer accounts weren't affected.
The revelation, posted on Thursday, represents a dramatic update to a breach LastPass disclosed in August. LastPass, one of the leading password managers, said that hackers obtained a wealth of personal information belonging to its customers as well as encrypted and cryptographically hashed passwords and other data stored in customer vaults.
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