While the company insists that your login information is still secure, some cybersecurity experts are heavily criticizing its post, saying that it could make people feel more secure than they actually are and pointing out that this is just the latest in a series of incidents that make it hard to trust the password manager.“LastPass’s claim of ‘zero knowledge’ is a bald-faced lie.” He also highlights LastPass’ admission that the leaked data included “the IP addresses from which customers were accessing the LastPass service,” saying that could let the threat actor “create a complete movement profile” of customers if LastPass was logging every IP address you used with its service.“LastPass’s claim of ‘zero knowledge’ is a bald-faced lie,” he says, alleging that the company has “about as much knowledge as a password manager can possibly get away with.” LastPass claims its “zero knowledge” architecture keeps users safe because the company never has access to your master password, which is the thing that hackers would need to unlock the stolen vaults.“I think most people envision their vault as a sort of encrypted database where the entire file is protected, but no — with LastPass, your vault is a plaintext file and only a few select fields are encrypted.” Palant also notes that the encryption only does you any good if the hackers can’t crack your master password, which is LastPass’ main defense in its post: if you use its defaults for password length and strengthening and haven’t reused it on another site, “it would take millions of years to guess your master password using generally-available password-cracking technology” wrote Karim Toubba, the company’s CEO.Meanwhile, Palant criticizes the company’s post for painting its password-strengthening algorithm, known as PBKDF2, as “stronger-than-typical.” The idea behind the standard is that it makes it harder to brute-force guess your passwords, as you’d have to perform a certain number of calculations on each guess."