TL;DR: Last Pass is broken. All passwords at the time of the breach were taken. They also got internal secrets from a laptop and can now probably throw computational power at anything they want to decrypt.
Switch. Do not use. Change everything you have if you were using it. Treat everything as breached.
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Brute forcing encrypted data takes a monumental and in most cases nonexistent amount of computational power.
I don’t expect it to stay that way, but realistically speaking it’s not something to worry about.
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not in this case. lastpass, like all the other password managers i know of and a bunch of other cryptographic services, don't handle the master passphrase in plaintext when theyre receiving it from the app or browser or whatever, so at worst when they apply it to the encrypted block of data that represents the users other passwords it's salted, hashed and expanded out to the length required by the encryption strength. at that point it doesn't matter how strong or weak the master password that was used is or isn't.
for the purposes of brute forcing the encrypted file.
if they're doing the absolute bare minimum to have the user data in a file encrypted by the master password.
it really seems like im defending those ding dongs so uhh... let me be clear: i haven't used lastpass for about seven years now.