Asklemmy

can passphrase reach the strength of a good password

Relevant xkcd: https://xkcd.com/936/

I’d love to hear from someone well versed in security if this is legit or significant weaknesses exist, but the math seems to check out as far as I can tell.

most people use password managers

You don’t know many boomers, do you?

Yes, I use passphrases for stuff like my password manager, my computer login, and my disk encryption. For my login (which I type a lot) it's four words; for occasional stuff like disk encryption it's six. I'm sold on the argument that a passphrase is way easier to memorize compared to a comparably-secure random password.

The number of possible passphrases is the number of words in the dictionary you use to generate passphrases raised to the power of the number of words in your passphrase (assuming a small chance of reusing the same word in a passphrase). I use this command to generate a random phrase using my stock OS word list:

grep -v '[^a-z]' $WORDLIST | shuf --random-source=/dev/urandom | head -n5 | paste -sd ' '

grep -v '[^a-z]' $WORDLIST filters out words with apostrophes or other weirdness. On my system the filtered list is 77,866 words.

For four words, 77,866 ^ 4 ≈ 3.7 × 10^19 possible passphrases.

Compare that to randomly-generated passwords. I'll assume that random lowercase & uppercase letters, numbers, and symbols add up to 46 characters. The number of combinations is 46^n where n is the length of the password. A four-word passphrase is the same order of magnitude as secure as a 12-character password, which has about 9 × 10^19 possible combinations.

I'm sure that if you make up your own passphrases instead of randomly generating them then the security is much lower.

correct horse battery staple?

I made a passphrase for my laptop in bitwarden and didn't think I'd remember the 10 word passphrase but after a few days of typing it I now remember it. All other alphanumeric passwords I would need a keyboard in order to type it out if I remember

I use passphrases for frequently used logins and randomly-generated passwords of varying lengths for everything else. I also use a hardware key and/or 2FA for everything that allows it.

I'm conversationally fluent in a few different languages (enough to order food, greet people and ask directions to the shitter, anyway) and I can swear in another half-dozen languages so I tend to mix'n'match my passphrases with different foreign words. Bonus points for accented characters. That's probably not gonna fool a dictionary-based attack but since I live in a (mostly) English-speaking country, it might make it interesting for the English-only speakers to try guessing.

At work, we're held to the outdated policy set by the IT department so it can be difficult to be creative. On top of that, they force a password change whenever someone sneezes so I see a lot of sticky notes on monitors and under keyboards.

Edit: spelling and grammar.

I do. It's worth it because there are some sites that are so outdated that their version of security is to not allow pasting (or filling in via pw manager) on password fields, so I have to manually type them in. Typing in a passphrase is easier and faster than a random string.

For my personal life I use a password manager, like most people in this thread. For my master password I really want a secure password (LastPass really reinforced the value of that), so I use a passphrase that is then hashed using an algorithm I can do in my head, so it's a long string of high entropy alphanumeric gibberish that I can remember easily.

At work my IT dept seems to be stuck 10 years in the past, so they have now implemented a policy that our passwords must be at least 16 characters. They keep ignoring my suggestions to get some form of corporate password manager, so I have my work passwords stored in a text file that I'm not allowed to have any form of file encryption so it just sits there in my documents folder. It's probably not going to be the source of our company getting penetrated, but I don't consider it secure.

I do like pass phrases because I find them easy to remember, but my current prime work one is really easy to make typos, so I now use the reveal password button more than I ever have before.

I use an open source password manager and long random passwords for most things.

my master password is a long phrase though, as well as any I have to type personally sometimes. passphrases are so much easier to type as well

I found it amusing when the security team in my company sent me parts of my password in plaintext saying it was insecure (because it didn't have special characters in it) and recommended I use a password manager

The account is used for the ancient VPN software and all of our ssh management tools

And windows login if you're using windows.

Yeah good luck using a randomly generated password that you have to type in multiple times everyday

Disk encryption, computer login, and password manager are pass phrase + random characters stored on a pin protected OnlyKey and/or Mooltipass.

Regular passwords are just random characters up to min(max_len, 128).

I use a passphrase in order to get into my password manager, but that's it. Because my password manager handles all the rest of them and makes it way more random than I could ever dream of.

I do use a password manager, and a lot of my passwords are automatically generated piles of random ASCII.

There are of course passwords I have to key manually a lot; especially the master key of my password database. I often use pass phrases for these. The ones I have to commit to memory, or even need to key manually reading with my eyes from my database, or in the case of my Wi-Fi passwords tell to other people, I make these fairly human readable/typeable. Trying to key lFqvC3]gI~l8p2V6TvTY&p in is a pain in the ass even in a font that renders that uppercase I and lowercase L as different glyphs. Something like corrEct_horse battery staPle, well I worked in an underscore and two capitals in something I can still touch type pretty effectively. Don't use correct horse battery staple as a password; it's burned.

I'm a big car guy so I typically use car makes and models but never ones I actually own, usually I'll go with some like SubaruImprezaWrxSti2012 except I scramble the order of the words and throw the year in a random position. This is really easy to remember while also being long and insane enough to be difficult to guess.

https://bitwarden.com/password-strength/

Test it here. Passphrases of 3 words take centuries to crack, without any numbers or capital letters. Passwords with numbers, capital letters, and symbols need ~14 characters to be that secure. If you need to memorize it, a passphrase is far superior. Add in a number, or random capitalization, or a misspelling and your security goes even higher.

Use diceware to generate a nice long nonsense passphrase, and use that for your password manager master password. Keep it written down somewhere until you are sure you've memorized it.