The guessing problem, without math
If unlocking a vault were as cheap as checking a tick-box, a thief with a stolen copy of locked data could try every password in a huge list very fast. Fast checks favor the attacker. Slow, memory-hungry checks favor you.
Argon2id is designed to need real time and real memory for every guess. Your phone does it once when you unlock. A guessing farm has to pay that cost again and again. That is not a force field. It is a speed bump the size of a hill.
Why “ID” is in the name
There are a few Argon2 flavors. Argon2id is a blend that is harder to cheat with two common attack styles. You do not pick this in a menu. Stax Pass uses it to derive protection from your main password.
Derived means: your password goes in, key material comes out, and the original password is not sitting there as a spare copy. Combined with OPAQUE at sign-in, the design is aiming not to treat your password like a reusable server database value.
What you still must do
Argon2id cannot save a main password that is “password123” or the same phrase you use for email. A cheap secret plus an expensive recipe is still a cheap secret. Make the manager password long and unique. Keep the recovery phrase offline.
If someone watches you type, or you paste the password into a fake page, the recipe never gets a chance. Layers stack. They do not replace each other.
Is this worth paying for?
People pay for deadbolts even though a window can still break. Argon2id is a deadbolt on guessing. The monthly price of Stax Pass is for the whole vault—unique passwords, sealed records, and this slow-guessing step—not for a single acronym. A trial lets you live with it before you pay.
Take this with you
- Argon2id makes each password guess costly in time and memory.
- It helps only if your main password is not a reused favorite.
- You still protect the phrase and where you type.
Common questions
Why does unlock take a moment?
A short wait on your device is part of the cost that slows a guessing computer. It should still feel normal, not like a freeze.
Is this hashing?
It is a password-based key-derivation function—related to hashing, but tuned to be slow and memory-hard on purpose. Fast hashes are the wrong tool for human passwords.
Can I turn it up myself?
Stax Pass chooses settings so protection is strong and the app still usable. You should not have to be a tuner.