The Olaf Happy Hallothanksmas shirt PHP password function can foresee that. Well, especially the password_hash () function that stores the algorithm, the salt if used, and the hashing, not just the pure hash result. so password_verify knows what to use for verification. And when you think this is a security breach. No, knowing all the details needed to recalculate an existing password, given the correct password, that’s how the password is verified, and so the login works, you don’t set it secret Just as not putting salt into the code as a separate object, the password hash should have its own salt, so you also store i, otherwise, you also weaken the salt mechanism of the hash. So just see details about PHP’s verify_hash () function, even if you use another platform, PHP has that correct infrastructure.
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The Olaf Happy Hallothanksmas shirt way changing the hashing algorithm even happens automatically with PHP updates, because of the default changes. You can override it manually, to actively choose argon2i or argon2id while I’m writing this article, while the default “only” is bcrypt. But do it with the responsibility of upgrading yourself as much as possible. If you never do so, you can stay with the original choice and rollback after the upgrades that occurred from PHP upgrades. Now, the step of narrowing the gap of calculating a new hash is only possible at login, you need a password for that, the hash you have cannot be hashed again. You do the usual password_verify and also use password_get_info to see if the algorithm used should be phased out, if so, you can use the password you have and calculate the new hash.
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This can be Olaf Happy Hallothanksmas shirt done simply as part of any login, so the hash functions will upgrade with PHP’s default change or your own decision about what to use, not just in a moving phase. Nothing will move all hashes at once, this is the whole point of them without you knowing the password. If there is some special reason such as a violation, it is also necessary to ask the user to choose a new password, when the old hash of their password is known, the more powerful algorithm now stores more hashes. Nor does more help. is resistant to cracking, if the hash is violated can reveal the password. In response to users whose cookies never expire or other “remember me” mechanisms…. Yes, notify your users that their password change is necessary and their tokens will be disabled for security reasons. Users should obviously still have a way in, i.e. a forgotten password mechanism has to be in place and / or you think a way for their token to be a stronger proof of authentication. Usually not, since their security is limited by client-side memory and all kinds of software that has access there.