![]() ![]() There are a couple methods you can use to change the password. Changing the password to the same password will simply update the hash without changing anything else. Password hashes will be updated when a user's password is changed. The password hash introduced in MySQL 4.1 is a much stronger hash, and much more difficult to crack. The hash used by MySQL for passwords prior to MySQL 4.1 is now considered to be a weak hash, and can be more easily cracked in the hands of an attacker. Hashing functions have evolved, and become more secure as existing hashing functions have been cracked. Hashes can be "cracked", and converted back to a usable password given enough time, or ingenuity. While hashes aren't supposed to be reversible, it isn't really true. If the hashes match, the user is authenticated, and logged in. A password can be easily converted into a hash, but a hash can't be easily converted back into a password. When a user tries to authenticate with a password, the password provided then undergoes the same hashing operation, and is compared to the hash in the database. A hash would look like a series of meaningless random characters, and is stored in a database as a representation of a password. This differs from something like encryption in that hashing isn't intended to be reversed. Hashing is a process by which a string of characters (a password in this case) is mathematically transformed into a cryptographically secure hash. Converting passwords to a non-human readable form is where hashing comes in. In the event of a security breach, this prevents attackers from having plaintext passwords that can be used to easily access user accounts. Passwords stored in a database (if done responsibly) are not stored in a human readable form. Randomizing the password for MySQL users can prevent websites from connecting to databases properly, and effectively bring the site down. When upgrading to MySQL version 5.6 (or the MariaDB equivalent) or higher, MySQL will randomize any passwords using an old password hash. MySQL continued to support the old MySQL password hashes for compatibility reasons until MySQL 5.6. With the release of MySQL 4.1, the password hashing mechanism was updated to produce more secure passwords.
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