note 54608 added to security.database.storage

MD5 is decent and has been around for a while, but SHA-256, 384, 512, and to a lesser degree, SHA-1(160) are more secure. My best advice is to be creative. Make it so that if the digests/hashes are stolen, then it's difficult to reverse engineer it, both computationally difficult and tough enough that a user can't use a readily-availible program to brute force an MD5 hash. (such as md5brute.exe) Try using combinations to make a unique digest, like: SHA512(SHA512(SHA512(MD5(password + random_salt + "SALT1") + "SALT2" + MD5(random_salt)))) Now of course the more complicated it is, the slower it will run and the tougher it will be for you to troubleshoot it until it's foolproof, but it will be far harder for an attacker. Also note that a random salt must be recorded with the digest. The point is that if just 1 or just 2 of the parts (algorithm, hashes, random salts) are recovered, nothing can be done. If all 3 are recovered, then the person will still have to analyze the code, make their own program (can't just download something), and wait for it to bruteforce it. If all 3 parts are stored separately, it is far more difficult. A simple MD5 hash can be broken in minutes or hours, but something more complex will give an attacker a very cold shoulder, and he will see that as a clue that you are not an easy target. ---- Manual Page -- http://www.php.net/manual/en/security.database.storage.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+54608 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+54608&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+54608&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+54608&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+54608&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+54608&report=yes&reason=non-english Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+54608&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+54608&report=yes Search -- http://master.php.net/manage/user-notes.php