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    <p>Sorry, I would've commented on the post but haven't got enough rep yet.</p> <p>I'd use SHA256 for my hash algo and keep the iterations around 25. Any more than that and it's really overkill. I use a very similar solution for a framework that I've applied to half a dozen sites now. I chose to create an overly complicated random character generator, but I've used it in a lot of other places, including tokenizing financial data.</p> <p>Another edit: Use a random character generator like this for your salt:</p> <pre><code>function randomChar($length) { $characters = array("A", "B", "C", "D", "E", "F", "G", "H", "J", "K", "M", "N", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "~", "!", "@", "#", "%", "^", "&amp;", "(", ")", ":", "{", "[", "]", "}", "|", "&lt;", "&gt;", ".", ",", "/", "?", "_", "+", "-", "="); $charactersNumber = count($characters); $charactersNumber--; $randomLength = 0; while ($randomLength &lt; $length) { $currentCharacter = $characters[rand(0,$charactersNumber)]; if ($currentCharacter == $previousCharacter) { $currentCharacter = $characters[rand(0,$charactersNumber)]; } $random .= $currentCharacter; $previousCharacter = $currentCharacter; $randomLength++; } return $random; } </code></pre> <p>Response to iteration question: If x = hash(password + salt) and from then on x = hash(x + salt)</p> <p>and 1 evaluation of x takes 10ms, then 2 would take 20 and so on. So... 25 evaluations = 250ms and 1000 = 10,000ms.</p> <p>While it's not going to take 10ms for each one, even .5ms over 1000 is still half a second.</p> <p>If you only accepted alphanumeric passwords, and a password was 8 characters long, each iteration would add 62^8 (if they hadn't yet found the password) more hashes because they would have to do another has for every single combination they tried.</p>
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    1. POLooking to arrive at a usable solution for password salting in a PHP/MySQL application?
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    1. COThanks Alex, useful feedback.
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    2. COIn response to the comments again... hashing the password then hashing the result with a salt is pointless (in most cases), you're just increasing that likelihood that you'll trip yourself up along the way.
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    3. CO@Alex Uhuh, you're speaking my language ;) BTW, in which case **would** a double-salted-hash be needed?
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