title: PBKDF2 recommended key size?
body: <p>My function is as follows:</p>
  
  <pre><code>pbkdf2($raw_pw,$salt,1000,128)
  </code></pre>
  
  <p>1000 is the number of passes, and 128 is the key size. The function returns a binary key which I use base64 to store it in the database.</p>
  
  <p>My question is: what's the recommended keysize and salt size for pbkdf2 using sha512?</p>
  
  <p>will a keysize of 32 be just as secure as a keysize of 128?</p>