
<ul>
<li><p>You could rehash on delete</p></li>
<li><p>You could put in a ‚Äòplaceholder‚Äô or ‚Äòsentinel‚Äô value</p>
<ul>
<li><p>gets filled with these quickly</p></li>
<li><p>perhaps rehash after a certain number of deletes</p></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>has functions</p>
<ul class="simple">
<li><p>MD5 is a good hash function (given a string or file contents)</p>
<ul>
<li><p>generates 128 bit hash</p></li>
<li><p>when you download something, you download the MD5, yo