Most lightweight way to create a random string and a random hexadecimal number
<p>what is the most lightweight way to create a random string of 30 characters like this ? :</p>

<p>ufhy3skj5nca0d2dfh9hwd2tbk9sw1</p>

<p>and an hexadecimal number of 30 digits like this ?:</p>

<p>8c6f78ac23b4a7b8c0182d7a89e9b1</p>
