For the first bullet, I usually just do the following: dd if=/dev/urandom ibs=1000 count=1 2>/dev/null | tr -dc '0-9' | fold -w[number of digits you need]

For the first bullet, I usually just do the following: dd if=/dev/urandom ibs=1000 count=1 2>/dev/null | tr -dc '0-9' | fold -w[number of digits you need] For the fourth, I agree with wbond: use bcrypt when possible. Also, slide 27 should probably say 'fingerprint' in the second section.