I am learning Hash Algorithms and in a presentation (PDF) about these algorithms I read that:
Length of $h(m)$ much shorter then length of $m$.
Now my question is:
What if we talk about an empty string, is it true that hash length is shorter than the length of message?
I searched the internet and found that:
The MD5 Hash of an empty string is:
d41d8cd98f00b204e9800998ecf8427e