I need a fast hashing function for the purpose of unique identification (not security). How many different, say, 100 character strings can I hash with md5 before hitting a collision? What about sha1?

Security researchers have achieved the first real-world collision attack against the SHA-1 hash function, producing two different PDF files with the same SHA-1 signature. This shows that the algorithm ...

A design flaw in the decades-old RADIUS authentication protocol allows attackers to take over network devices from a man-in-the-middle position by exploiting MD5 hash collisions. The “secure enough” ...