Get the Whitepaper called Hash Collision Attack Vectors on the eD2k P2P Network.
You can download it from the following link: https://packetstormsecurity.com/files/download/88937/hash-collision.pdf
Source: https://packetstormsecurity.com/files/88937/Hash-Collision-Attack-Vectors-On-The-eD2k-P2P-Network.html