title: What is the difference between weak and strong resistance
body: <p>I have read some texts about strong collision resistance and weak collision resistance, but I was unable to understand the difference. The only thing I can understand that there is a low probability of collision in hash functions which have weak collision resistance, and a higher probability of collision in strong collision resistance hash functions. I could not understand what is the real thing, what is the significance of these parameters. Can anyone help me on this ?</p>