I guess you should follow that Crypto StackExchange question.<p><a href="http:&#x2F;&#x2F;crypto.stackexchange.com&#x2F;questions&#x2F;29695&#x2F;what-is-a-freestart-collision" rel="nofollow">http:&#x2F;&#x2F;crypto.stackexchange.com&#x2F;questions&#x2F;29695&#x2F;what-is-a-fr...</a>