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Cryptography

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    $\begingroup$ Thanks for your brainstorming of a new "solution" ... do you have any analysis why this is better than other ways of combining them? In which way the first or final some bits are special here? $\endgroup$ Commented Jul 5, 2013 at 8:54
  • $\begingroup$ Okay, it has a good avalanche property, it's good against length extension attacks, and it has the properties of both h1 and h2 (only use for good h1/h2). The first/final bits are special because they combat against length-extension attacks. $\endgroup$ Commented Jul 6, 2013 at 22:43
  • $\begingroup$ You can also switch between h2,h3,h4,...,hn, and switch to one on certain conditions. $\endgroup$ Commented Jul 6, 2013 at 22:46
  • $\begingroup$ And why did anyone downvote this answer? It was a great asnwer though. $\endgroup$ Commented Jul 6, 2013 at 23:02
  • $\begingroup$ I forgot something. A collision in $h_1$ doesn't necessarily mean a collision in the resultant hash $h_p$, with probability $2^{-224}$. And a collision in $h_2$ doesn't mean a collision in the resultant hash $h_p$ with The probability $2^{-256}$. $\endgroup$ Commented Jul 14, 2013 at 21:50