[George Danchev] > Even using weak hash sum algorythms you can easily make the hash > collider life tremendously difficult by simply having more than one > (ok two should be enough) hash sums generated with _different_ > (weak?) algorythms on the same entity. What you have just defined is a new hash algorithm of M+N bits. Why not instead use an existing hash algorithm with M+N bits? If nothing else, the attack is likely to be less parallelizable.
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