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In the past few years, there have been significant research advances in the analysis of hash functions and it was shown that none of the hash algorithm is secure enough for critical purposes whether it is MD5 or SHA-1. Nowadays scientists have found weaknesses in a number of hash functions, including MD5, SHA and RIPEMD so the purpose of this paper is combination of some function to reinforce these functions and also increasing hash code length up to 256 that makes stronger algorithm against collision attests.
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