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<p>a security proof based on the difficulty of the <a href="page.php?w=quadratic_residuosity_problem">quadratic residuosity problem</a>. Since the only known way to solve that problem is to factor the modulus, it is generally regarded that the difficulty of <a href="page.php?w=integer_factorization">integer factorization</a> provides a conditional security proof for the Blum Blum Shub algorithm. However the algorithm is very inefficient and therefore impractical unless extreme security is needed.<br/>
* The <a href="page.php?w=Blum-Micali_algorithm">Blum-Micali algorithm</a></p><p>
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