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<p>be solved in <a href="page.php?w=polynomial_time">polynomial time</a>. Schemes that can be <a href="page.php?w=provable_security">proven secure</a> using only complexity assumptions are said to be secure in the standard model. Security proofs are notoriously difficult to achieve in the standard model, so in many proofs, cryptographic primitives are replaced by idealized versions. The most common example of this technique, known as the <a href="page.php?w=random_oracle_model">random oracle model</a>, involves replacing a <a href="page.php?w=cryptographic_hash_function">cryptographic hash function</a></p><p>
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