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Reference.org
Correlation attack
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<p>Correlation attacks are a class of <a href="/facts/Cryptography/e94PEVau">cryptographic</a> <a href="/facts/Known-plaintext_attack/MF3CweFd">known-plaintext attacks</a> for breaking <a href="/facts/Stream_ciphers/BxU0aWmJ">stream ciphers</a> whose <a href="/facts/Keystream/xG9YHxld">keystreams</a> are generated by combining the output of several <a href="/facts/Linear-feedback_shift_register/22pktBbX">linear-feedback shift registers</a> (LFSRs) using a <a href="/facts/Boolean_function/uT7E8pqC">Boolean function</a>. Correlation attacks exploit a <a href="/facts/Statistical_hypothesis_testing/yv9RPF6U">statistical</a> weakness that arises from the specific <a href="/facts/Boolean_function/uT7E8pqC">Boolean function</a> chosen for the keystream. While some Boolean functions are vulnerable to correlation attacks, stream ciphers generated using such functions are not inherently insecure. </p>