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<p>the result is a <a href="page.php?w=stream_cipher">stream cipher</a>. With a key that is <a href="page.php?w=Hardware_random_number_generator">truly random</a>, the result is a <a href="page.php?w=one-time_pad">one-time pad</a>, which is <a href="page.php?w=Information-theoretic_security">unbreakable in theory</a>.</p>

<p>The XOR operator in any of these ciphers is vulnerable to a <a href="page.php?w=known-plaintext_attack">known-plaintext attack</a>, since plaintext  ciphertext = key.It is also trivial to flip arbitrary bits in the decrypted</p><p>
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