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<p>as invalid orders.</p>

<p>A nonce may be used to ensure security for a <a href="page.php?w=stream_cipher">stream cipher</a>.  Where the same key is used for more than one message and then a different nonce is used to ensure that the <a href="page.php?w=keystream">keystream</a> is different for different messages encrypted with that key; often the message number is used.</p>

<p>Secret nonce values are used by the <a href="page.php?w=Lamport_signature">Lamport signature</a> scheme as a signer-side secret which can be selectively revealed for</p><p>
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