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	<title>Cryptosmith &#187; RC4</title>
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	<description>Authentication, crypto, information security, and life with gadgets - Rick Smith</description>
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		<title>More Matlab and RC4</title>
		<link>http://www.cryptosmith.com/archives/667</link>
		<comments>http://www.cryptosmith.com/archives/667#comments</comments>
		<pubDate>Sat, 06 Jun 2009 02:04:32 +0000</pubDate>
		<dc:creator>Rick (l) Admin</dc:creator>
				<category><![CDATA[Security]]></category>
		<category><![CDATA[Tech Teaching]]></category>
		<category><![CDATA[block cipher]]></category>
		<category><![CDATA[cipher modes]]></category>
		<category><![CDATA[crypto]]></category>
		<category><![CDATA[Matlab]]></category>
		<category><![CDATA[RC4]]></category>

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		<description><![CDATA[A reader asked for more details on the RC4 and block cipher mode functions I wrote in Matlab. To recap, I needed a &#8216;block cipher&#8217; to produce a complete example of how a straight block cipher fails to hide large patterns in the output, and how an appropriate block cipher mode yields something akin to [...]]]></description>
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		<title>Matlab, RC4, and Crypto-Graphics</title>
		<link>http://www.cryptosmith.com/archives/621</link>
		<comments>http://www.cryptosmith.com/archives/621#comments</comments>
		<pubDate>Wed, 13 May 2009 23:09:06 +0000</pubDate>
		<dc:creator>Rick (l) Smith</dc:creator>
				<category><![CDATA[Security]]></category>
		<category><![CDATA[Tech Teaching]]></category>
		<category><![CDATA[block cipher]]></category>
		<category><![CDATA[cipher modes]]></category>
		<category><![CDATA[crypto]]></category>
		<category><![CDATA[Matlab]]></category>
		<category><![CDATA[RC4]]></category>
		<category><![CDATA[stream cipher]]></category>

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		<description><![CDATA[A while back I used graphical images to illustrate why you never, ever want to reuse the keystream of a stream cipher. Recently I&#8217;ve constructed similar examples to show the role of modes in using block ciphers. There&#8217;s a nice set of block mode examples in Wikipedia, but I wanted to include the real result [...]]]></description>
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		<title>Stream Ciphers</title>
		<link>http://www.cryptosmith.com/archives/62</link>
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		<pubDate>Thu, 07 Jun 2007 16:57:14 +0000</pubDate>
		<dc:creator>Rick (l) Smith</dc:creator>
				<category><![CDATA[Security]]></category>
		<category><![CDATA[crypto]]></category>
		<category><![CDATA[one time pad]]></category>
		<category><![CDATA[RC4]]></category>
		<category><![CDATA[stream cipher]]></category>
		<category><![CDATA[xor]]></category>

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		<description><![CDATA[Whenever your browser establishes a “secure” connection to a web site, it encrypts the data. Traditionally, the browser and site use a stream cipher called Rivest Cipher #4 (RC4), although some sites use newer techniques. Stream ciphers use a deceptively simple mechanism: you combine the plaintext data, bit by bit, with “key” bits, using the [...]]]></description>
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