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	<title>Devil&#039;s Night &#187; substitution</title>
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	<description>So many plans, so little time</description>
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		<title>The History of Cryptography (4) &#8212; The Arab Cryptanalysts</title>
		<link>http://foxdie.org/archives/118</link>
		<comments>http://foxdie.org/archives/118#comments</comments>
		<pubDate>Thu, 14 May 2009 19:59:09 +0000</pubDate>
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				<category><![CDATA[History]]></category>
		<category><![CDATA[attack]]></category>
		<category><![CDATA[cryptanalysis]]></category>
		<category><![CDATA[substitution]]></category>

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		<description><![CDATA[How many different simple substitution ciphers exists? We can count them by enumerating all the possible values of each single plain-text letter. First we assign a to one of the 26 possible cipher text letters from A to Z, then assign b to the rest 25 cause one of the letter in cipher alphabet has [...]]]></description>
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		<title>The History of Cryptography (3) &#8212; Caesar Cipher</title>
		<link>http://foxdie.org/archives/96</link>
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		<pubDate>Wed, 13 May 2009 18:59:28 +0000</pubDate>
		<dc:creator>FOX</dc:creator>
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		<category><![CDATA[Caesar Cipher]]></category>
		<category><![CDATA[substitution]]></category>

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		<description><![CDATA[The alternative of transposition is substitution. One of the earliest description of encryption by substitution can be dated back to first century B.C.  During Gallic Wars, the great emperor Julius Caesar, invented the famous Caesar&#8217;s Cypher.

Caesar used secret writing so frequently that Valerius Probus wrote an entire treatise on his ciphers, unfortunately it&#8217;s not [...]]]></description>
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