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      <title>CIFRARIO DI VIGENÈRE by Maria Ercolani</title>
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      <pubDate>2018-05-20 15:52:11 UTC</pubDate>
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         <title>COS&#39;È IL CIFRARIO DI VIGENÈRE?</title>
         <author>mariaercolani035</author>
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         <description><![CDATA[<div>Il cifrario di Vigenère è un semplice <strong>codice</strong> di <strong>sostituzione polialfabetica</strong> (un dato carattere del testo chiaro viene cifrato sempre con caratteri diversi in base ad una parola segreta da concordare).</div>]]></description>
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         <pubDate>2018-05-20 16:00:08 UTC</pubDate>
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         <title>COME SI CODIFICA?</title>
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         <description><![CDATA[<div>Usiamo una <strong>parola chiave</strong>, anche chiamata <strong>verme</strong>, <strong>COMPUTER</strong>, ed una parola da codificare, <strong>INFORMATICA</strong>. Per cifrare la lettera<strong> I</strong> di <strong>INFORMATICA</strong>, si dovrà individuare la colonna della <strong>I</strong>, e scendere lungo la colonna fino alla riga della lettera <strong>C </strong>del verme <strong>COMPUTER</strong>, in questo caso la lettera codificata sarà <strong>K</strong>. Sarà così con tutte le altre lettere, però abbiamo un verme di 8 lettere ed una parola da codificare di 11 lettere, quando arriviamo alla <strong>R </strong>del verme, per codificare la <strong>T </strong>di <strong>INFORMATICA</strong>, dovremo iniziare a codificare di nuovo dalla <strong>C </strong>di <strong>COMPUTER </strong>e così via. Mentre per decodificare, ad esempio, la lettera <strong>K </strong>del testo cifrato, si dovrà cercare nella colonna della lettera <strong>C </strong>del <strong>verme </strong>questa lettera, e poi scorrere verso sinistra verso la colonna, in questo caso è la <strong>I</strong>.</div>]]></description>
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         <pubDate>2018-05-20 16:48:02 UTC</pubDate>
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         <title>COME È NATO QUESTO CIFRARIO?</title>
         <author>mariaercolani035</author>
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         <description><![CDATA[<div>La nascita di questo cifrario viene attribuita ad un famoso <strong>diplomatico francese </strong>del <strong>XVII </strong>secolo <strong>Blaise de Vigenère</strong>. Ma forse non è così... si dice che fosse stato creato da <strong>due persone</strong>, e lui non faceva parte di queste. È stato solo colui che ha dato l'<strong>idea </strong>di questo cifraio.</div>]]></description>
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         <pubDate>2018-05-21 14:11:42 UTC</pubDate>
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         <title>BLAISE DE VIGENÈRE</title>
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         <title>CODIFICA DI &quot;INFORMATICA&quot;</title>
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         <description><![CDATA[<div>&nbsp; &nbsp; <strong>KBRDLFEKKQM</strong></div>]]></description>
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         <title>DECODIFICA DI &quot;INFORMATICA&quot;</title>
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