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	Tabula recta -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-20)
		In (Act of writing in code or cipher) cryptography, the tabula recta is a square table of alphabets, each one made by shifting the previous one to the left.
		Trithemius used the tabula recta to define a (Click link for more info and facts about polyalphabetic cipher) polyalphabetic cipher which was equivalent to (Italian architect and painter; pioneering theoretician of Renaissance architecture (1404-1472)) Leon Battista Alberti's cipher disk.
		All polyalphabetic ciphers based on (Click link for more info and facts about Caesar cipher) Caesar ciphers can be described in terms of the tabula recta.
	www.absoluteastronomy.com /encyclopedia/t/ta/tabula_recta.htm (121 words)

	tabula
		Tabula is a game of the Tables family of games, and is generally thought to be the direct ancestor of modern Backgammon.
		The earliest description of it is in an epigram of Emperor Zeno (476-481CE) given by Agathias of Myrine (527-567CE), where Agathias describes an game in which Zeno through the unfortunate roll of dice goes from a strong position to a very weak one.
		The rules of Tabula were reconstructed in the 19th century by Becq de Fouquieres based upon this epigram.
	www.fact-library.com /tabula.html (113 words)

	Tabula recta (Site not responding. Last check: 2007-10-20)
		The tabula recta was a square table of alphabets, each one madeby shifting the previous one to the left, like this:
		Trithemius used the tabula recta to define a polyalphabetic cipher which was equivalent to Leon Battista Alberti 's cipher disk.
		The tabula recta is often referred toin discussing pre-computer ciphers, including the Vigenère Cipher and Vigenère's less well-known (but much stronger) autokey cipher.
	www.therfcc.org /tabula-recta-274239.html (107 words)

	Tabula recta
		The tabula recta was a square table of alphabets, each one made by shifting the previous one to the left, like this:
		Trithemius used the tabula recta to define a polyalphabetic cipher which was equivalent to Leon Battista Alberti's cipher disk.
		The text of this article is licensed under the GFDL.
	www.ebroadcast.com.au /lookup/encyclopedia/ta/Tabula_recta.html (141 words)

	Crittografia Giovan Batista Belaso
		Un utilizzo della tabula recta, più avanzato rispetto a quello di Johannes Trithemius fu introdotto da Giovan Batista Belaso.
		Si passava quindi a prelevare il secondo carattere della chiave per stabilire quale riga della tabula recta dovesse fungere da alfabeto per il secondo carattere del testo in chiaro e così via.
		Questo sistema d'uso della tabula recta, migliora notevolmente la sicurezza rispetto al metodo originale di Trithemius e rende possibile cambiare la sequenza degli alfabeti semplicemente fornendo una nuova chiave, fra l'altro di facile memorizzazione.
	www.riksoft.com /cribelaso.htm (350 words)

	ipedia.com: Substitution cipher Article (Site not responding. Last check: 2007-10-20)
		In the Vigenère cipher, the first row of the tableau is filled out with a copy of the plaintext alphabet, and successive rows are simply shifted one place to the left.
		(Such a simple tableau is called a tabula recta, and mathematically corresponds to adding the plaintext and key letters, modulo 26.) A keyword is then used to choose which ciphertext alphabet to use.
		This is practically the same as the Vigenère, except the tabula recta is replaced by a backwards one, mathematically equivalent to ciphertext = key - plaintext.
	www.ipedia.com /substitution_cipher.html (2388 words)

	Encyclopedia: Tabula recta
		In cryptography, the tabula recta is a square table of alphabets, each one made by shifting the previous one to the left.
		Image File history File links Vigenere square / tabula recta.
		A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets.
	www.nationmaster.com /encyclopedia/Tabula-recta (943 words)

	Polyalphabetic cipher - Open Encyclopedia (Site not responding. Last check: 2007-10-20)
		Unlike Alberti's cipher, which switched alphabets at random intervals, Trithemius switched alphabets for each letter of the message.
		He started with a tabula recta, a square with 26 alphabets in it (Trithemius, writing in Latin, used 24 alphabets).
		Each alphabet was shifted one letter to the left from the one above it, and started again with A after reaching Z, like this:
	open-encyclopedia.com /Polyalphabetic_cipher (470 words)

	Vigenère cipher -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-20)
		The Vigenère cipher consists of using several Caeser ciphers in sequence with different shift values.
		To encipher, a table of alphabets can be used, termed a (Click link for more info and facts about tabula recta) tabula recta, Vigenère square, or Vigenère table.
		It consists of the alphabet written out 26 times in different rows, each alphabet shifted cyclically to the left compared to the previous alphabet, corresponding to the 26 possible Caesar ciphers.
	www.absoluteastronomy.com /encyclopedia/V/Vi/Vigen%E8re_cipher.htm (931 words)

	blink182.ca - pannos del tabula (Site not responding. Last check: 2007-10-20)
		We couldn't find any results for pannos del tabula in Music.
		Here are some other items you may be interested in.
		tabula publicitari hoarse = rauc hoarseness = raucitate hoax =...
	blink182.ca /pannos-del-tabula/reference/search (134 words)

	Rectos de Tabula (Site not responding. Last check: 2007-10-20)
		Los rectos de Tabula son un término criptográfico inventado por Johannes Trithemius en 1518.
		Trithemius utilizó los rectos del tabula para definir una cifra polyalphabetic que era equivalente al disco de la cifra de Leon Battista Alberti.
		Los rectos del tabula se refieren a menudo en discutir cifras pre-computer incluyendo, la cifra de Vigenère y la cifra menos bien conocida (pero mucho más fuerte) del autokey de Vigenère.
	www.yotor.net /wiki/es/re/Rectos%20de%20Tabula.htm (135 words)

	Breve storia della criptografia (quinta parte)
		Ebbe l’intuizione di indicare, nella costruzione della tabula recta, l’uso di alfabeti non ordinati, ma poi, in nessuno dei suoi esempi, si ha traccia di tale pratica.
		Vediamo un esempio (realizzato utilizzando la tabula recta standard) in cui la prima lettera chiave è la V, e le successive sono il messaggio in chiaro.
		Tale metodo si basa su una tabula recta normale, e su una parola chiave che viene ripetuta per tutto il messaggio da cifrare.
	www.sancese.com /Cripto5.html (1202 words)

	Lexikonia - le informazioni circa Tabula recta (Site not responding. Last check: 2007-10-20)
		la vostra ricerca: "Tabula recta", i nostri risultati tutto il circa "Tabula recta"
		La tabula recta, creata nel 1518 da Johannes Trithemius è spesso chiamata 'tavola di Vigénère' in quanto è stata in seguito utilizzata nell'omonimo cifrario di Vigénère.
		Come si può notare ogni posizione della tavola corrisponde alla somma modulo 26 del carattere a inizio riga e del carattere a inizio colonna, considerando una corrispondenza tra lettere e numeri A=0, B=1, C=2?
	www.lexikonia.org /55735_tabula_recta.htm (749 words)

	Le chiffre indéchiffrable \| MetaFilter
		Blaise de Vigenere did not invent the cipher (he developed a stronger polyalphabetic cipher), Giovan Batista Belaso had done so centuries earlier, in 1553.
		Belaso's implementation harnessed the power of the tabula recta that was squandered by the obvious key progression of those that came before him, and for the first time in seven hundred years, an unbreakable code could be used.
		Charles Babbage successfully cracked Vigenere for the British during the Crimean War, but it was kept secret until Friedrich Kasinski revealed his method a decade later, in 1863.
	www.metafilter.com /mefi/43276 (2764 words)

Tabula recta (Site not responding. Last check: 2007-10-20)

Tabula recta

Tabula recta
article at Free Euro Online Encyclopedia

It uses material from the wikipedia article Tabula recta.

www.eurofreehost.com /ta/Tabula_recta.html (195 words)

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Topic: Tabula recta

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In the News (Wed 25 Nov 09)