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Home > Art, Film & Photography > Cifrari Classici: Cifrario a Sostituzione, Manoscritto Voynich, de Componendis Cifris, Cifrario a Griglia, Cifrario a Trasposizione
Cifrari Classici: Cifrario a Sostituzione, Manoscritto Voynich, de Componendis Cifris, Cifrario a Griglia, Cifrario a Trasposizione

Cifrari Classici: Cifrario a Sostituzione, Manoscritto Voynich, de Componendis Cifris, Cifrario a Griglia, Cifrario a Trasposizione


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About the Book

Fonte: Wikipedia. Pagine: 39. Capitoli: Cifrario a sostituzione, Manoscritto Voynich, De Componendis Cifris, Cifrario a griglia, Cifrario a trasposizione, Cifrario di Vigenere, Cifrario Beale, Cifrario Playfair, Cifrario ADFGVX, Cifrario di Hill, Cifrario VIC, Cifrario di Cesare, Cifrario nichilista, Cifrario di Vernam, Disco cifrante, Scacchiera di Polibio, Scacchiera a diffusione, Tabula recta, ROT13, Cifrario D'Agapeyeff, Cifrario pigpen, Atbash, Libro codice, Scitala, Cifrario Dorabella, Cifrario a staccionata, Alfabeto carbonaro, Cifrario polialfabetico, Cifrario monoalfabetico. Estratto: In crittografia un cifrario a sostituzione e un metodo di cifratura in cui ogni unita del testo in chiaro e sostituita con del testo cifrato secondo uno schema regolare; le "unita" possono essere singole lettere (il caso piu comune), coppie di lettere, sillabe, mescolanze di esse, ed altro. Il destinatario decifra il messaggio applicando una sostituzione invertita. I cifrari a sostituzione sono simili ai cifrari a trasposizione con la differenza che questi ultimi operano ricombinando le unita del testo in chiaro in un ordine differente e di solito piu complesso ma lasciandole comunque inalterate. Nei cifrari a sostituzione, invece, le unita del testo in chiaro sono riallocate nel testo cifrato nella stessa sequenza ma vengono pero alterate. Esistono diversi tipi di cifrari a sostituzione: se il cifrario opera su singole lettere, e detto cifrario a sostituzione semplice; se opera su gruppi di lettere piu grandi e detto cifrario poligrafico. Un cifrario monoalfabetico utilizza sostituzioni fisse sull'intero messaggio mentre un cifrario polialfabetico usa invece differenti schemi di sostituzione ed ogni lettera del testo in chiaro e trattata con un differente alfabeto secondo uno schema stabilito dalla chiave segreta. Il ROT13 e un cifrario di Cesare, un tipo di cifrario a sostituzione molto semplice. Nel ROT13 l'alfabeto e ruotato di 13 posizioni.La sostituzione operante su ...


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Product Details
  • ISBN-13: 9781231926703
  • Publisher: Books LLC, Wiki Series
  • Publisher Imprint: Books LLC, Wiki Series
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Weight: 91 gr
  • ISBN-10: 1231926708
  • Publisher Date: 29 Jul 2011
  • Binding: Paperback
  • Language: Italian
  • Returnable: N
  • Sub Title: Cifrario a Sostituzione, Manoscritto Voynich, de Componendis Cifris, Cifrario a Griglia, Cifrario a Trasposizione
  • Width: 189 mm


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