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La steganografia da Erodoto a Bin Laden: Viaggio attraverso le tecniche elusive della comunicazione
Paperback
ISBN13: 9781520262222
Publisher: Independently Published
Published: Dec 30 2016
Pages: 246
Weight: 0.81
Height: 0.56 Width: 6.00 Depth: 9.00
Language: Italian
L'intento di questo libro è quello di fornire delle solide basi di studio della steganografia. Esso rappresenta un robusto punto di partenza a livello conoscitivo, che offre una visione globale della steganografia antica e moderna, fornendo chiare e semplici spiegazioni delle tecniche steganografiche utilizzate al giorno d'oggi con relativi esempi di applicazione pratica. Un libro, insomma, che si propone di essere letto da una vasta ed eterogenea utenza e non esclusivamente da lettori di nicchia esperti del settore Ma che cos'è la steganografia?
Dal momento che certe immagini sono composte da milioni di pixel, la sostituzione di soltanto alcuni di essi non sarà apprezzabile ad occhio nudo ma, per leggere il messaggio, servirà uno dei tanti programmi reperibili online. Il risultato è stupefacente: l'immagine originale e quella in cui è stato iniettato un altro file contenente un messaggio di testo, messe a confronto, sono perfettamente identiche, sia in termini di risoluzione grafica sia per quello che concerne il peso, ossia lo spazio occupato sulla memoria di massa.
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