Babbage et Kasiski comprirent que des répétitions de cette sorte leur offraient la prise dont ils avaient besoin pour attaquer Vigenère. Ces séquences redondantes peuvent indiquer deux ...
In 1854, Sir Charles Wheatstone invented the cipher known as "Playfair," named for his friend Lyon Playfair, first Baron Playfair of St. Andrews, who popularized and promoted the cipher.
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