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| French diplomat Blaise de Vigenere (1523-1596) introduced a
powerful encryption that uses letters in the Trithemius’s
polyalphabetic encryption as its "key". Even
if the conversion list fell into enemy hands, deciphering
the encryption would be almost impossible because the
solution varied greatly, depending upon the key. |
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| For example: If
"MITSUBISHI" were to be encrypted, using the
key "MISTY", then the key alphabet will be repeated
underneath the plain text alphabet. Next, using the polyalphabetic
letters, the top row will be the plaintext alphabet row,
and the column on the farthest left will be the key alphabet
column. The point at which the plaintext and the key
intersect each other is the encrypted alphabet. Plaintext
alphabet "M" first intersects with encryption
"Y", which intersects with the key "M". |
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| * Because this "polyalphabetic
encryption" chart has been created with the purpose
of making it user-friendly, the list differs from those
in general reference. |
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