- A
polyalphabetic cipher is a substitution,
using multiple substitution alphabets. The Vigenère
cipher is
probably the best-known
example of a polyalphabetic...
-
message security is
usually less than
might have been.
Other notable polyalphabetics include: The
Gronsfeld cipher. This is
identical to the Vigenère except...
- transposition,
polyalphabetic substitution, and a kind of "additive" substitution. In
rotor machines,
several rotor disks provided polyalphabetic substitution...
- this process. The Vigenère
cipher is
therefore a
special case of a
polyalphabetic substitution.
First described by
Giovan Battista Bellaso in 1553, the...
- is
classed as a type of
monoalphabetic substitution, as
opposed to
polyalphabetic substitution. The
Caesar cipher is
named after Julius Caesar, who, according...
-
changes of
electrical path
through an
Enigma scrambler implement a
polyalphabetic substitution cipher that
provides Enigma's security. The
diagram on...
- the substitution. By this means, a
rotor machine produces a
complex polyalphabetic substitution cipher,
which changes with
every key press. In classical...
-
using the
frequency analysis technique until the
development of the
polyalphabetic cipher, most
clearly by Leon
Battista Alberti around the year 1467,...
-
effective attack against polyalphabetic substitution ciphers.
Leone Battista Alberti, polymath/universal genius,
inventor of
polyalphabetic substitution (more...
- symbols. This
became known as the
Alberti Disk and was the very
first polyalphabetic cipher in history. Alberti's disk also
helped develop the monoalphabetic...
