NAME Crypt::Polybius - implementation of the Polybius square SYNOPSIS use Crypt::Polybius; # 1 2 3 4 5 # 1 A B C D E # 2 F G H I/J K # 3 L M N O P # 4 Q R S T U # 5 V W X Y Z # # ATTACK -> 11 44 44 11 13 25 # AT -> 11 44 # DAWN -> 14 11 52 33 my $square = Crypt::Polybius->new; print $square->encipher('Attack at dawn.'), "\n"; DESCRIPTION This module provides an object-oriented implementation of the Polybius square, or Polybius checkerboard. This cipher is not cryptographically strong, nor completely round-trip-safe. Roles This class performs the following roles: * Crypt::Role::LatinAlphabet * Crypt::Role::CheckerboardCipher * MooX::Traits Constructors `new(%attributes)` Moose-like constructor. `new_with_traits(%attributes, traits => \@traits)` Alternative constructor provided by MooX::Traits. Attributes The following attributes exist. All of them have defaults, and should not be provided to the constructor. `square` An array of arrays of letters. Provided by Crypt::Role::CheckerboardCipher. `square_size` The length of one side of the square, as an integer. Provided by Crypt::Role::CheckerboardCipher. `encipher_hash` Hashref used by the `encipher` method. Provided by Crypt::Role::CheckerboardCipher. `decipher_hash` Hashref used by the `decipher` method. Provided by Crypt::Role::CheckerboardCipher. Object Methods `encipher($str)` Enciphers a string and returns the ciphertext. Provided by Crypt::Role::CheckerboardCipher. `decipher($str)` Deciphers a string and returns the plaintext. Provided by Crypt::Role::CheckerboardCipher. `preprocess($str)` Perform pre-encipher processing on a string. `encipher` calls this, so you are unlikely to need to call it yourself. The implementation provided by Crypt::Role::LatinAlphabet uppercases any lower-case letters, and passes the string through Text::Unidecode. It also replaces any letter J with I because the former is not found in the alphabet provided by Crypt::Role::LatinAlphabet. `alphabet` Returns an arrayref of the known alphabet. Provided by Crypt::Role::LatinAlphabet. Class Method `with_traits(@traits)` Generates a new class based on this class, but adding traits. Crypt::Role::ScrambledAlphabet is an example of an interesting trait that works with this class. BUGS Please report any bugs to . SEE ALSO . Crypt::Polybius::Greek. AUTHOR Toby Inkster . COPYRIGHT AND LICENCE This software is copyright (c) 2014 by Toby Inkster. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. DISCLAIMER OF WARRANTIES THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.