NAME
Crypt::Role::CheckerboardCipher - guts of the Polybius square cipher implementation
DESCRIPTION
Attributes
The following attributes exist. All of them have defaults, and should not be provided to the constructors of consuming classes.
square-
An arrayref of arrayrefs of letters.
square_size-
The length of one side of the square, as an integer.
encipher_hash-
Hashref used by the
enciphermethod. decipher_hash-
Hashref used by the
deciphermethod.
Object Methods
encipher($str)-
Enciphers a string and returns the ciphertext.
decipher($str)-
Deciphers a string and returns the plaintext.
_build_square_size-
Calculates the optimum square size for the alphabet. An alphabet of 25 letters can fill a five by five square, so this method would return 5. An alphabet of 26 characters would partly fill a six by six square, so this method would return 6.
This method is not expected to be called by end-users but is documented for people writing classes consuming this role.
_build_square-
Allocates the letters of the alphabet into a square (an arrayref of arrayrefs of letters), returning the square.
This method is not expected to be called by end-users but is documented for people writing classes consuming this role.
Required Methods
Classes consuming this role must provide the following methods:
preprocess($str)-
Expected to return a string more suitable for enciphering.
alphabet-
Expected to returns an arrayref of the known alphabet.
BUGS
Please report any bugs to http://rt.cpan.org/Dist/Display.html?Queue=Crypt-Polybius.
SEE ALSO
http://en.wikipedia.org/wiki/Polybius_square.
Crypt::Polybius, Crypt::Polybius::Greek.
AUTHOR
Toby Inkster <tobyink@cpan.org>.
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.