hcrypto.engines
Class SubstitutionKey

java.lang.Object
  |
  +--hcrypto.cipher.HistoricalKey
        |
        +--hcrypto.engines.SubstitutionKey

public class SubstitutionKey

extends HistoricalKey

This class represents a key for a Simple Substitution cipher. The key is entirely represented by a keyword, which which is inserted at the beginning of a SubstitutionAlphabet. For example, the keyword "ralph" would begin the substitution alphabet and the remaining letters would would follow in their natural progression: "ralphbcdefgijkmnoqstuvwxyz".

For this implementation of Substitution cipher any of the alphabet ranges can be used.

See also:

SubstitutionCipherSpi
Alphabet

Field Summary

static java.lang.String	DEFAULT_KEY_DESCRIPTOR_PROMPT_STRING A keyword description.
static java.lang.String	DEFAULT_KEYWORD_STRING A default keyword.

Fields inherited from class hcrypto.cipher.HistoricalKey

alphabet, blocksize, keyDescriptorPrompt, keyspec, keyword

Constructor Summary

SubstitutionKey()

Method Summary

java.lang.String	getAlgorithm() Returns the algorithm name "Substitution".
char[]	getCipherAlphabet() Returns the cipher alphabet.
char[]	getPlainAlphabet() Returns the plaintext alphabet.
void	init(java.lang.String keyspec) Creates a SubstitutionKey with the specified keyspec.
void	printAlphabets() Prints both the cipher and plain alphabets to the System console.

Methods inherited from class hcrypto.cipher.HistoricalKey

getAlphabet, getBlocksize, getInstance, getKeyDescriptorPrompt, getKeyword, initKey, removeDuplicateChars

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_KEY_DESCRIPTOR_PROMPT_STRING

public static final java.lang.String DEFAULT_KEY_DESCRIPTOR_PROMPT_STRING

A keyword description.

DEFAULT_KEYWORD_STRING

public static final java.lang.String DEFAULT_KEYWORD_STRING

A default keyword.

Constructor Detail

SubstitutionKey

public SubstitutionKey()

Method Detail

init

public void init(java.lang.String keyspec)
          throws java.lang.Exception

Creates a SubstitutionKey with the specified keyspec.

Overrides:

init in class HistoricalKey

Parameters:

keySpec - takes the form "keyword/alphabet", i.e. "76TrombonesLEDTHEBIGPARADE/azAZ09" for example, which would be mapped into the instance variables keyword as a String with the value of "76TrombonesLEDTHEBIGPARADE", and alphabet as a String with the value "azAZ09".

getAlgorithm

public java.lang.String getAlgorithm()

Returns the algorithm name "Substitution".

Overrides:

getAlgorithm in class HistoricalKey

getCipherAlphabet

public char[] getCipherAlphabet()

Returns the cipher alphabet.

getPlainAlphabet

public char[] getPlainAlphabet()

Returns the plaintext alphabet.

printAlphabets

public void printAlphabets()

Prints both the cipher and plain alphabets to the System console.