hcrypto.engines
Class TranspositionKey

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

public class TranspositionKey

extends HistoricalKey

This class represents a key for a Transposition cipher. The key is entirely represented by a keyword, a String with a set of positive contiguous integers always including zero: such as "2013".

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

See also:

TranspositionKey
Alphabet

Field Summary

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

Fields inherited from class hcrypto.cipher.HistoricalKey

alphabet, blocksize, ciphAlphabet, cipherAlphabet, keyDescriptorPrompt, keyspec, keyword, plainAlphabet

Constructor Summary

TranspositionKey()

Method Summary

java.lang.String	getAlgorithm() Returns the name of the algorithm "Transposition".
java.lang.String	getInvertedKeyword() Returns the inverted keyword.
void	init(java.lang.String keyspec) Initializes the TranspositionKey with the specified keyspec.

Methods inherited from class hcrypto.cipher.HistoricalKey

getAlphabet, getBlocksize, getCiphAlphabet, getCTAlphabet, getInstance, getKeyDescriptorPrompt, getKeyword, getPlainAlphabet, initAlphabets, initKey, printAlphabets, 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 key.

Constructor Detail

TranspositionKey

public TranspositionKey()

Method Detail

init

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

Initializes the TranspositionKey with the specified keyspec.

Overrides:

init in class HistoricalKey

Parameters:

keySpec - takes the form "keyword/alphabet", i.e. "2013/azAZ09" for example, which would be mapped into the instance variables keyword as a String with the value of "2013", and alphabet as a String with the value "azAZ09".

getAlgorithm

public java.lang.String getAlgorithm()

Returns the name of the algorithm "Transposition".

Overrides:

getAlgorithm in class HistoricalKey

getInvertedKeyword

public java.lang.String getInvertedKeyword()

Returns the inverted keyword.