hcrypto.engines
Class RailfenceKey

java.lang.Object
  hcrypto.cipher.HistoricalKey
      hcrypto.engines.RailfenceKey

public class RailfenceKey
extends HistoricalKey

Implements the Railfence Key The keyspec, described in TestCipher.java is passed to this file where the blocksize, key and alphabet range is extracted. The key determines the encryption of the cipher The blockszie determines how many characters are encrypted at one time.

Field Summary

static java.lang.String	DEFAULT_KEY_DESCRIPTOR_PROMPT_STRING A description for a RailFence Key.
static java.lang.String	DEFAULT_KEYWORD_STRING A default key value.

Constructor Summary

RailfenceKey()

Method Summary

java.lang.String	getAlgorithm() Returns the name of the algorithm "RailFence".
void	init(java.lang.String keyspec) Creates a RailFenceKey with the specified keyspec.
void	init(java.lang.String keyword, Alphabet alpha1, Alphabet alpha2) Initializes the RailfenceKey given a keyword and one or more alphabets.

Methods inherited from class hcrypto.cipher.HistoricalKey

getAlphabet, getBlocksize, getCipherKey, getCTAlphabet, getInstance, getKeyDescriptorPrompt, getKeyword, getPlainKey, initKey, initKey, invertKey, printAlphabets, removeDuplicateChars

Methods inherited from class java.lang.Object

equals, 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 description for a RailFence Key.

See Also:

Constant Field Values

DEFAULT_KEYWORD_STRING

public static final java.lang.String DEFAULT_KEYWORD_STRING

A default key value.

See Also:

Constant Field Values

Constructor Detail

RailfenceKey

public RailfenceKey()

Method Detail

init

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

Creates a RailFenceKey with the specified keyspec.

Specified by:

init in class HistoricalKey

Parameters:

keySpec - takes the form "keyword/alphabet", i.e. "5/az+AZ" for example, which would be mapped into the instance keyword = 5 and sets the alphabet as a String with the value "az+AZ".

Throws:

java.lang.Exception

init

public void init(java.lang.String keyword,
                 Alphabet alpha1,
                 Alphabet alpha2)
          throws java.lang.Exception

Initializes the RailfenceKey given a keyword and one or more alphabets.

Specified by:

init in class HistoricalKey

Parameters:

keyword - -- a string version of the keyword

alpha1, - alpha2 -- Alphabets for plain/ciphertext respectively. May be identical.

Throws:

java.lang.Exception

getAlgorithm

public java.lang.String getAlgorithm()

Returns the name of the algorithm "RailFence".

Specified by:

getAlgorithm in class HistoricalKey