hcrypto.analyzer
Class CryptogramAnalyzer

java.lang.Object
  |
  +--hcrypto.analyzer.CryptogramAnalyzer

All Implemented Interfaces:

Analyzer

public class CryptogramAnalyzer

extends java.lang.Object

implements Analyzer

Fields inherited from interface hcrypto.analyzer.Analyzer

DECIPHER_LIMIT

Constructor Summary

CryptogramAnalyzer()

CryptogramAnalyzer(TextStatistics ts)
This constructor takes a reference to a TextStatistics object that stores frequency and other data about the text being analyzed.

Method Summary

void	doAnalysis() This method performs an analysis of the text.
java.lang.String	getReport() This method is part of the Analyzer interface.
void	run() This method is part of the Analyzer interface.
void	setup(java.lang.String text) This method initializes the Analyzer.
java.lang.String	toString() This method returns the report generated by the analysis.

Methods inherited from class java.lang.Object

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

Constructor Detail

CryptogramAnalyzer

public CryptogramAnalyzer()

CryptogramAnalyzer

public CryptogramAnalyzer(TextStatistics ts)
                   throws java.lang.NullPointerException

This constructor takes a reference to a TextStatistics object that stores frequency and other data about the text being analyzed. It creates instances of various tools used by the analyzer.

Parameters:

ts - a TextStatistics object

Method Detail

setup

public void setup(java.lang.String text)

This method initializes the Analyzer. The text is broken into tokens that are stored in an array. Each token is associated with a pattern -- 'that' has the pattern '1231'. The tokens are sorted with those having the smallest (non empty) pattern set given preference.

Specified by:

setup in interface Analyzer

Parameters:

text - a String pointing to the text being analyzed

run

public void run()

This method is part of the Analyzer interface. It runs the analysis.

Specified by:

run in interface Analyzer

getReport

public java.lang.String getReport()

This method is part of the Analyzer interface. It returns the report generated by the analysis.

Specified by:

getReport in interface Analyzer

toString

public java.lang.String toString()

This method returns the report generated by the analysis.

Overrides:

toString in class java.lang.Object

doAnalysis

public void doAnalysis()

This method performs an analysis of the text. It assumes the text is a word-delimited cryptogram created using a simple substitution cipher. The anlysis is performed by a recursive backtracking search of the key space.