Inheritance diagram for SteganographiaIncantationAnalyzer:

Collaboration diagram for SteganographiaIncantationAnalyzer:

Detailed Description

Class to analyse ciphers based on the steganographic method Trithemius described for the incanations in Steganographia I & II

Author:: jhermes

Public Types
enum	DecipherMethod { PLAYFAIR = ("de.uni_koeln.spinfo.cryptology.cryptanalysis.plaintextgenerators.PlayfairCipherAnalyzer"), POLYBUS = ("de.uni_koeln.spinfo.cryptology.cryptanalysis.plaintextgenerators.PolybusCipherAnalyzer"), CAESAR = ("de.uni_koeln.spinfo.cryptology.cryptanalysis.plaintextgenerators.CaesarCipherAnalyzer"), VIGNERE = ("de.uni_koeln.spinfo.cryptology.cryptanalysis.plaintextgenerators.VignereCipherAnalyzer"), ATBASH = ("de.uni_koeln.spinfo.cryptology.cryptanalysis.plaintextgenerators.AtbashCipherAnalyzer"), STEGANOGRAPHIA_I = ("SteganographiaICipherAnalyzer"), STEGANOGRAPHIA_INCANTATION = ("de.uni_koeln.spinfo.cryptology.steganalysis.plaintextgenerators.SteganographiaIncantationAnalyzer"), POLYGRAPHIA_I = ("de.uni_koeln.spinfo.cryptology.steganalysis.plaintextgenerators.PolygraphiaICipherAnalyzer"), POLYGRAPHIA_IV = ("de.uni_koeln.spinfo.cryptology.steganalysis.plaintextgenerators.PolygraphiaIVCipherAnalyzer"), POLYGRAPHIA_V = ("de.uni_koeln.spinfo.cryptology.cryptanalysis.plaintextgenerators.PolygraphiaVCipherGenerator") }
enum	ConfigurationElement { KEY = ("Key"), ALPHABET = ("Alphabet"), REPLACEMENTS = ("Replacements"), WORD_SUBSTITUTES = ("Substitutes"), DELETE_WHITESPACE = ("Whitespace deletion") }
Public Methods
String	decipher (String cipherText)
String	decipher (List< String > words)
void	configure (Map< ConfigurationElement, String > configurations)
String	getAssembledString ()
Set< Character >	getAlphabet ()
void	setAlphabet (char[] alphabet)
String	replaceAll (String toProcess)
Map< String, String >	getReplacements ()
Map< String, String >	getReplacements ()
Set< Character >	getAlphabet ()
Public Static Methods
static String	assembleSignificantLetters (List< String > words, int pos)
static String	assembleSignificantLetters (List< String > words, List< Integer > positions)
static String	getPlaintextFromTrithemianIncantation (List< String > words)
static String	getPlaintextFromTrithemianSteganographianCipher (List< String > words, boolean[] significantSequence)
static char[]	getDefaultAlphabet ()
static char[]	getDefaultAlphabetWithoutChar (char ch)
static char[]	getTrithemianAlphabet ()
static Map< String, String >	trithemianAlphabetReplacements ()
Protected Methods
boolean	checkSubstitutes (String substitutesString)
boolean	checkAlphabet (String alphabetString, char[] defaultAlphabet)
boolean	checkReplacements (String replacementString)
void	checkWSDeletion (String deleteWhitespace)
boolean	checkIntKey (String intKeyString, int defaultKey)
String	getAlphabetAsStringKey (int start)
Protected Attributes
Map< Character, List< String > >	wordSubstitutions
char[]	alphabet
Map< String, String >	replacementMap
int	intKey
boolean	deleteWhitespace
Logger	logger = Logger.getLogger(this.getClass())

Member Enumeration Documentation

enum ConfigurationElement [inherited]

Enumeration of potential configuration elements for Cryptologers.

Author:: jhermes

Enumerator:

KEY
ALPHABET
REPLACEMENTS
WORD_SUBSTITUTES
DELETE_WHITESPACE

enum DecipherMethod [inherited]

Enumeration of decipher methods.

Author:: jhermes

Enumerator:

PLAYFAIR
POLYBUS
CAESAR
VIGNERE
ATBASH
STEGANOGRAPHIA_I
STEGANOGRAPHIA_INCANTATION
POLYGRAPHIA_I
POLYGRAPHIA_IV
POLYGRAPHIA_V

Method Details

static String assembleSignificantLetters	(	List< String >	words,
		int	pos
	)		`[static, inherited]`

Static method to assemble significant letters of the specified word List on a String. If the specified position lies outside a word, it will be ignored.

Parameters:

words	words with significant letters.
pos	position of significant letter of each word. Positive ints will be interpreted as position from start, negative from end of each word.

Returns:: String of assembled significant letters

static String assembleSignificantLetters	(	List< String >	words,
		List< Integer >	positions
	)		`[static, inherited]`

Static method to assemble significant letters of the specified word List on a String. Letters will be assembled in order of the specified positions. Positive position Integers will be interpreted as position from start, negative as positions from end of each word. Example: If the Integer List contains {3,-1,4} the significant letter order of the word "trithemius" will be "ist". If one of the specified positions lies outside a word, it will be ignored.

Parameters:

words	words with significant letters.
positions	of significant letters of each word.

Returns:: String of assembled significant letters

boolean checkAlphabet	(	String	alphabetString,
		char[]	defaultAlphabet
	)		`[protected, inherited]`

Builds alphabet from specified string, if not null and not empty. Else the specified default alphabet will be set as alphabet.

Parameters:

alphabetString	String to set as alphabet.
defaultAlphabet	default alphabet.

Returns:: true, if alphabetString can be set as alphabet, false if default alphabet is set.

boolean checkIntKey	(	String	intKeyString,
		int	defaultKey
	)		`[protected, inherited]`

Builds an integer key from the specified string.

Parameters:

intKeyString	integer key as string
defaultKey	key to set if integer key could not be build from specified string.

Returns:: true, if int key is builded from specified string, false otherwise.

boolean checkReplacements ( String replacementString ) [protected, inherited]

Builds replacement map from specified string that should be parsable CSV data.

Parameters:

replacementString replacements as csv data.

Returns:: true, if replacement map could be build, false otherwise.

boolean checkSubstitutes ( String substitutesString ) [protected, inherited]

Builds the word substitution map using specified string. String must contain parsable csv data.

Parameters:

substitutesString csv substitute data

Returns:: true, if word substitution map have been build, false otherwise.

Reimplemented in PolygraphiaICipherAnalyzer.

void checkWSDeletion ( String deleteWhitespace ) [protected, inherited]

If specified string equals true, whitespace will be deleted in the substituted text.

Parameters:

deleteWhitespace boolean value as string

void configure ( Map< ConfigurationElement, String > configurations )

Configures the Cryptologer with the specified ConfigurationElement - String value pairs.

Parameters:

configurations Map of ConfigurationElement - String value pairs

Implements Cryptologer.

String decipher ( List< String > words )

Returns the plain text of the specified cipher word sequence.

Parameters:

words Sequence of words to decipher.

Returns:: plain text.

Implements Decipherer.

String decipher ( String cipherText )

Deciphers the specified text.

Parameters:

cipherText text to decipher.

Returns:: deciphered text.

Implements Decipherer.

Set<Character> getAlphabet ( ) [inherited]

Returns the alphabet of this crypto component.

Returns:: alphabet of this crypto component.

Set<Character> getAlphabet ( ) [inherited]

Returns a set of the alphabet of replacement characters

Returns:

String getAlphabetAsStringKey ( int start ) [protected, inherited]

Returns the alphabet as string key (starts from the specified position, e.g. 1 for a).

Parameters:

start Position of the alphabet to start.

Returns:: alphabet as string key.

String getAssembledString ( ) [inherited]

Assembles the significant letters of the specified word.

Parameters:

word	to assemble. Returns the assembled plaintext String.

Returns:: assembled plaintext String.

static char [] getDefaultAlphabet ( ) [static, inherited]

Returns the default alphabet (a-z), lower case letters.

Returns:: default alphabet (a-z).

static char [] getDefaultAlphabetWithoutChar ( char ch ) [static, inherited]

Returns the default alphabet (a-z) without the specified character. Needed e.g. to get 25 letters for a 5 * 5 matrix.

Parameters:

ch	character to ignore.

Returns:: default alphabet without the specified character.

static String getPlaintextFromTrithemianIncantation ( List< String > words ) [static, inherited]

Static method to get the plaintext from a Trithemian incantation of Steganographia I & II.

Parameters:

words words of an incantation

Returns:: plaintext from the specified incantation.

static String getPlaintextFromTrithemianSteganographianCipher	(	List< String >	words,
		boolean[]	significantSequence
	)		`[static, inherited]`

Static method to get the plaintext from a Trithemian cipher of Steganographia I & II. Eg. if significantSequence is [true, true, false, false] after two significant words will be deleted two words, if "One Two Three Four Five Six Seven" is the input, "One Two Five Six" will be analyzed, the returned String will be "otfs".

Parameters:

words	words of the cipher
significantSequence	sequence of significant initial letters

Returns:: plaintext of the specified cipher

Map<String, String> getReplacements ( ) [inherited]

Returns a map of the replacements that were used by the component

Returns:: map of replacements

Map<String, String> getReplacements ( ) [inherited]

static char [] getTrithemianAlphabet ( ) [static, inherited]

Returns the Trithemian alphabet: abcdefghiklmnopqrstuxyzw.

Returns:: Trithemian alphabet.

String replaceAll ( String toProcess ) [inherited]

Replaces characters of the specified string by the replacements set in this.

Parameters:

toProcess String to process.

Returns:: String with replaced characters.

void setAlphabet ( char[] alphabet ) [inherited]

Sets the alphabet of this crypto component.

Parameters:

alphabet to set.

static Map<String,String> trithemianAlphabetReplacements ( ) [static, inherited]

Returns a map of default alphabet values and their replacements in the T. alphabet.

Returns:: Tritemian replacement map.

Field Details

char [] alphabet [protected, inherited]

boolean deleteWhitespace [protected, inherited]

int intKey [protected, inherited]

Logger logger = Logger.getLogger(this.getClass()) [protected, inherited]

Map<String,String> replacementMap [protected, inherited]

Map<Character, List<String> > wordSubstitutions [protected, inherited]

SteganographiaIncantationAnalyzer Class Reference

Detailed Description

Public Types

Public Methods

Public Static Methods

Protected Methods

Protected Attributes

Member Enumeration Documentation

Method Details

Field Details