FazBrowse GitHub Viewer
|
Trending
|
URL:
|
Home
Tools:
[Download Repo ZIP]
[View Raw Code]
[Original HTTPS Page]
Java/ciphers/ColumnarTranspositionCipher.java at master · faLekGG/Java · GitHub
faLekGG
/
Java
Public
forked from
TheAlgorithms/Java
Notifications
You must be signed in to change notification settings
Fork
0
Star
0
Code
Pull requests
0
Actions
Projects
Wiki
Security and quality
0
Insights
Additional navigation options
Code
Pull requests
Actions
Projects
Wiki
Security and quality
Insights
Expand file tree
Breadcrumbs
Java
/
ciphers
/
ColumnarTranspositionCipher.java
Copy path
More file actions
More file actions
Latest commit
History
History
History
169 lines (168 loc) · 6.78 KB
Breadcrumbs
Java
/
ciphers
/
ColumnarTranspositionCipher.java
Copy path
File metadata and controls
169 lines (168 loc) · 6.78 KB
Raw
Copy raw file
Download raw file
Open symbols panel
Edit and raw actions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/**
* Columnar Transposition Cipher Encryption and Decryption.
* @author <a href="https://github.com/freitzzz">freitzzz</a>
*/
public
class
ColumnarTranspositionCipher
{
private
static
String
keyword
;
private
static
Object
[][]
table
;
private
static
String
abecedarium
;
public
static
final
String
ABECEDARIUM
=
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789,.;:-@"
;
private
static
final
String
ENCRYPTION_FIELD
=
"≈"
;
private
static
final
char
ENCRYPTION_FIELD_CHAR
=
'≈'
;
/**
* Encrypts a certain String with the Columnar Transposition Cipher Rule
* @param word Word being encrypted
* @param keyword String with keyword being used
* @return a String with the word encrypted by the Columnar Transposition Cipher Rule
*/
public
static
String
encrpyter
(
String
word
,
String
keyword
){
ColumnarTranspositionCipher
.
keyword
=
keyword
;
abecedariumBuilder
(
500
);
table
=
tableBuilder
(
word
);
Object
[][]
sortedTable
=
sortTable
(
table
);
String
wordEncrypted
=
""
;
for
(
int
i
=
0
;
i
<
sortedTable
[
0
].
length
;
i
++){
for
(
int
j
=
1
;
j
<
sortedTable
.
length
;
j
++){
wordEncrypted
+=
sortedTable
[
j
][
i
];
}
}
return
wordEncrypted
;
}
/**
* Encrypts a certain String with the Columnar Transposition Cipher Rule
* @param word Word being encrypted
* @param keyword String with keyword being used
* @param abecedarium String with the abecedarium being used. null for default one
* @return a String with the word encrypted by the Columnar Transposition Cipher Rule
*/
public
static
String
encrpyter
(
String
word
,
String
keyword
,
String
abecedarium
){
ColumnarTranspositionCipher
.
keyword
=
keyword
;
if
(
abecedarium
!=
null
){
ColumnarTranspositionCipher
.
abecedarium
=
abecedarium
;
}
else
{
ColumnarTranspositionCipher
.
abecedarium
=
ABECEDARIUM
;
}
table
=
tableBuilder
(
word
);
Object
[][]
sortedTable
=
sortTable
(
table
);
String
wordEncrypted
=
""
;
for
(
int
i
=
0
;
i
<
sortedTable
[
0
].
length
;
i
++){
for
(
int
j
=
1
;
j
<
sortedTable
.
length
;
j
++){
wordEncrypted
+=
sortedTable
[
j
][
i
];
}
}
return
wordEncrypted
;
}
/**
* Decryps a certain encrypted String with the Columnar Transposition Cipher Rule
* @return a String decrypted with the word ecrypted by the Columnar Transpositiion Cipher Rule
*/
public
static
String
decrypter
(){
String
wordDecrypted
=
""
;
for
(
int
i
=
1
;
i
<
table
.
length
;
i
++){
for
(
int
j
=
0
;
j
<
table
[
i
].
length
;
j
++){
wordDecrypted
+=
table
[
i
][
j
];
}
}
return
wordDecrypted
.
replaceAll
(
ENCRYPTION_FIELD
,
""
);
}
/**
* Builds a table with the word to be encrpyted in rows by the Columnar Transposition Cipher Rule
* @return An Object[][] with the word to be encrypted filled in rows and columns
*/
private
static
Object
[][]
tableBuilder
(
String
word
){
Object
[][]
table
=
new
Object
[
rows
(
word
)+
1
][
keyword
.
length
()];
char
[]
wordInChards
=
word
.
toCharArray
();
//Fils in the respective numbers
table
[
0
]=
findElements
();
int
charElement
=
0
;
for
(
int
i
=
1
;
i
<
table
.
length
;
i
++){
for
(
int
j
=
0
;
j
<
table
[
i
].
length
;
j
++){
if
(
charElement
<
wordInChards
.
length
){
table
[
i
][
j
]=(
char
)
wordInChards
[
charElement
];
charElement
++;
}
else
{
table
[
i
][
j
]=
ENCRYPTION_FIELD_CHAR
;
}
}
}
return
table
;
}
/**
* Determines the number of rows the table should have regarding the Columnar Transposition Cipher Rule
* @return an int with the number of rows that the table should have in order to respect the Columnar Transposition Cipher Rule.
*/
private
static
int
rows
(
String
word
){
if
((
double
)
word
.
length
()/
keyword
.
length
()>
word
.
length
()/
keyword
.
length
()){
return
(
word
.
length
()/
keyword
.
length
())+
1
;
}
else
{
return
word
.
length
()/
keyword
.
length
();
}
}
private
static
Object
[]
findElements
(){
Object
[]
charValues
=
new
Object
[
keyword
.
length
()];
for
(
int
i
=
0
;
i
<
charValues
.
length
;
i
++){
for
(
int
j
=
0
;
j
<
abecedarium
.
length
();
j
++){
if
(
keyword
.
charAt
(
i
)==
abecedarium
.
charAt
(
j
))
charValues
[
i
]=
j
;
}
}
return
charValues
;
}
private
static
Object
[][]
sortTable
(
Object
[][]
table
){
Object
[][]
tableSorted
=
new
Object
[
table
.
length
][
table
[
0
].
length
];
for
(
int
i
=
0
;
i
<
tableSorted
.
length
;
i
++){
for
(
int
j
=
0
;
j
<
tableSorted
[
i
].
length
;
j
++){
tableSorted
[
i
][
j
]=
table
[
i
][
j
];
}
}
for
(
int
i
=
0
;
i
<
tableSorted
[
0
].
length
;
i
++){
for
(
int
j
=
i
+
1
;
j
<
tableSorted
[
0
].
length
;
j
++){
if
((
int
)
tableSorted
[
0
][
i
]>(
int
)
table
[
0
][
j
]){
Object
[]
column
=
getColumn
(
tableSorted
,
tableSorted
.
length
,
i
);
switchColumns
(
tableSorted
,
j
,
i
,
column
);
}
}
}
return
tableSorted
;
}
private
static
Object
[]
getColumn
(
Object
[][]
table
,
int
rows
,
int
column
){
Object
[]
columnArray
=
new
Object
[
rows
];
for
(
int
i
=
0
;
i
<
rows
;
i
++){
columnArray
[
i
]=
table
[
i
][
column
];
}
return
columnArray
;
}
private
static
void
switchColumns
(
Object
[][]
table
,
int
firstColumnIndex
,
int
secondColumnIndex
,
Object
[]
columnToSwitch
){
for
(
int
i
=
0
;
i
<
table
.
length
;
i
++){
table
[
i
][
secondColumnIndex
]=
table
[
i
][
firstColumnIndex
];
table
[
i
][
firstColumnIndex
]=
columnToSwitch
[
i
];
}
}
/**
* Creates an abecedarium with a specified ascii inded
* @param value Number of characters being used based on the ASCII Table
*/
private
static
void
abecedariumBuilder
(
int
value
){
abecedarium
=
""
;
for
(
int
i
=
0
;
i
<
value
;
i
++){
abecedarium
+=(
char
)
i
;
}
}
private
static
void
showTable
(){
for
(
int
i
=
0
;
i
<
table
.
length
;
i
++){
for
(
int
j
=
0
;
j
<
table
[
i
].
length
;
j
++){
System
.
out
.
print
(
table
[
i
][
j
]+
" "
);
}
System
.
out
.
println
();
}
}
public
static
void
main
(
String
[]
args
){
String
keywordForExample
=
"asd215"
;
String
wordBeingEncrypted
=
"This is a test of the Columnar Transposition Cipher"
;
System
.
out
.
println
(
"### Example of Columnar Transposition Cipher ###
\n
"
);
System
.
out
.
println
(
"Word being encryped ->>> "
+
wordBeingEncrypted
);
System
.
out
.
println
(
"Word encrypted ->>> "
+
ColumnarTranspositionCipher
.
encrpyter
(
wordBeingEncrypted
,
keywordForExample
));
System
.
out
.
println
(
"Word decryped ->>> "
+
ColumnarTranspositionCipher
.
decrypter
());
System
.
out
.
println
(
"
\n
### Encrypted Table ###"
);
showTable
();
}
}
Back
|
FazBrowse Home
|
New Git URL