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DSA-PS-Java-Programs/ColumnarTranspositionCipher.java at master · codec-akash/DSA-PS-Java-Programs · GitHub
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ColumnarTranspositionCipher.java
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ColumnarTranspositionCipher.java
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import
java
.
io
.*;
class
Columnar
{
char
arr
[][],
encrypt
[][],
decrypt
[][],
keya
[],
keytemp
[];
void
createMatrixEncrypt
(
String
s
,
String
key
,
int
row
,
int
column
) {
arr
=
new
char
[
row
][
column
];
int
k
=
0
;
keya
=
key
.
toCharArray
();
for
(
int
i
=
0
;
i
<
row
;
i
++) {
for
(
int
j
=
0
;
j
<
column
;
j
++) {
if
(
k
<
s
.
length
()) {
arr
[
i
][
j
] =
s
.
charAt
(
k
);
k
++;
}
else
{
arr
[
i
][
j
] =
' '
;
}
}
}
}
void
createkey
(
String
key
,
int
column
) {
keytemp
=
key
.
toCharArray
();
for
(
int
i
=
0
;
i
<
column
-
1
;
i
++) {
for
(
int
j
=
i
+
1
;
j
<
column
;
j
++) {
if
(
keytemp
[
i
] >
keytemp
[
j
]) {
char
temp
=
keytemp
[
i
];
keytemp
[
i
] =
keytemp
[
j
];
keytemp
[
j
] =
temp
;
}
}
}
}
void
createMatrixDecrypt
(
String
s
,
String
key
,
int
row
,
int
column
) {
arr
=
new
char
[
row
][
column
];
int
k
=
0
;
keya
=
key
.
toCharArray
();
for
(
int
i
=
0
;
i
<
column
;
i
++) {
for
(
int
j
=
0
;
j
<
row
;
j
++) {
if
(
k
<
s
.
length
()) {
arr
[
j
][
i
] =
s
.
charAt
(
k
);
k
++;
}
else
{
arr
[
j
][
i
] =
' '
;
}
}
}
}
void
encrypt
(
int
row
,
int
column
) {
encrypt
=
new
char
[
row
][
column
];
for
(
int
i
=
0
;
i
<
column
;
i
++) {
for
(
int
j
=
0
;
j
<
column
;
j
++) {
if
(
keya
[
i
] ==
keytemp
[
j
]) {
for
(
int
k
=
0
;
k
<
row
;
k
++) {
encrypt
[
k
][
j
] =
arr
[
k
][
i
];
}
keytemp
[
j
] =
'?'
;
break
;
}
}
}
}
void
decrypt
(
int
row
,
int
column
) {
decrypt
=
new
char
[
row
][
column
];
for
(
int
i
=
0
;
i
<
column
;
i
++) {
for
(
int
j
=
0
;
j
<
column
;
j
++) {
if
(
keya
[
j
] ==
keytemp
[
i
]) {
for
(
int
k
=
0
;
k
<
row
;
k
++) {
decrypt
[
k
][
j
] =
arr
[
k
][
i
];
}
keya
[
j
] =
'?'
;
break
;
}
}
}
}
void
resultEncrypt
(
int
row
,
int
column
,
char
arr
[][]) {
System
.
out
.
println
(
"Result:"
);
for
(
int
i
=
0
;
i
<
column
;
i
++) {
for
(
int
j
=
0
;
j
<
row
;
j
++) {
System
.
out
.
print
(
arr
[
j
][
i
]);
}
}
}
void
resultDecrypt
(
int
row
,
int
column
,
char
arr
[][]) {
System
.
out
.
println
(
"Result:"
);
for
(
int
i
=
0
;
i
<
row
;
i
++) {
for
(
int
j
=
0
;
j
<
column
;
j
++) {
System
.
out
.
print
(
arr
[
i
][
j
]);
}
}
}
public
static
void
main
(
String
args
[])
throws
IOException
{
int
row
,
column
,
choice
;
Columnar
obj
=
new
Columnar
();
BufferedReader
in
=
new
BufferedReader
(
new
InputStreamReader
(
System
.
in
));
System
.
out
.
println
(
"Menu:
\n
1) Encryption
\n
2) Decryption"
);
choice
=
Integer
.
parseInt
(
in
.
readLine
());
System
.
out
.
println
(
"Enter the string:"
);
String
s
=
in
.
readLine
();
System
.
out
.
println
(
"Enter the key:"
);
String
key
=
in
.
readLine
();
row
=
s
.
length
() /
key
.
length
();
if
(
s
.
length
() %
key
.
length
() !=
0
)
row
++;
column
=
key
.
length
();
if
(
choice
==
1
) {
obj
.
createMatrixEncrypt
(
s
,
key
,
row
,
column
);
obj
.
createkey
(
key
,
column
);
obj
.
encrypt
(
row
,
column
);
obj
.
resultEncrypt
(
row
,
column
,
obj
.
encrypt
);
}
else
{
obj
.
createMatrixDecrypt
(
s
,
key
,
row
,
column
);
obj
.
createkey
(
key
,
column
);
obj
.
decrypt
(
row
,
column
);
obj
.
resultDecrypt
(
row
,
column
,
obj
.
decrypt
);
}
}
}
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