Bifid cipher: Difference between revisions
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(_81{.123{.a.)difib(_81{.123{.a.)bifid 'The invasion will start on the first of January'
TheinvasionwillstartonthefirstofJanuary</syntaxhighlight>
=={{header|Java}}==
<syntaxhighlight lang="java">
import java.awt.Point;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public final class BifidCipher {
public static void main(String[] aArgs) {
final String message1 = "ATTACKATDAWN";
final String message2 = "FLEEATONCE";
final String message3 = "The invasion will start on the first of January".toUpperCase().replace(" ", "");
Bifid bifid1 = new Bifid(5, "ABCDEFGHIKLMNOPQRSTUVWXYZ");
Bifid bifid2 = new Bifid(5, "BGWKZQPNDSIOAXEFCLUMTHYVR");
runTest(bifid1, message1);
runTest(bifid2, message2);
runTest(bifid2, message1);
runTest(bifid1, message2);
Bifid bifid3 = new Bifid(6, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789");
runTest(bifid3, message3);
}
private static void runTest(Bifid aBifid, String aMessage) {
System.out.println("Using Polybius square:");
aBifid.display();
System.out.println("Message: " + aMessage);
String encrypted = aBifid.encrypt(aMessage);
System.out.println("Encrypted: " + encrypted);
String decrypted = aBifid.decrypt(encrypted);
System.out.println("Decrypted: " + decrypted);
System.out.println();
}
}
final class Bifid {
public Bifid(int aN, String aText) {
if ( aText.length() != aN * aN ) {
throw new IllegalArgumentException("Incorrect length of text");
}
grid = new char[aN][aN];
int row = 0;
int col = 0;
for ( char ch : aText.toCharArray() ) {
grid[row][col] = ch;
coordinates.put(ch, new Point(row, col) );
col += 1;
if ( col == aN ) {
col = 0;
row += 1;
}
}
if ( aN == 5 ) {
coordinates.put('J', coordinates.get('I'));
}
}
public void display() {
Arrays.stream(grid).forEach( row -> System.out.println(Arrays.toString(row)) );
}
public String encrypt(String aText) {
List<Integer> rowOne = new ArrayList<Integer>();
List<Integer> rowTwo = new ArrayList<Integer>();
for ( char ch : aText.toCharArray() ) {
Point coordinate = coordinates.get(ch);
rowOne.add(coordinate.x);
rowTwo.add(coordinate.y);
}
rowOne.addAll(rowTwo);
StringBuilder result = new StringBuilder();
for ( int i = 0; i < rowOne.size() - 1; i += 2 ) {
result.append(grid[rowOne.get(i)][rowOne.get(i + 1)]);
}
return result.toString();
}
public String decrypt(String aText) {
List<Integer> row = new ArrayList<Integer>();
for ( char ch : aText.toCharArray() ) {
Point coordinate = coordinates.get(ch);
row.add(coordinate.x);
row.add(coordinate.y);
}
final int middle = row.size() / 2;
List<Integer> rowOne = row.subList(0, middle);
List<Integer> rowTwo = row.subList(middle, row.size());
StringBuilder result = new StringBuilder();
for ( int i = 0; i < middle; i++ ) {
result.append(grid[rowOne.get(i)][rowTwo.get(i)]);
}
return result.toString();
}
private char[][] grid;
private Map<Character, Point> coordinates = new HashMap<Character, Point>();
}
</syntaxhighlight>
{{ out }}
<pre>
Using Polybius square:
[A, B, C, D, E]
[F, G, H, I, K]
[L, M, N, O, P]
[Q, R, S, T, U]
[V, W, X, Y, Z]
Message: ATTACKATDAWN
Encrypted: DQBDAXDQPDQH
Decrypted: ATTACKATDAWN
Using Polybius square:
[B, G, W, K, Z]
[Q, P, N, D, S]
[I, O, A, X, E]
[F, C, L, U, M]
[T, H, Y, V, R]
Message: FLEEATONCE
Encrypted: UAEOLWRINS
Decrypted: FLEEATONCE
Using Polybius square:
[B, G, W, K, Z]
[Q, P, N, D, S]
[I, O, A, X, E]
[F, C, L, U, M]
[T, H, Y, V, R]
Message: ATTACKATDAWN
Encrypted: EYFENGIWDILA
Decrypted: ATTACKATDAWN
Using Polybius square:
[A, B, C, D, E]
[F, G, H, I, K]
[L, M, N, O, P]
[Q, R, S, T, U]
[V, W, X, Y, Z]
Message: FLEEATONCE
Encrypted: HADNAAZDSP
Decrypted: FLEEATONCE
Using Polybius square:
[A, B, C, D, E, F]
[G, H, I, J, K, L]
[M, N, O, P, Q, R]
[S, T, U, V, W, X]
[Y, Z, 0, 1, 2, 3]
[4, 5, 6, 7, 8, 9]
Message: THEINVASIONWILLSTARTONTHEFIRSTOFJANUARY
Encrypted: TBPDIPHJSPOTAIVMGPCZKNSCN09BFIHK64I7BM4
Decrypted: THEINVASIONWILLSTARTONTHEFIRSTOFJANUARY
</pre>
=={{header|Julia}}==
Using the Raku example's test messages.
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