Qwerty Algorithm Tutorial

Java programming science is very broad and can be implemented in various fields. Among them are cryptographic. Cryptography itself is one branch of computer science in the world, which is associated with encoding or disguise the original text (plain text) into text that is disguised so as not to be understood by readers (chiper text).

Here is one example of the science of cryptographic algorithms called Qwerty (originaled by: Dwindy Stanza & Paiman). As the name implies, QWERTY, this algorithm adapted to the standard keyboard board. The principle works something like this:

A : index 0 = Q : index 0
B : index 1 = W : index 1
C : index 2 = E : index 2
D : index 3 = R : index 3
...
Z : index 25 = M : index 25

That's for the first letter, while for the second letter there is a shift in the index, so that A is no longer the Q, but the W. And Q was changed to the last index that W to M shifted one index. And so on.

A : index 0 = W : index 0
B : index 1 = E : index 1
C : index 2 = R : index 2
D : index 3 = T : index 3
...
Z : index 25 = Q : index 25

Prior to implementation of the program code, first create the components needed, ie
1. JPanel txtPlain
2. JPanel txtChiper
3. JButton btnEncrypt
4. JButton btnDecrypt

Encrypt used to translate the text into chiper Plain text, while Decrypt chiper translate text into plain text.

For implementation in java, something like this for action btnEncrypt:

private void btnEncryptActionPerformed(java.awt.event.ActionEvent evt) {
char [] kode = {'Q','W','E','R','T','Y','U','I','O','P','A','S','D','F','G','H','J','K','L','Z','X','C','V','B','N','M' };
char [] abc = {'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' };

int ketemu=0;
char tampung = 0;
String plaintext = txtPlain.getText();
char[] ciphertext = new char[plaintext.length()];

if (!plaintext.equals(""))
txtPlain.setText(plaintext);

for(int w = 0; w
tampung = plaintext.toUpperCase().charAt(w) ;
for(int x = 0 ; x<=25 ; x++){
if(tampung == abc[x] ){
ketemu = x;
}
// else{ ketemu = -1; }
ciphertext[w] = kode[ketemu];
}

char bantu = 0;

bantu = kode[0];
// Pergeseran Index
for(int i = 0 ; i<=24 ; i++ ) {
kode[i] = kode[i+1];
}
kode[25] = bantu;
}
String c;
for(int w = 0; w txtCipher.setText(String.valueOf(ciphertext));
}

}

As for the implementation of the action button Decrypt are as follows:

private void btnDecryptActionPerformed(java.awt.event.ActionEvent evt) {
char [] kode = {'Q','W','E','R','T','Y','U','I','O','P','A','S','D','F','G','H','J','K','L','Z','X','C','V','B','N','M' };
char [] abc = {'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' };

int ketemu=0;
char tampung = 0;
String plaintext = txtPlain.getText();
char[] ciphertext = new char[plaintext.length()];

if (!plaintext.equals(""))
txtPlain.setText(plaintext);

for(int w = 0; w
tampung = plaintext.toUpperCase().charAt(w) ;
for(int x = 0 ; x<=25 ; x++){
if(tampung == kode[x] ){
ketemu = x;
}
// else{ ketemu = -1; }
ciphertext[w] = abc[ketemu];
}

char bantu = 0;

bantu = abc[25];
// Pergeseran Index
for(int i = 25 ; i>=1 ; i-- ) {
abc[i] = abc[i-1];
}
abc[0] = bantu;
}
String c;
for(int w = 0; w txtCipher.setText(String.valueOf(ciphertext));
}

}

For the result, here is an example :
plain text = BEDA
chiper text = WYYR

keep trying and happy coding !

By : Mr.Stanza