Do You Have Problem with Your Message Privacy?
If Your Answer is 'Yes', You May Try This Method
Firstly, you have to make a table like this,
And Then, Choose your real text, in this session it calls 'Plain Text',
Example : 'BAYU BUDHI BASKORO' but you should avoid the space, so the text will be like this
'BAYUBUDHIBASKORO'
Now, you have to make your key, the key is a matrix (2 x 2), for example :
And then, you should separate your Plain Text to the two words form, and then change your Plain Text to the number form such a rules like table above, for example :
'BAYUBUDHIBASKORO' --> BA, YU, BU, DH, IB, AS, KO, RO --> (1,0); (24,20); (1,20); (3,7); (8,1); (0,18); (10,14); (17,14)
But, if your plain text less by one letter, you can add your plain text by space character '_', for example :
'UDINSEDUNIA' --> UD, IN, SE, DU, NI, A_
And then you should calculate the matrix by multiply that matrix with two number that have changed, like tabel below :
And then, continue till you finish your encription
So you will have been a result like this : 'GGOFVMQX.__R.MLZ'
Have a nice try ^-^
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