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One Time Pad Chiper bisa dibilang mirip dengan Vigenere Chiper. Chiper jenis ini bisa dibilang mustahil untuk dipecahkan bila tidak tahu kuncinya, karena nya sering disebut perfect chiper. Major Yoseph Mouborgne dan Gilbert Vernam menemukannya pada 1917 di perang dunia kedua. One Time Pad Chiper dikalim sebagai algoritma kriptografi paling sempurna, algoritma aman jika tidak diketaui plaintext-nya. meskipun teknologi kini telah mutakhir, belum ada yang bisa menemukan decryptor/encryptor nya. sering digunakan oleh sistem keamanan AS karena kesulitannya untuk dipecahkan.

Contoh:
Chess = Plain Text
Catur = One Time Pad/Kata Kunci
Rumus (Plain Text + One Time Pad) - 1 = Chiper Text
(Note; Huruf dijadikan angka urutan pada alfabet (ex; A=1, Z=26))
Huruf pertama pada Plain Text = C
Huruf pertama pada katakunci = C
C merupakan urutan ke 3 pada alfabet
Masukkan kedalam rumus;
(3+3)-1=5
Urutan kelima pada alfabet adalah E. Maka huruf pertama dri chiper text ini adalah E.
Sehingga chiper text-nya menjadi EHMXJ.
Jika lebih dari 26, maka jumlah pertambahan Plain Text dan Kata Kunci dikurangi 26, setelahnya tetap dikurang satu.
Jumlah huruf kata kunci tidak harus sama dengan plain text. Jika kata kunci kurang, bisa diulang dri awal.
ex;
Plain Text = Raleigh
Kata Kunci = Ryu
jadi;
-RALEIGH
-RYURYUR (jumlah huruf sama)
Jika kata kunci lebih banyak dripada plaintext, ambil secukupnya saja.

by @aquilacst B1923
     
 
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