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MONO AND POLYALPHABETIC CIPHER


MONOALPHABETIC
Misalkan saja a menjadi c, berarti b nya menjadi d, k nya juga berubah menjadi m. Itu bisa diatur tergantung huruf yang dimasukkan.

Pertama, kita masukkan katanya. Contoh: KRIPTO

Lalu,
Kita tuliskan kuncinya (berupa satu huruf saja). Itu yang akan mengganti a menjadi huruf itu. Kalau misalkan kita tulis f, berarti a nya berganti menjadi f, c menjadi h, dsb.

KRIPTO dengan kunci C akan menjadi
MTKRVQ

Kekurangan dari monoalphabetic cipher adalah sandi yang kita tulis akan sangat mudah ditebak. karena kalau misalkan tulisan "baca" dienkripsi dengan kunci "r" akan menjadi "srtr".

Ada yang lebih menarik lagi, yaitu polyalphabetic cipher. Dengan cara ini, huruf yang sama di plaintext bisa menjadi berbeda di ciphertextnya. Kenapa? Karena kuncinya tidak hanya satu huruf saja.

Polyalphabetic cipher (cipher abjad majemuk) menggunakan sejumlah monoa lphabetic cipher. Kebanyakan penerapan polyalphabetic cipher adalah mengulang kunci mono alphabetic selama n periode. n periode =  panjang plain text / panjang kunci. Untuk lebih jelasnya perhatikan penjelasan di bawah ini

Plaintext : KRIPTOGRAFI
Kunci : GREEN
Ciphertext : ?

Misal, A=0, B=1 .... Z=25, diketahui kunci = GREEN, sehingga kunci diperluas menjadi GREENGREENG sampai ukurannya sama dengan plain text.

(K+G) = (10+6) = 16 = Q
(R+R) = (17+17) = (34-26) = 8 = I
(I+E) = (8+4) = 12 = M
(P+E) = (15+4) = 19 = T

dst
     
 
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