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Jumat, 12 Agustus 2016
@darxblood - M26113 - Cryptology - Dragonta
Materi : Gronsfeld Chiper
Gronsfeld Cipher merupakan penyandian yang cara kerjanya menyerupai sandi Vigenere. Gronsfeld Cipher memakai kunci dari bilangan desimal bukan huruf, tetapi implementasinya bisa menggunakan huruf. Kunci akan di ulang secara periodik dengan maksud bahwa setiap plainteks memiliki kunci. Jadi kunci sama panjangnya dengan plainteks.
Saat pemakai memasukkan kunci yang lebih kecil panjangnya dari plainteks maka secara otomatis kunci akan di ulang dari awal untuk plainteks berikutnya. Ini yang di maksudkan dengan periodik. Digunakan pada abad 17, yang hanya memakai simbol abjad saja dari A-Z.
Contoh:
Kata yg akan disandikan : DETEKTIF
Key : 2205
D E T E K T I F
2 2 0 5 2 2 0 5
- Rumus -
Enkripsi utk mengubah dari text asli mnjd sandinya
E (Enkripsi)
P (Plaintext)
K (Kunci) *Biasanya dominan angka*
Mod 26 (Susunan abcnya)
A. Enkripsi :
E(x) = (P(x) + K(x)) mod 26
B. Dekripsi :
Dekripsi utk mencari kata aslinya
Dekripsi : D(x) = (P(x) – K(x)) mod 26
Cth.
Plaintxt : M I K H A I L
Key : 1 2 3 4 5 1 2
M = 13
K = 1
13+1 = 14
Huruf ke 14 = N
I -> 9
K : 2
9+2 = 11 (K)
Sehingga enkripsi MIKHAIL itu "NKMLFJN"
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