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"Sandi Gronfeld Chiper"
Gronsfeld Cipher merupakan penyandian yang cara kerjanya menyerupai sandi Vigenere. Gronsfeld Cipher memakai kunci dari bilangan desimal bukan huruf, tetapi saya berpikir 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.
Menggunakan rumus Gronfeld Chiper :
1.) enkripsi E(x) = (P(x) + K(x)) mod 26
Enkripsi itu u/ mengubah dari text asli menjadi sandinya
E (Enkripsi)
P (Plaintext)
K (Kunci) *Biasanya dominan angka*
Mod 26 (Susunan abcnya)
2.) dekripsinya, u/ mencari kata aslinya, rumusnya yaitu
Dekripsi : D(x) = (P(x) – K(x)) mod 26
perbedaan : enkripsi ditambah sedangkan deskripsi dikurang.
contohnya nya untuk enkripsi"
Plaintxt : Mikhail
Key : 1234512
M = 14
K = 1
14+1 = 15
Huruf ke 15 = O
P : M -> 13
K : 1
13+1 = 14 (N)
I -> 9
K : 2
9+2 = 11 (K)
Begitulah seterusnya sehingga enkripsi MIKHAIL itu "NKMLFJN"
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