Encrypt dan Decrypt image use Rail Fence Cipher in Python

Given a plain-text message and a numeric key, cipher/de-cipher the given text using Rail Fence algorithm.
The rail fence cipher (also called a zigzag cipher) is a form of transposition cipher. It derives its name from the way in which it is encoded.

Rail Fence Cipher (RFC) adalah algoritma klasik model algoritma transposisi, Cipher (Algoritma) ini hampir mirip sistem kerjanya dengan Zig-zag Cipher.
Rail Fence Cipher menggunakan teknik perubahan posisi berdasarkan tingkatan, dimana nilai tingkatan disebut kunci enkripsi dan dekripsi dalam algoritma ini.

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