Merge pull request #110 from TowKnee0/my-branch

TowKnee0 | Scytale Cipher | new

Author: josharsh

Scytale Cipher/README.md

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+# Scytale Cipher
+
+Very basic implementation of the Scytale cipher.

Scytale Cipher/cipher.py

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+
+def encrypt(key, plaintext):
+
+    grid = []
+    row = []
+
+    for letter in plaintext:
+        row.append(letter)
+        if len(row) == key:
+            grid.append(row)
+            row = []
+
+    text = []
+
+    for col in range(key):
+        temp = []
+        for row in grid:
+            temp.append(row[col])
+        text.append(str.join('', temp))
+
+    return str.join('', text)
+
+
+def decrypt(key, ciphertext):
+
+    rows = len(ciphertext) // key
+    grid = []
+
+    for row in range(rows):
+        temp_row = []
+        for i in range(key):
+            temp_row.append(ciphertext[row + i * rows])
+        grid.append(temp_row)
+
+    rows = []
+
+    for i in range(len(grid)):
+        rows.append(str.join('', grid[i]))
+
+    return str.join('', rows)