Playfair cipher: Difference between revisions

Content added Content deleted

Inline

@@ Line 1,126: / Line 1,126: @@
     encod = Dict()
-    # Map pairs in same row of matrix m.
+    # Map pairs in same row or same column of matrix m.
     for i in 1:5, j in 1:5, k in 1:5
         if j != k
             encod[m[i, j] * m[i, k]] = m[i, mod1(j + 1, 5)] * m[i, mod1(k + 1, 5)]
         end
-    end
-    # Map pairs in same column of matrix m.
-    for j in 1:5, i in 1:5, k in 1:5
         if i != k
             encod[m[i, j] * m[k, j]] = m[mod1(i + 1, 5), j] * m[mod1(k + 1, 5), j]
         end
+        # Map pairs not on same row or same column.
-    end
+        for l in 1:5
-    # Map pairs not on same row or same column.
+            if i != k && j != l
-    for (i1, j1, i2, j2) in [(a, b, c, d) for a in 1:5, b in 1:5, c in 1:5, d in 1:5]
+                encod[m[i, j] * m[k, l]] = m[i, l] * m[k, j]
-        if i1 != i2 && j1 != j2
+            end
-            encod[m[i1, j1] * m[i2, j2]] = m[i1, j2] * m[i2, j1]
         end
     end