diff --git a/cpp/decrypt.cpp b/cpp/decrypt.cpp
new file mode 100644
index 0000000..92a0d84
--- /dev/null
+++ b/cpp/decrypt.cpp
@@ -0,0 +1,37 @@
+// ==============================================================================
+//
+//    Use:
+//    decrypt("HWe o!lordll", 4)
+//    => "Hello World!"
+//
+// ==============================================================================
+
+#include <string>
+
+std::string decrypt(std::string s, int n) {
+    if(n<2) return s; 
+
+    std::string res = s;
+
+    int a = -1, b = 2 * (n - 1) - 1, c = a, idx = 0;
+
+    for(int i=0; i<n; i++) {
+        int j = i;
+
+        while(j<s.length()) {
+            res[j] = s[idx];
+            idx++;
+
+            if(a>0 && b>0) c = c == a ? b : a;
+            else c = a > b ? a : b;
+
+            j += c + 1;
+        }
+
+        a += 2;
+        b -= 2;
+        c = a;
+    }
+
+    return res;
+}
\ No newline at end of file
diff --git a/cpp/encrypt.cpp b/cpp/encrypt.cpp
new file mode 100644
index 0000000..2a27747
--- /dev/null
+++ b/cpp/encrypt.cpp
@@ -0,0 +1,36 @@
+// ==============================================================================
+//
+//    Use:
+//    encrypt("Hello World", 4)
+//    => "HWe o!lordll"
+//
+// ==============================================================================
+
+#include <string>
+
+std::string encrypt(std::string s, int n) {
+    if(n<2) return s; 
+
+    std::string res;
+
+    int a = -1, b = 2 * (n - 1) - 1, c;
+
+    for(int i=0; i<n; i++) {
+        int j = i;
+
+        while(j<s.length()) {
+            res += s[j];
+            
+            if(a>0 && b>0) c = (c == a ? b : a);
+            else c = a > b ? a : b;
+
+            j += c + 1;
+        }
+
+        a += 2;
+        b -= 2;
+        c = a;
+    }
+
+    return res;
+}
\ No newline at end of file