diff --git a/crypto-square.json b/crypto-square.json
new file mode 100644
index 0000000000..3b0a0bbfaa
--- /dev/null
+++ b/crypto-square.json
@@ -0,0 +1,97 @@
+{
+  "normalized_plaintext": {
+    "description": "the spaces and punctuation are removed from the English text and the message is downcased",
+    "cases": [
+      {
+        "description": "Lowercase",
+        "plaintext": "Hello",
+        "expected": "hello"
+      },
+      {
+        "description": "Remove spaces",
+        "plaintext": "Hi there",
+        "expected": "hithere"
+      },
+      {
+        "description": "Remove punctuation",
+        "plaintext": "@1, 2%, 3 Go!",
+        "expected": "123go"
+      }
+    ]
+  },
+  "plaintext_segments": {
+    "description": "The plaintext should be organized in to a rectangle.  The size of the rectangle (`r x c`) should be decided by the length of the message, such that `c >= r` and `c - r <= 1`, where `c` is the number of columns and `r` is the number of rows.",
+    "cases": [
+      {
+        "description": "empty plaintext results in an empty rectangle",
+        "plaintext": "",
+        "expected": "[]"
+      },
+      {
+        "description": "4 character plaintext results in an 2x2 rectangle",
+        "plaintext": "Ab Cd",
+        "expected": [
+          "ab",
+          "cd"
+        ]
+      },
+      {
+        "description": "9 character plaintext results in an 3x3 rectangle",
+        "plaintext": "This is fun!",
+        "expected": [
+          "thi",
+          "sis",
+          "fun"
+        ]
+      },
+      {
+        "description": "54 character plaintext results in an 8x7 rectangle",
+        "plaintext": "If man was meant to stay on the ground, god would have given us roots.",
+        "expected": [
+          "ifmanwas",
+          "meanttos",
+          "tayonthe",
+          "groundgo",
+          "dwouldha",
+          "vegivenu",
+          "sroots"
+        ]
+      }
+    ]
+  },
+  "encoded": {
+    "description": "The coded message is obtained by reading down the columns going left to right.",
+    "cases": [
+      {
+        "description": "empty plaintext results in an empty encode",
+        "plaintext": "",
+        "expected": ""
+      },
+      {
+        "description": "Non-empty plaintext results in the combined plaintext segments",
+        "plaintext": "If man was meant to stay on the ground, god would have given us roots.",
+        "expected": "imtgdvsfearwermayoogoanouuiontnnlvtwttddesaohghnsseoau"
+      }
+    ]
+  },
+  "ciphertext": {
+    "description": "Output the encoded text in chunks.  Phrases that fill perfect squares `(r X r)` should be output in `r`-length chunks separated by spaces.  Imperfect squares will have `n` empty spaces.  Those spaces should be distributed evenly across the last `n` rows.",
+    "cases": [
+      {
+        "description": "empty plaintext results in an empty ciphertext",
+        "plaintext": "",
+        "expected": ""
+      },
+      {
+        "description": "9 character plaintext results in 3 chunks of 3 characters",
+        "plaintext": "This is fun!",
+        "expected": "tsf hiu isn"
+      },
+      {
+        "description": "54 character plaintext results in 7 chunks, the last two padded with spaces",
+        "plaintext": "If man was meant to stay on the ground, god would have given us roots.",
+        "expected": "imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn  sseoau "
+      }
+    ]
+  }
+}