diff --git a/src/core/config/Categories.json b/src/core/config/Categories.json
index 53ca796de..c81968285 100755
--- a/src/core/config/Categories.json
+++ b/src/core/config/Categories.json
@@ -111,7 +111,8 @@
             "Bombe",
             "Multiple Bombe",
             "Typex",
-            "Lorenz"
+            "Lorenz",
+            "SIGABA"
         ]
     },
     {
diff --git a/tests/operations/tests/SIGABA.mjs b/tests/operations/tests/SIGABA.mjs
new file mode 100644
index 000000000..f8b19c9df
--- /dev/null
+++ b/tests/operations/tests/SIGABA.mjs
@@ -0,0 +1,67 @@
+/**
+SIGABA machine tests
+
+@author hettysymes
+@copyright hettysymes 2020
+@license Apache-2.0
+*/
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "SIGABA: encrypt",
+        input: "hello world testing the sigaba machine",
+        expectedOutput: "ULBECJCZJBJFVUDLIXGLGIVXSYGMFRJVCERGOX",
+        recipeConfig: [
+            {
+                "op": "SIGABA",
+                "args": [
+                    "BHKWECJDOVAYLFMITUGXRNSPZQ", true, "G",
+                    "CDTAKGQOZXLVJYHSWMIBPRUNEF", false, "L",
+                    "WAXHJZMBVDPOLTUYRCQFNSGKEI", false, "I",
+                    "HUSCWIMJQXDALVGBFTOYZKRPNE", false, "T",
+                    "RTLSMNKXFVWQUZGCHEJBYDAIPO", false, "B",
+                    "GHAQBRJWDMNZTSKLOUXYPFIECV", false, "N",
+                    "VFLGEMTCXZIQDYAKRPBONHWSUJ", true, "Q",
+                    "ZQCAYHRJNXPFLKIOTBUSVWMGDE", false, "B",
+                    "EZVSWPCTULGAOFDJNBIYMXKQHR", false, "J",
+                    "ELKSGDXMVYJUZNCAROQBPWHITF", false, "R",
+                    "3891625740", "3",
+                    "6297135408", "1",
+                    "2389715064", "8",
+                    "9264351708", "6",
+                    "9573086142", "6",
+                    "Encrypt"
+                ]
+            }
+        ]
+    },
+    {
+        name: "SIGABA: decrypt",
+        input: "helloxworldxtestingxthexsigabaxmachine",
+        expectedOutput: "XWCIWSAIQKNPBUKAP QXVYW RRNYAWXKRBGCQS",
+        recipeConfig: [
+            {
+                "op": "SIGABA",
+                "args": [
+                    "ZECIPSQVBYKJTNRLOXUFGAWHMD", false, "C",
+                    "IPHECDYSZTRXQUKWNVGOBLFJAM", true, "J",
+                    "YHXUSRKIJVQWTPLAZOMDCGNEFB", true, "Z",
+                    "TDPVSOBXULANZQYEHIGFMCRWJK", false, "W",
+                    "THZGFXQRVBSDUICNYJWPAEMOKL", false, "F",
+                    "KOVUTBMZQWGYDNAICSPHERXJLF", false, "F",
+                    "DSTRLAUFXGWCEOKQPVMBZNIYJH", true, "A",
+                    "KCULNSIXJDPEHGQYRTFZVWOBAM", false, "H",
+                    "DZANEQLOWYRXKGUSIVJFMPBCHT", true, "M",
+                    "MVRLHTPFWCAOKEGXZBJYIQUNSD", false, "E",
+                    "9421765830", "3",
+                    "3476815902", "2",
+                    "5701842693", "7",
+                    "4178920536", "0",
+                    "5243709861", "1",
+                    "Decrypt"
+                ]
+            }
+        ]
+    }
+]);