diff --git a/divtest.sh b/divtest.sh
new file mode 100755
index 0000000..aa70079
--- /dev/null
+++ b/divtest.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+in=111111111111
+
+echo "- same clear text slightly different key"
+for K in 1 2 3 4 5 6 7 8; do
+    k="0000000000000000000$K"
+    echo -n "IN: $in, KEY: $k, NONCE: $K, OUT: "
+    echo -n "$in" | ./twenty4 $k $K | hexdump | head -1 | sed 's/^0000000 //'
+done
+
+echo
+
+k="00000000000000000001"
+echo "- same key, slightly different clear text"
+for N in 1 2 3 4 5 6 7 8; do
+    in="11111111111$N"
+    echo -n "IN: $in, KEY: $k, NONCE: $N, OUT: "
+    echo -n "$in" | ./twenty4 $k $N | hexdump | head -1 | sed 's/^0000000 //'
+done