diff --git a/codyze-specification-languages/coko/coko-dsl/src/test/resources/security-example/BlockCipher.codyze.kts b/codyze-specification-languages/coko/coko-dsl/src/test/resources/security-example/BlockCipher.codyze.kts
new file mode 100644
index 000000000..761cb1687
--- /dev/null
+++ b/codyze-specification-languages/coko/coko-dsl/src/test/resources/security-example/BlockCipher.codyze.kts
@@ -0,0 +1,16 @@
+interface BlockCiper {
+    fun algorithm(algo: Any): Op
+    fun blockLength(length: Any): Op
+    fun mode(mode: Any): Op
+    fun padding(pad: Any): Op
+}
+
+
+// TODO: need evaluator with condition so we can check if algorithm is AES
+@Rule(description = "Check the block length of AES")
+fun `correct AES block length`(blockCiper: BlockCiper) =
+    only(blockCiper.blockLength(listOf(128, 192, 256)))
+
+@Rule(description = "Check the operation mode of ")
+fun `correct mode`(blockCiper: BlockCiper) =
+    only(blockCiper.mode(listOf("CCM", "GCM", "CBC", "CTR")))
\ No newline at end of file
diff --git a/codyze-specification-languages/coko/coko-dsl/src/test/resources/security-example/BouncyCastleCipher.codyze.kts b/codyze-specification-languages/coko/coko-dsl/src/test/resources/security-example/BouncyCastleCipher.codyze.kts
new file mode 100644
index 000000000..357edc296
--- /dev/null
+++ b/codyze-specification-languages/coko/coko-dsl/src/test/resources/security-example/BouncyCastleCipher.codyze.kts
@@ -0,0 +1,24 @@
+@file:Import("BlockCipher.codyze.kts")
+
+class Cipher {
+
+}
+
+class BouncyCastleBlockCipher: BlockCipher_codyze.BlockCiper {
+    override fun algorithm(algo: Any): Op {
+        TODO("Not yet implemented")
+    }
+
+    override fun blockLength(length: Any): Op {
+        TODO("Not yet implemented")
+    }
+
+    override fun mode(mode: Any): Op {
+        TODO("Not yet implemented")
+    }
+
+    override fun padding(pad: Any): Op {
+        TODO("Not yet implemented")
+    }
+
+}
\ No newline at end of file