diff --git a/Lab04/code/part01-analyze/go.mod b/Lab04/code/part01-analyze/go.mod
index 66a5324..fd5752b 100644
--- a/Lab04/code/part01-analyze/go.mod
+++ b/Lab04/code/part01-analyze/go.mod
@@ -1,4 +1,4 @@
-module frequency
+module analyze
 
 go 1.18
 
diff --git a/Lab04/code/part01-analyze/makefile b/Lab04/code/part01-analyze/makefile
index 97fb1c3..782b893 100644
--- a/Lab04/code/part01-analyze/makefile
+++ b/Lab04/code/part01-analyze/makefile
@@ -4,7 +4,7 @@ GoBUILD=$(GoCMD) build
 GoCLEAN=$(GoCMD) clean
 GoTEST=$(GoCMD) test
 GoMOD=$(GoCMD) mod
-BINARY_NAME=frequency
+BINARY_NAME=tool
 
 # To install GoLang please follow the installation instructions on https://go.dev/
 all: build
diff --git a/Lab04/code/part01-encrypt/go.mod b/Lab04/code/part01-encrypt/go.mod
new file mode 100644
index 0000000..783593c
--- /dev/null
+++ b/Lab04/code/part01-encrypt/go.mod
@@ -0,0 +1,3 @@
+module encrypt
+
+go 1.18
diff --git a/Lab04/code/part01-encrypt/go.sum b/Lab04/code/part01-encrypt/go.sum
new file mode 100644
index 0000000..e69de29
diff --git a/Lab04/code/part01-encrypt/main.go b/Lab04/code/part01-encrypt/main.go
new file mode 100644
index 0000000..f3ae387
--- /dev/null
+++ b/Lab04/code/part01-encrypt/main.go
@@ -0,0 +1,7 @@
+package main
+
+import (
+)
+
+func main() {
+}
diff --git a/Lab04/code/part01-encrypt/makefile b/Lab04/code/part01-encrypt/makefile
new file mode 100644
index 0000000..782b893
--- /dev/null
+++ b/Lab04/code/part01-encrypt/makefile
@@ -0,0 +1,17 @@
+# Go parameters
+GoCMD=go
+GoBUILD=$(GoCMD) build
+GoCLEAN=$(GoCMD) clean
+GoTEST=$(GoCMD) test
+GoMOD=$(GoCMD) mod
+BINARY_NAME=tool
+
+# To install GoLang please follow the installation instructions on https://go.dev/
+all: build
+build:
+	$(GoBUILD) -o $(BINARY_NAME) -v
+clean:
+	$(GOCLEAN)
+	rm -f $(BINARY_NAME)
+deps:
+	$(GoMOD) tidy
\ No newline at end of file