diff --git a/set1/Makefile b/set1/Makefile
index 411a122..ec9b258 100644
--- a/set1/Makefile
+++ b/set1/Makefile
@@ -1,10 +1,11 @@
 CC      = gcc
-CFLAGS  = -Wall -Wpedantic -Wextra -std=c99
-DEBUG   = -g
+CFLAGS  = -Wall -Wpedantic -Wextra -std=c99 -fstack-protector-all \
+          -fdiagnostics-color=auto
+DEBUG   = -0g -ggdb
 LINK    = 
 SRC_DIR = src
 OUT_DIR = bin
-TARGETS = base64
+TARGETS = base64 fixed-xor
 
 
 all: $(TARGETS)
diff --git a/set1/src/fixed-xor.c b/set1/src/fixed-xor.c
new file mode 100644
index 0000000..0f95f02
--- /dev/null
+++ b/set1/src/fixed-xor.c
@@ -0,0 +1,31 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/*
+void fixed_xor_stream(uint8_t *key, size_t key_len)
+{
+	//
+}
+*/
+
+void fixed_xor(const uint8_t *data, const uint8_t *key, const size_t key_len)
+{
+	uint8_t c;
+	size_t i;
+	for (i = 0; i < key_len; ++i) {
+		c = data[i] ^ key[i];
+		putchar(c);
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	char data[] = "\x1c\x01\x11\x00\x1f\x01\x01\x00\x06\x1a\x02\x4b\x53\x53\x50\x09\x18\x1c";
+	char key[] = "\x68\x69\x74\x20\x74\x68\x65\x20\x62\x75\x6c\x6c\x27\x73\x20\x65\x79\x65";
+
+	fixed_xor(data, key, sizeof(key));
+
+	return EXIT_SUCCESS;
+}
+