diff --git a/etc/test/regression_test.sh b/etc/test/regression_test.sh
new file mode 100644
index 0000000..f5308d6
--- /dev/null
+++ b/etc/test/regression_test.sh
@@ -0,0 +1,81 @@
+#!/bin/bash
+cd -- "$(dirname -- "${BASH_SOURCE[0]}")"
+
+if [ ! -x "bin/slunkcrypt-a" ]; then
+	echo "Executbale file \"bin/slunkcrypt-a\" not found !!!"
+	exit 1
+fi
+if [ ! -x "bin/slunkcrypt-b" ]; then
+	echo "Executbale file \"bin/slunkcrypt-b\" not found !!!"
+	exit 1
+fi
+
+rm -rf "org" "enc" "out"
+mkdir -p "bin" "org" "enc" "out"
+
+readonly PASSWD=("T25na1i{XYuUMFDi2fRqk258" "dq22Z.[[>C9zml#n)<e)vFkG")
+
+# Generate input files
+echo -e "\n\033[1;36m---===[ generate input ]===---\033[0m\n"
+for i in 1 13 31 89 223 503 997 2477 5003 9973 24989 50021 99991 249989 500009 999983 134217757; do
+	echo "Generating \"$(printf "%07X" ${i}).bin\" please wait..."
+	dd if="/dev/urandom" of="org/$(printf "%07X" ${i}).bin" bs=1 count=${i}
+	for j in {1..7}; do
+		echo "Generating \"$(printf "%07X" $(($i + $j))).bin\" please wait..."
+		cp -f "org/$(printf "%07X" ${i}).bin" "org/$(printf "%07X" $(($i + $j))).bin"
+		dd oflag=append conv=notrunc if="/dev/urandom" of="org/$(printf "%07X" $(($i + $j))).bin" bs=1 count=${j}
+	done
+done
+
+for file in org/*; do
+	name="$(basename -- "$file")"
+	echo -e "\n\033[1;36m---===[ ${name} ]===---\033[0m\n"
+
+	# Encrypt -A-
+	for i in {0..1}; do
+		if ! ${BASH} -x -c "bin/slunkcrypt-a -e \"pass:${PASSWD[$i]}\" \"${file}\" \"enc/${name}~~A${i}\""; then
+			echo -e "\n\033[1;31mError: File could not be encoded !!!\033[0m"
+			exit 1
+		fi
+	done
+
+	# Encrypt -B-
+	for i in {0..1}; do
+		if ! ${BASH} -x -c "bin/slunkcrypt-b -e \"pass:${PASSWD[$i]}\" \"${file}\" \"enc/${name}~~B${i}\""; then
+			echo -e "\n\033[1;31mError: File could not be encoded !!!\033[0m"
+			exit 1
+		fi
+	done
+
+	# Print hash
+	sha256sum "enc/${name}~~"* && echo ""
+
+	# Decrypt -A/B-
+	for i in {0..1}; do
+		if ! ${BASH} -x -c "bin/slunkcrypt-a -d \"pass:${PASSWD[$i]}\" \"enc/${name}~~B${i}\" \"out/${name}~~A${i}\""; then
+			echo -e "\n\033[1;31mError: File could not be decoded !!!\033[0m"
+			exit 1
+		fi
+		if ! cmp "out/${name}~~A${i}" "${file}"; then
+			echo -e "\n\033[1;31mError: Decoded file does *not* match original !!!\033[0m"
+			exit 1
+		fi
+	done
+
+	# Decrypt -B/A-
+	for i in {0..1}; do
+		if ! ${BASH} -x -c "bin/slunkcrypt-b -d \"pass:${PASSWD[$i]}\" \"enc/${name}~~A${i}\" \"out/${name}~~B${i}\""; then
+			echo -e "\n\033[1;31mError: File could not be decoded !!!\033[0m"
+			exit
+		fi
+		if ! cmp "out/${name}~~A${i}" "out/${name}~~B${i}"; then
+			echo -e "\n\033[1;31mError: Decoded files are *not* the same !!!\033[0m"
+			exit 1
+		fi
+	done
+
+	# Print hash
+	sha256sum "out/${name}~~"* && echo ""
+done
+
+echo -e "\n\033[1;32mAll tests have completed successfully!\033[0m"
diff --git a/etc/test/testbed.sh b/etc/test/testbed.sh
deleted file mode 100644
index 732adb3..0000000
--- a/etc/test/testbed.sh
+++ /dev/null
@@ -1,52 +0,0 @@
-#!/bin/bash
-cd -- "$(dirname -- "${BASH_SOURCE[0]}")"
-
-rm -rf "enc" "out"
-mkdir -p "bin" "org" "enc" "out"
-
-readonly PASSWD="T25na1i{XYuUMFDi2fRqk258"
-
-for file in org/*; do
-	name="$(basename -- "$file")"
-	
-	# Encrypt -A-
-	echo -e "\n\033[1;36m---===[ ${name} ]===---\033[0m\n"
-	if ! ${BASH} -x -c "bin/slunkcrypt-a -e \"pass:${PASSWD}\" \"${file}\" \"enc/${name}~~A\""; then
-		echo -e "\n\033[1;31mError: File could not be encoded !!!\033[0m"
-		exit 1
-	fi
-
-	# Encrypt -B-
-	if ! ${BASH} -x -c "bin/slunkcrypt-b -e \"pass:${PASSWD}\" \"${file}\" \"enc/${name}~~B\""; then
-		echo -e "\n\033[1;31mError: File could not be encoded !!!\033[0m"
-		exit 1
-	fi
-	
-	# Print hash
-	sha256sum "enc/${name}~~A" "enc/${name}~~B" && echo ""
-
-	# Decrypt -A/B-
-	if ! ${BASH} -x -c "bin/slunkcrypt-a -d \"pass:${PASSWD}\" \"enc/${name}~~B\" \"out/${name}~~A\""; then
-		echo -e "\n\033[1;31mError: File could not be decoded !!!\033[0m"
-		exit 1
-	fi
-	if ! cmp "out/${name}~~A" "${file}"; then
-		echo -e "\n\033[1;31mError: Decoded file does *not* match original !!!\033[0m"
-		exit 1
-	fi
-	
-	# Decrypt -B/A-
-	if ! ${BASH} -x -c "bin/slunkcrypt-b -d \"pass:${PASSWD}\" \"enc/${name}~~A\" \"out/${name}~~B\""; then
-		echo -e "\n\033[1;31mError: File could not be decoded !!!\033[0m"
-		exit
-	fi
-	if ! cmp "out/${name}~~A" "out/${name}~~B"; then
-		echo -e "\n\033[1;31mError: Decoded files are *not* the same !!!\033[0m"
-		exit 1
-	fi
-	
-	# Print hash
-	sha256sum "out/${name}~~A" "out/${name}~~B" && echo ""
-done
-
-echo -e "\n\033[1;32mAll tests have completed successfully!\033[0m"