diff --git a/README-zh.md b/README-zh.md
index 22a177c..166e3f9 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -59,6 +59,14 @@ OpenVZ VPS 用户请使用其它的 VPN 软件，比如 <a href="https://github.
 
 首先，更新你的系统： 运行 `apt-get update && apt-get dist-upgrade` 并重启。这一步是可选的，但推荐。
 
+**选项 1:** 使用脚本随机生成的 VPN 登录凭证 （在安装完成后显示）：
+
+```bash
+wget https://git.io/vpnsetup -O vpnsetup.sh && sudo sh vpnsetup.sh
+```
+
+**选项 2:** 或者，在脚本中输入你自己的 VPN 登录凭证：
+
 ```bash
 wget https://git.io/vpnsetup -O vpnsetup.sh
 nano -w vpnsetup.sh
@@ -70,8 +78,15 @@ sudo sh vpnsetup.sh
 
 首先，更新你的系统： 运行 `yum update` 并重启。这一步是可选的，但推荐。
 
+**选项 1:** 使用脚本随机生成的 VPN 登录凭证 （在安装完成后显示）：
+
+```bash
+wget https://git.io/vpnsetup-centos -O vpnsetup_centos.sh && sudo sh vpnsetup_centos.sh
+```
+
+**选项 2:** 或者，在脚本中输入你自己的 VPN 登录凭证：
+
 ```bash
-yum -y install wget nano
 wget https://git.io/vpnsetup-centos -O vpnsetup_centos.sh
 nano -w vpnsetup_centos.sh
 [修改为你自己的值： IPSEC_PSK, VPN_USER 和 VPN_PASSWORD]
diff --git a/README.md b/README.md
index bc9ccf5..56949fa 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,14 @@ OpenVZ VPS users should instead try <a href="https://github.com/Nyr/openvpn-inst
 
 First, update your system with `apt-get update && apt-get dist-upgrade` and reboot. This is optional, but recommended.
 
+**Option 1:** Have the script generate random VPN credentials for you (will be displayed when done):
+
+```bash
+wget https://git.io/vpnsetup -O vpnsetup.sh && sudo sh vpnsetup.sh
+```
+
+**Option 2:** Alternatively, enter your own VPN credentials in the script:
+
 ```bash
 wget https://git.io/vpnsetup -O vpnsetup.sh
 nano -w vpnsetup.sh
@@ -70,8 +78,15 @@ sudo sh vpnsetup.sh
 
 First, update your system with `yum update` and reboot. This is optional, but recommended.
 
+**Option 1:** Have the script generate random VPN credentials for you (will be displayed when done):
+
+```bash
+wget https://git.io/vpnsetup-centos -O vpnsetup_centos.sh && sudo sh vpnsetup_centos.sh
+```
+
+**Option 2:** Alternatively, enter your own VPN credentials in the script:
+
 ```bash
-yum -y install wget nano
 wget https://git.io/vpnsetup-centos -O vpnsetup_centos.sh
 nano -w vpnsetup_centos.sh
 [Replace with your own values: IPSEC_PSK, VPN_USER and VPN_PASSWORD]
diff --git a/vpnsetup.sh b/vpnsetup.sh
index c14a733..6089788 100644
--- a/vpnsetup.sh
+++ b/vpnsetup.sh
@@ -15,20 +15,21 @@
 # Attribution required: please include my name in any derivative and let me
 # know how you have improved it!
 
-# ------------------------------------------------------------
+# =====================================================
 
 # Define your own values for these variables
+# - IPsec Pre-Shared Key, VPN Username and Password
 # - All values MUST be quoted using 'single quotes'
 # - DO NOT use these characters inside values:  \ " '
 
-IPSEC_PSK='your_ipsec_pre_shared_key'
-VPN_USER='your_vpn_username'
-VPN_PASSWORD='your_very_secure_password'
+IPSEC_PSK=''
+VPN_USER=''
+VPN_PASSWORD=''
 
 # Important Notes:   https://git.io/vpnnotes
 # Setup VPN Clients: https://git.io/vpnclients
 
-# ------------------------------------------------------------
+# =====================================================
 
 export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
 
@@ -59,6 +60,12 @@ if [ ! -f /sys/class/net/eth0/operstate ]; then
   exit 1
 fi
 
+if [ -z "$IPSEC_PSK" ] && [ -z "$VPN_USER" ] && [ -z "$VPN_PASSWORD" ]; then
+  IPSEC_PSK="$(< /dev/urandom tr -dc 'A-HJ-NPR-Za-km-z2-9' | head -c 16)"
+  VPN_USER=vpnuser
+  VPN_PASSWORD="$(< /dev/urandom tr -dc 'A-HJ-NPR-Za-km-z2-9' | head -c 16)"
+fi
+
 if [ -z "$IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
   echo "VPN credentials cannot be empty. Edit the script and re-enter."
   exit 1
@@ -411,7 +418,8 @@ service ipsec start
 service xl2tpd start
 
 echo
-echo '============================================='
+echo '================================================'
+echo
 echo 'IPsec/L2TP VPN server setup is complete!'
 echo
 echo 'Connect to your new VPN with these details:'
@@ -420,10 +428,13 @@ echo "Server IP: $PUBLIC_IP"
 echo "IPsec PSK: $IPSEC_PSK"
 echo "Username: $VPN_USER"
 echo "Password: $VPN_PASSWORD"
-echo '============================================='
+echo
+echo "Write these down. You'll need them to connect! "
 echo
 echo 'Important Notes:   https://git.io/vpnnotes'
 echo 'Setup VPN Clients: https://git.io/vpnclients'
 echo
+echo '================================================'
+echo
 
 exit 0
diff --git a/vpnsetup_centos.sh b/vpnsetup_centos.sh
index d0c9eb2..2d78014 100644
--- a/vpnsetup_centos.sh
+++ b/vpnsetup_centos.sh
@@ -15,20 +15,21 @@
 # Attribution required: please include my name in any derivative and let me
 # know how you have improved it!
 
-# ------------------------------------------------------------
+# =====================================================
 
 # Define your own values for these variables
+# - IPsec Pre-Shared Key, VPN Username and Password
 # - All values MUST be quoted using 'single quotes'
 # - DO NOT use these characters inside values:  \ " '
 
-IPSEC_PSK='your_ipsec_pre_shared_key'
-VPN_USER='your_vpn_username'
-VPN_PASSWORD='your_very_secure_password'
+IPSEC_PSK=''
+VPN_USER=''
+VPN_PASSWORD=''
 
 # Important Notes:   https://git.io/vpnnotes
 # Setup VPN Clients: https://git.io/vpnclients
 
-# ------------------------------------------------------------
+# =====================================================
 
 export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
 
@@ -71,6 +72,12 @@ if [ ! -f /sys/class/net/eth0/operstate ]; then
   exit 1
 fi
 
+if [ -z "$IPSEC_PSK" ] && [ -z "$VPN_USER" ] && [ -z "$VPN_PASSWORD" ]; then
+  IPSEC_PSK="$(< /dev/urandom tr -dc 'A-HJ-NPR-Za-km-z2-9' | head -c 16)"
+  VPN_USER=vpnuser
+  VPN_PASSWORD="$(< /dev/urandom tr -dc 'A-HJ-NPR-Za-km-z2-9' | head -c 16)"
+fi
+
 if [ -z "$IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
   echo "VPN credentials cannot be empty. Edit the script and re-enter."
   exit 1
@@ -430,7 +437,8 @@ service ipsec start
 service xl2tpd start
 
 echo
-echo '============================================='
+echo '================================================'
+echo
 echo 'IPsec/L2TP VPN server setup is complete!'
 echo
 echo 'Connect to your new VPN with these details:'
@@ -439,10 +447,13 @@ echo "Server IP: $PUBLIC_IP"
 echo "IPsec PSK: $IPSEC_PSK"
 echo "Username: $VPN_USER"
 echo "Password: $VPN_PASSWORD"
-echo '============================================='
+echo
+echo "Write these down. You'll need them to connect! "
 echo
 echo 'Important Notes:   https://git.io/vpnnotes'
 echo 'Setup VPN Clients: https://git.io/vpnclients'
 echo
+echo '================================================'
+echo
 
 exit 0