diff --git a/.gitignore b/.gitignore
index d9f5d89..7568b27 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,15 @@
+# MacOS
+.DS_STORE
+
+# IDEs
 .idea
 *.iml
-.DS_STORE
+
+# Node
 node_modules
+
+# Other
 coverage
+cert/CA.*
+cert/localhost.*
+cert/server.csr
diff --git a/README.md b/README.md
index b8f9bd2..756ad1d 100644
--- a/README.md
+++ b/README.md
@@ -13,17 +13,6 @@ Serve static files or import as module in your project.
 [![npm version](https://img.shields.io/npm/v/https-localhost.svg)](https://www.npmjs.com/package/https-localhost?activeTab=versions)
 
 
-### Install and trust the certificate
-Add the [rootCA.pem](rootCA.pem) certificate to your list of trusted certificates.
-This step depends on the operating system you're running:
-
-- Mac OS: open Keychain Access, choose System from the left navigation bar, choose "Import items..." from the File app
-menu and select the file. Then double-click on the certificate and select always-trust in the Trust panel.
-
-- Linux: Depending on your Linux distribution, you can use `trust`, `update-ca-certificates` or another command to mark
-the generated root certificate as trusted.
-
-
 ### Use standalone
 From terminal navigate into the folder and run `sudo npm install -g` to install this tool globally.
 
@@ -51,5 +40,27 @@ To redirect the http traffic to https use `app.redirect()`.
 You can also serve static files with `app.serve(path)`
 
 
+### [Optional/Linux] Install and trust the certificate
+After `npm install` will run a script that tries to install and validate automatically the certificate.
+**Actually works only on MacOS.**
+
+However, this script is in beta and provided as-is, so there isn't any guarantee that will work.  
+For that reason you can also install the certificate manually, as follows.
+
+If you decide to not install it, it's fine, the package still work.
+However, visiting localhost there will be a invalid certificate issue.
+
+To trust the certificate just add the [cert/defaultCA.pem](cert/defaultCA.pem) certificate
+to your list of trusted certificates.
+
+This step depends on the operating system you're running:
+- Mac OS:
+    open Keychain Access, choose System from the left navigation bar, choose "Import items..." from the File app
+menu and select the file. Then double-click on the certificate and select always-trust in the Trust panel.
+- Linux:
+    Depending on your Linux distribution, you can use `trust`, `update-ca-certificates`
+or another command to mark the generated root certificate as trusted.
+
+
 ### License
 [AGPL-3.0](LICENSE)
diff --git a/cert/server.crt b/cert/default.crt
similarity index 100%
rename from cert/server.crt
rename to cert/default.crt
diff --git a/cert/server.key b/cert/default.key
similarity index 100%
rename from cert/server.key
rename to cert/default.key
diff --git a/rootCA.pem b/cert/defaultCA.pem
similarity index 100%
rename from rootCA.pem
rename to cert/defaultCA.pem
diff --git a/cert/generate.js b/cert/generate.js
new file mode 100644
index 0000000..6c4348d
--- /dev/null
+++ b/cert/generate.js
@@ -0,0 +1,34 @@
+const exec = require("child_process").exec
+
+// noinspection FallThroughInSwitchStatementJS
+switch (process.platform) {
+  case "darwin": // MacOS
+    console.log("\n----------------------------------------------\n" +
+                  "Please input your sudo password when required.\n" +
+                  "----------------------------------------------\n")
+    exec("bash cert/generate.sh", (error, stdout, stderr) => {
+      console.log(stdout)
+      console.error(stderr)
+      if (error !== null) console.error(`exec error: ${error}`)
+    })
+    break
+  case "linux":
+    console.warn("Cannot generate the localhost certificate on linux yet. " +
+      "Coming soon.")
+    process.exit(0)
+  case "win32":
+    console.warn("Cannot generate the localhost certificate on Windows.")
+    process.exit(0)
+  case "freebsd":
+    console.warn("Cannot generate the localhost certificate on freebsd. " +
+      "Help wanted.")
+    process.exit(0)
+  case "sunos":
+    console.warn("Cannot generate the localhost certificate on sunos. " +
+      "Help wanted.")
+    process.exit(0)
+  default:
+    console.warn("Cannot generate the localhost certificate on your " +
+      "platform. Contact the developer.")
+    process.exit(0)
+}
diff --git a/cert/generate.sh b/cert/generate.sh
new file mode 100644
index 0000000..b85a2a5
--- /dev/null
+++ b/cert/generate.sh
@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+
+# capture errors and notify the user
+set -e
+trap 'if [[ $? -ne 0 ]]; then echo "ERROR: something went wrong."; fi' EXIT
+
+# check the os
+case "$(uname -s)" in
+    Darwin*) machine=MacOS;;
+    Linux*)  machine=Linux
+        echo "Linux support coming soon"
+        exit 1;;
+    CYGWIN*) machine=Linux
+        echo "WARNING: Support for Cygwin not guaranteed. Trying with the Linux script (coming soon)."
+        exit 1;;
+    MINGW*)  machine=Linux
+        echo "WARNING: Support for MinGw not guaranteed. Trying with the Linux script (coming soon)."
+        exit 1;;
+    *) echo "Unknown operating system."; exit 1;;
+esac
+
+# generate the CA
+echo "Creating a certification authority to sign the certificate..."
+openssl req -x509 -newkey rsa:4096 -keyout cert/CA.key -out cert/CA.pem -days 1024 -nodes -subj "/C=US/ST=None/L=None/O=None/OU=None/CN=localhost"
+echo "Generated CA.key and CA.pem."
+
+# install the CA
+case ${machine} in
+    MacOS*)
+        sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain cert/CA.pem
+        ;;
+    Linux*)
+        echo "WARNING: Only Ubuntu is supported. No guarantee for other Linux distributions."
+        sudo mkdir /usr/local/share/ca-certificates/localhost
+        cp cert/CA.key /usr/local/share/ca-certificates/localhost/CA.key
+        cp cert/CA.pem /usr/local/share/ca-certificates/localhost/CA.pem
+        sudo chmod 775 /usr/local/share/ca-certificates/localhost
+        sudo update-ca-certificates
+        ;;
+    *) exit 1;;
+esac
+
+# crate the certificate
+echo "Creating a certificate for localhost and signing with out CA..."
+openssl req -new -sha256 -nodes -out cert/server.csr -newkey rsa:2048 -keyout cert/localhost.key -config cert/server.conf
+openssl x509 -req -in cert/server.csr -CAkey cert/CA.key -CA cert/CA.pem -CAcreateserial -out cert/localhost.crt -days 1024 -sha256 -extfile cert/x509.ext
+echo "Generated localhost.key and localhost.crt."
diff --git a/cert/server.conf b/cert/server.conf
new file mode 100644
index 0000000..4438bbb
--- /dev/null
+++ b/cert/server.conf
@@ -0,0 +1,14 @@
+[req]
+default_bits=2048
+prompt=no
+default_md=sha256
+distinguished_name=dn
+
+[dn]
+C=US
+ST=None
+L=None
+O=None
+OU=None
+emailAddress=mail@example.com
+CN=localhost
diff --git a/cert/x509.ext b/cert/x509.ext
new file mode 100644
index 0000000..ab9de5f
--- /dev/null
+++ b/cert/x509.ext
@@ -0,0 +1,7 @@
+authorityKeyIdentifier=keyid,issuer
+basicConstraints=CA:FALSE
+keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
+subjectAltName = @alt_names
+
+[alt_names]
+DNS.1 = localhost
diff --git a/index.js b/index.js
index 104e210..ab5cffb 100755
--- a/index.js
+++ b/index.js
@@ -12,9 +12,21 @@ const minify = require("express-minify")
 /* CONFIGURE THE SERVER */
 
 // SSL certificate
-const certOptions = {
-  key: fs.readFileSync(path.resolve(__dirname, "cert/server.key")),
-  cert: fs.readFileSync(path.resolve(__dirname, "cert/server.crt"))
+let certOptions
+try {
+  certOptions = {
+    key: fs.readFileSync(path.resolve(__dirname, "cert/localhost.key")),
+    cert: fs.readFileSync(path.resolve(__dirname, "cert/localhost.crt"))
+  }
+} catch (e) {
+  // istanbul ignore next
+  certOptions = {
+    key: fs.readFileSync(path.resolve(__dirname, "cert/default.key")),
+    cert: fs.readFileSync(path.resolve(__dirname, "cert/default.crt"))
+  }
+  // istanbul ignore next
+  console.warn("Using the default certificate. " +
+    "Validate it installing the defaultCA.pem certificate in the cert folder")
 }
 
 // create a server with express
@@ -53,7 +65,7 @@ app.serve = function(path = process.cwd(), port = process.env.PORT || 443) {
 /* MAIN (running as script) */
 
 // usage: `serve [<path>]` or `node index.js [<path>]`
-/* istanbul ignore if  */
+// istanbul ignore if
 if (require.main === module) {
   // retrieve the static path from the process argv or use the cwd
   // 1st is node, 2nd is serve or index.js, 3rd (if exists) is the path
diff --git a/package.json b/package.json
index 466aadb..6672883 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "scripts": {
     "pretest": "eslint --ignore-path .gitignore .",
     "test": "./node_modules/istanbul/lib/cli.js cover ./node_modules/mocha/bin/_mocha -- -R spec ./test/*.js --exit",
+    "postinstall": "node cert/generate.js",
     "start": "node index.js"
   },
   "bin": {
@@ -30,7 +31,7 @@
   "bugs": {
     "url": "https://github.com/daquinoaldo/https-localhost/issues"
   },
-  "homepage": "https://daquinoaldo.github.io/https-localhost/",
+  "homepage": "https://daquinoaldo.github.io/https-localhost",
   "dependencies": {
     "compression": "^1.7.3",
     "express": "^4.16.4",