How can I encrypt form data in Java web app?

Question

I am using JSP and Servlet to build a simple app, how can I encrypt form data before submit? here is my JSP:

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        
        <h1>Enter the text</h1>
        <%
            String txt=" ";
            txt = (String) request.getAttribute("lower");
           
        %>
        <form action="ser1">
           
            <textarea name="txt" rows="3" cols="20"  placeholder="Enter here"></textarea>
            <textarea  rows="3" cols="20" > <%=txt%></textarea>
           
            <input type="submit">
        </form>

    </body>
</html>

And here is processRequest method in the Servlet:

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       String txt = request.getParameter("txt");
       request.setAttribute("lower", txt.toLowerCase()); 
       this.getServletContext().getRequestDispatcher("/1.jsp").forward(request, response);
       
    }

Basil Bourque · Accepted Answer · 2021-07-04 19:58:53Z

2

Encrypted over the network

If you use a secure https web connection via TLS, the data is already encrypted over the network. This can be accomplished via Web server configuration settings, with no need to change your web app coding.

Web browsers and web servers have already been built to the latest encryption technologies. This includes Java-based servers such as Apache Tomcat & TomEE, Eclipse Jetty, Glassfish & Payara, WildFly & JBoss, OpenLiberty & WebSphere, and so on.

No need for you to reinvent that wheel.

Encrypted storage

If you want the data stored in an encrypted format, that encryption should be performed on the backed by the server software, not the web client.

Get the data from the client to the server via https/TLS, then encrypt on the backend.

edited Jul 4, 2021 at 19:58

answered Jul 3, 2021 at 20:09

Basil Bourque

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How can I encrypt form data in Java web app?

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Encrypted over the network

Encrypted storage

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