For success in any line of business it is essential that people can trust you. This is particularly true on the internet, as your customers may be thousands of miles away and in a different jurisdictions.
To engender the kind of trust that will encourage people to make the fullest use of your services, you need to keep your site and network secure, and also demonstrate that it is secure to your user community. Failing to properly secure data collected from your site may leave you open to legal attack and regulatory investigation. Most US states now have laws requiring companies to reveal security breaches to customers, which has brought the scale of the problem to public attention. Conversely, if people believe that your site is trustworthy, they are likely to use it in preference to any similar service.
Netcraft provide a range of services to help with the security of your network:
The Audited by Netcraft service regularly tests your Internet infrastructure and supplies you with the information you need to maintain your security and eliminate vulnerabilities. 
Web server security auditing and performance monitoring
Netcraft's Dedicated Server Monitoring service combines web server vulnerability scanning, network performance monitoring and site outage alerting into one low … 
Web Application Testing service is an Internet security audit, performed by experienced security professionals. The service is designed to rigorously push the defences of Internet networks and applications. 
Netcraft's Mobile App Security Testing service provides a detailed security analysis of your phone or tablet based app. A key feature of this service is manual … 
This is presented as a two-day in-house course for web application development teams and is preceded by the development of some bespoke material based on your own sites. 
A brief comparison of the features of Netcraft’s Dedicated Server Monitoring, Audited by Netcraft and eCommerce Penetration Test and Audit services. 
Frequently Asked Questions about Netcraft’s security testing services. 
Fraudsters are actively using open redirects to facilitate their phishing scams. Netcraft can perform an automatic search of a customer’s web sites to scan for possible redirection URLs in use on a daily basis. 