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This publication is available at https://www.gov.uk/government/publications/how-hm-revenue-and-customs-keeps-you-safe-online/how-hm-revenue-and-customs-keeps-you-safe-online
1. Secure sign in
HM Revenue and Customs (HMRC) Online Services are only available to customers who register their details. Every time you log in, you must enter your User ID and password before you can access your services.
2. Time out
If you’ve forgotten to log out of your online service HMRC take care of this for you. After 15 minutes of inactivity you will be automatically logged out. But it’s good practice to close your internet browser when finally leaving the HMRC website.
3. Firewall protection
HMRC uses firewall protection as a very effective high security barrier around its systems and your data. This detects any attempts at unauthorised entry.
4. Security certificates
Any page of the HMRC website which contains sensitive information is protected by a technology known as SSL (Secure Sockets Layer). This encrypts the data you send to HMRC via the internet. When you log in to their online services you are always protected. For example, in Internet Explorer this may be shown by a padlock in the address bar.
5. Last login date and time
As an additional security measure HMRC shows the date and time that you last logged in to or online services. This is displayed once you have entered your User ID and password. If you believe the details displayed are incorrect it is important that you report the matter to our Online Services Helpdesk immediately.