All it takes to make your online banking as safe as possible and to protect your account from unauthorised access is staying on top of the latest safety alerts and following a few simple rules.
TANs (Transaction Number) can only be used for personal transactions. Your bank will never ask you to enter a TAN for prize draws, security updates or to refund money to your account. Hence, please always use caution if you are asked for your bank details or a TAN when you are not actually making a transaction.
E-mails and attachments can contain viruses and Trojans and infect your computer and smartphone. For this reason, do not open attachments of unknown origin, treat e-mails with promises in their subject line with caution and delete all e-mails sent by unknown senders.