Security

What we're doing

In order for you to be safe, we have taken the necessary steps to ensure a secure Internet banking environment.

Internet firewall

The Commerzbank online applications are segregated from the public Internet by a firewall. This acts as a filter that only lets data into Commerzbank online modules from the Internet if the data is authenticated as belonging to the application in question. Direct access from the Internet – hacking attacks – is rendered impossible.

Online applications are authenticated

When you connect to a Commerzbank online application, the Commerzbank system automatically identifies itself by means of a certificate issued by an independent authority. Your computer verifies the authenticity of this certificate before sending data to the Commerzbank system. The certificate guarantees that you are genuinely connected to the online system of the Commerzbank.

Authorising the access

In order to use online applications you must first log on. To do this you must enter your user ID or user name together with your PIN code or password. This identifies you as the genuine user and ensures no one else can obtain access to your data. If the logon details are keyed in incorrectly three times in succession, access to the online account is automatically disabled.

Confidentiality of data transfer, data integrity

All communication between your computer and the Commerzbank online applications is encrypted. The keys used are known only to your computer and to the Commerzbank system. For eavesdroppers, an encrypted message is no more than a string of apparently random characters.

The encryption prevents anyone other than you from deliberately changing the messages. And the Secure Socket Layer protocol in the online banking system effectively puts a stop to the possibility of strings being manipulated by random (“blind”) alteration of characters.

All transactions must be authorised

Each and every transaction has to be authorised by you. There are various methods of authorisation used by the Commerzbank online applications.

In the payment application Global Payment Plus, you authorise transactions with a digital signature which is read out for this purpose by means of your personal signature card using a USB stick. Please take care that your signature stick with the signature card as well as the related PIN are not accessible to other persons.

Only one session possible

The security concept ensures that only one session under your user ID may be active at any one time. If there is an extended period without activity during a session, the session is automatically closed down. The same applies if the connection between your computer and the application fails for any reason: the session is automatically terminated.

128-bit encrypted communication

Communication between your computer and the Commerzbank server is based on the Secure Socket Layer protocol (SSL). The degree of encryption security depends very much on how long the keys are. For maximum safety, the Commerzbank encrypts all communication using at least 128 bits. Decrypting a message like this on a normal computer would take several thousand years.

What you can do

We need your help to protect you. Always be vigilant when it comes to your online banking.

Keep your PIN and TANs secret

Anyone who knows your user ID and PIN can log on under your name. And if such individuals also know your transaction numbers (TANs), they will be able to debit payments from your accounts and portfolios. So please observe a few simple rules:

  • Do not tell anyone the PIN for your online applications. No Commerzbank employee will ever ask you for your PIN or request you to e-mail this number or other personal data such as your name, address or account number.
  • Recently there has been a spate of fraudsters sending e-mails from the address of bona fide companies to request the recipients to log on to a particular web site by clicking a link in the mail. These e-mails usually seem highly plausible and the sites are often virtually identical with the genuine articles. Fraudsters use this scam (called “phishing“, or “password fishing”) to obtain access to your logon data. To play safe, never click on links in e-mails that purportedly lead straight to logon pages of the Commerzbank. To log on, always go via the start pages of companyworld, or key in the address directly.
  • Be sure to change your PIN periodically.
  • Never ever save your PIN and/or TANs on your computer (not even in your finance software).
  • If you have reason to think that the confidentiality of your PIN and/or TANs has been compromised, please disable your access at once and notify your Commerzbank branch or the help desk.
  • If you know you will not be using the Commerzbank applications for some time, you might prefer to disable your online access as an additional safeguard against unauthorised use.

Check the Internet address

Check to the Internet address

When you launch your online application, always check that you are connected to the right Internet address.

Check to the Internet address

It’s important that the address begins with the protocol https – not http – and that an icon showing a lock is visible in the browser footer line. Do not ever enter your personal data (especially your PIN and password) without first verifying that the address and protocol are correct!

Always end with logout

Each and every transaction has to be authorised by you. There are various methods of authorisation used by the Commerzbank online applications.

In the payment application Global Payment Plus, you authorise transactions with a digital signature which is read out for this purpose by means of your personal signature card using a USB stick. Please take care that your signature stick with the signature card as well as the related PIN are not accessible to other persons.

Check the certificate

Communication between your computer and the Commerzbank server is based on the Secure Socket Layer protocol (SSL). The degree of encryption security depends very much on how long the keys are. For maximum safety, the Commerzbank encrypts all communication using at least 128 bits. Decrypting a message like this on a normal computer would take several thousand years.

Browser settings

Always use the latest version of your browser. Up-to-date software will usually have improved security mechanisms. Always close your browser completely after logging off. When working in an alien environment you should play safe and delete the cache completely after use. Follow the instructions in your browser.

Also take note of the recommended browser settings in the installation guide you received with your Commerzbank software.

Protecting against viruses and Trojans

The security concept ensures that only one session under your user ID may be active at any one time. If there is an extended period without activity during a session, the session is automatically closed down. The same applies if the connection between your computer and the application fails for any reason: the session is automatically terminated.

Access from third-party environments

If you use the Commerzbank online applications on computers that are not completely in your control, there are a few additional ground rules you should observe:

  • Never leave the computer unattended while an online session is in progress. If you do have to leave the PC, first close the application or activate a password-protected screensaver.
  • When entering your PIN, password or TANs, be sure that your keyboard inputs are not being memorised or otherwise recorded by anyone else.
  • Protect your TAN list from prying eyes!
  • Do not use a computer which can not be trusted. ‎If you use the Corporate Banking portal in a foreign environment, special care must be taken: if you have the slightest doubt about the seriousness of the owner or the system operators of the PC, on no account enter your access data and, in particular, your PIN via such a third-party PC. If necessary, do without access. No one can protect you if, for instance, a program is installed there which intercepts all your entries, including your user number and PIN, and thus makes abuse possible.
  • Particularly important: Please ensure that, in a foreign environment, you end every connection with the closed area of the Corporate Banking portal (e.g. Online Banking) with the red “Log off” button provided for this purpose (see also: “Ending an online session”). If possible, do not leave your place at the computer during an active online session. If this cannot be avoided, end your online session beforehand, or at least activate a password-protected screensaver, for which only you know the password. When entering the PIN and TANs, make sure that other individuals do not spy out your keyboard entries. If you use the iTAN method, protect your iTAN lists from prying eyes, and remember too that mini cameras may have been installed.

Latest news

Phishing

How to keep your logon data safe from spies

In this scam, Internet users receive an e-mail purported to be from their bank, requesting them on some pretext or other to log on at their online banking site via a link provided in the mail.

However, the link takes the recipient to a fake Internet site that is virtually identical to the genuine article. Visitors are then requested to enter their user number, PIN and possibly also a TAN.

Once users have entered this data and confirmed the transfer, the logon information is communicated to an unauthorised computer, usually out of the country. The data can then be used unlawfully.

This is how you protect yourself

First, you can be sure that the Commerzbank will never ask you by e-mail to log on for an update of your personal data or similar.

You can therefore safely ignore e-mails such as this. Never use the links specified in such mail. If in doubt, contact our help desk.

Phone +49 (0)40 3 76 95 100 (Monday to Friday from 8.00 am to 7.00 pm) or fill in the contact form.

You are also welcome to send us your message via fax to the following fax number: +49 (0) 40 - 3 76 95 400.

We also recommend the following procedure for logging on:

  • Key the address in the browser window manually, or use an entry you have previously created in the “Favourites” menu.
  • Do not use any links sent in e-mails, even if the mail appears to be from a trusted source.
  • Do not fill in electronic forms in e-mails that ask you to provide logon data.
  • Use a current browser. You can obtain security updates from the producer of your operating system, for example from https://windowsupdate.microsoft.com for Windows operating systems.

If the worst happens: what to do if you’ve navigated to the link

If you think you’ve fallen victim to a ”phishing” mail and your logon data has been compromised by fraudsters, here’s what to do:

  • If you have made known your logon data, please immediately disable your access in the Online Banking/Administration menu and contact your Commerzbank branch or the help desk.

Trojans

“Trojans” – be careful with invoice emails

In the text of such fraudulent invoice emails, typically a high invoice amount is specified. In an attachment to the email the unsuspicious reader shall supposedly find the details for the reason of the high invoice. However, with it, the recipient shall only be induced to open the attachment with which the damaging software (e.g. so-called Trojans) then installs itself on the computer. Therefore, be very careful and let nobody take you by surprise.

On principle, the following applies: Do not open any attachments of emails of dubious origin.

But be also very suspicious if the sender is well-known and/or known to you. Therefore, only open such “invoices” if you have a business relationship with this company and if you have previously explicitly agreed to the electronic sending of invoices via email. In the case of doubt, ask the invoicing party prior to opening the attachment.

This is how you protect yourself

Use virus scanner software and keep it updated. Set it in a way that your emails are always checked. Also, scan all drives of your computer on a regular basis.

Special indications for users of "Payment Transactions" applications