As part of this encryption system, WhatsApp uses the so-called “security number”. But what does it mean when this changes? This article answers this question in detail.

What is the WhatsApp security number?

It is a unique code that is generated for every interaction with WhatsApp, i.e. for every conversation between two users. This number is a central part of the encryption process and is used to verify the identity of those involved and to ensure secure message transmission.

Why is this number changing?

The reason why the security number changes is very simple: one of the users installed WhatsApp on a new device or reinstalled the app. Since the security number is tied to the respective device and the installation of WhatsApp, every change results in a new number.

Even if a user changes their phone number but continues to use WhatsApp on the same device, the security number can change.

Should I worry if the security number changes?

In general, there is no reason to be alarmed in this case.
As mentioned above, most of the time this happens for legitimate reasons, e.g. B. to change the device or reinstall the application. However, if you receive a notification about a security number change and don't see any obvious reason for it, it may be a good idea to ask and make sure your contact has actually switched apps or devices.

It is important to note that this does not mean that your previous messages have been compromised or that future messages are unsafe. Regardless of whether the security number is changed, the end-to-end encryption remains fully effective.

Do I need to take action?

WhatsApp offers the option to be notified when the security number changes. This is a useful feature that helps you stay updated about such changes.

If you receive such a notification, you can verify the new number with your contact to ensure that the change is legitimate. To do this, you can contact the person in question in person or by telephone and compare the number. In most cases this is just a formality, but it is always good to remain vigilant.

Conclusion

Changing the WhatsApp security number is a normal part of the encryption process and should typically not be a cause for concern about the security of your messages. However, it is important to be aware of such changes and to take additional steps to verify if necessary.

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