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The discovery of 164 million passwords circulating on the dark web is as concerning as it is a call to rethink how we manage our credentials. This data, often stemming from leaks or past cyberattacks, can fall into the wrong hands and be used for malicious purposes such as taking control of bank accounts, online services, or personal messaging.
When credentials circulate on dark web forums or marketplaces, it means they have been exposed to unknown third parties, often without the victims being informed. This can result from leaks from online services, hacked databases, or reuse of passwords across multiple platforms.
This volume, 164 million, is not just an abstract number: it represents personal, professional accounts, perhaps even some that you use daily. According to a study by NordPass, a large portion of users reuse their passwords across multiple services, which multiplies the risks of cross-compromise.
When this information is accessible to malicious individuals, the consequences go far beyond a simple hacked email. It can involve bank accounts, professional profiles, access to sensitive files, or even services related to health or public services.
The first step, well before panicking, is to know if your accounts have been affected. Services like “Have I Been Pwned” allow you to enter an email address to check if it appears in compromised databases.
This verification reveals if your credentials have been exposed in a known leak. Even if you are not sure you have used these passwords recently, paying attention to these warnings can prevent future attacks.
It is important to understand that the presence of an address in a leak does not necessarily mean a hacker has used it, but it does mean your credentials are publicly available in a hacked archive, which significantly increases the risk of abusive reuse.
If a validation confirms that your address or passwords have circulated, the top priority is to immediately change all passwords associated with sensitive services:
It is not enough to change the password once. The change must be unique for each service, meaning the password used for your email should never be identical to that of another service.
This rule, seemingly restrictive at first glance, is essential: password reuse is one of the main vectors of attacks when credentials are exposed en masse.
Choosing a strong password means combining several elements to increase its complexity:
An effective technique is to use a passphrase composed of several distinct words, for example, a succession of unrelated words but easily memorable for you. These passphrases tend to be longer and therefore harder to guess or crack by brute force.
A strong password alone is not sufficient, but it constitutes a first essential barrier.
One of the most effective measures to protect your accounts is to enable multi-factor authentication (MFA). Rather than relying solely on a password, multi-factor authentication requires an additional proof of identity before granting access:
Even if a hacker manages to obtain your password, they will not be able to log in without this second proof.
Studies by Microsoft show that enabling this protection reduces the likelihood of unauthorized access by over 99%, making it an essential measure in all contexts.
Managing unique and complex passwords for each account poses a practical challenge: how to remember them? The answer is to use a password manager.
These tools secure your credentials in a digital vault protected by a master password. From there, you can generate unique and strong passwords for each service without having to memorize them, as the manager will automatically fill them in when needed.
Password managers also offer:
Many cybersecurity experts consider these tools indispensable for anyone wishing to effectively secure their accounts in a context where millions of credentials circulate freely.
A security flaw exploited by hackers can come from an outdated version of the system or an application. Updates not only add features, but they also mainly fix vulnerabilities regularly exploited.
For this reason, it is recommended to:
These measures minimize the risks of exploiting known vulnerabilities and reduce the likelihood that your devices become entry points for attacks targeting your passwords.
In addition to occasional verification via services like Have I Been Pwned, there are solutions that allow you to continuously monitor if your credentials have reappeared in a leak:
This proactive monitoring allows you to react immediately, well before someone tries to use your credentials for malicious purposes.
Beyond technical measures, some simple habits can enhance your security:
These practices reduce the likelihood of accidental exposure of your credentials and complement technical protections.