Choosing a username is often underestimated in information security. Even though most attention goes to passwords, the importance of a well-considered username shouldn't be overlooked. A carefully chosen username can act as a first line of defense against unauthorized access and identity theft.
Avoid identifying personal data: first and foremost, it's crucial not to include personal details such as first name, last name, address or phone numbers in your username. These seemingly harmless details can be exploited to orchestrate targeted attacks. It sounds obvious, but a quick look at username databases reveals a surprising number of risky choices that seem almost designed to reveal a password or personal information.
Keep it separate from your email address: avoiding the use of your email address as your username reduces the attack surface and limits an attacker's ability to link different accounts to the same person.
Diversify your credentials: reusing the same username-and-password combination across multiple accounts significantly increases the risk. Breached databases containing usernames and passwords are frequently published online. That's why it's essential to create unique combinations for each service, especially for sensitive accounts like banking ones.
Avoid giving away password clues: your username shouldn't provide any hint that could be linked to your password. For example, if your password includes the word "red", avoid using "color" as your username.
Adapt it to the context: finally, your choice of username should reflect the context in which it's used. A business account calls for a different approach than a personal or social account, both in terms of formality and visibility.
A well-thought-out username is an extra barrier against intrusions and online compromise, so it's worth spending a little time choosing one!