New passwords should not be the same as how many previous passwords?

The correct understanding of password history in the context of security practices suggests that new passwords should not be the same as a specified number of previous passwords to enhance security and minimize the risk of unauthorized access. A requirement to have new passwords that differ from four previous passwords establishes a strong foundation for password hygiene.

When a system enforces this requirement, it ensures that even if a previous password is compromised, an attacker cannot easily predict the next password the user might choose. This level of separation encourages users to create distinct passwords over time, thereby reducing the likelihood of reverting to old passwords that may have been exposed to security threats.

Other choices provide fewer previous passwords for comparison, which may be less effective in mitigating risks associated with password reuse. In contrast, requiring a break from the last four passwords fosters more robust security practices as it compels users to create a varied password landscape, ultimately leading to a stronger defense against potential breaches.