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It will use features found on many smartphones, such as biometrics and multifactor authentication, like security codes.

The breach occurred, according to testimony and statements by the company, because UnitedHealth tried to integrate Change Healthcare’s technology system with its own without first ensuring that Change’s system would require multifactor authentication, a basic security feature that requires users to enter an algorithmically generated code along with their password to gain access to a system or account.

In the Change Healthcare cyberattack earlier this year, hackers entered a server that lacked multifactor authentication, a basic form of security.

Mr. Wyden said that UnitedHealth had failed to enforce the most basic kind of cybersecurity measure — so-called multifactor authentication.

Make sure to add multifactor authentication, which adds a second layer of verification by requiring a code sent by text message or email, or inserting a USB authenticator key into your device.