One in three people write down computer passwords, undermining their security, and companies should look to more advanced methods, including biometrics, to ensure their systems are safe, a new study shows.

A study released Tuesday by global research firms Nucleus Research and KnowledgeStorm found companies' attempts to tighten information technology (IT) security by regularly changing passwords and making them more complex by adding numbers as well as letters had no impact on security.

At CNN.

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