Google is making it tougher for computer hackers and other imposters to break into e-mail accounts and other password-protected services. An additional security measure introduced Monday will require typing a six-digit code after an accountholder's Google password is entered. The codes will be sent to people's mobile phones.

The two-step login means it will take more than a password to get into an account. The extra protection initially will be offered to companies and government agencies subscribing to a Google service that provides e-mail and other office applications. Google Inc. also is offering the added security to schools that rely on Google to run their e-mail.

People using Google's free Gmail service will be able to make the security codes part of their login process within the next few months.

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