Add another layer of protection between your Dropbox account and the rest of the Internet by enabling one of the service's newly added security features.

Dropbox usernames and passwords were compromised via third-party Web sites. As a result,Dropbox said it would work on adding more security features to help keep accounts safe.to access the Dropbox Web site or service, you'll need to enter your current password and a security code using this new method. This code can be sent to you via SMS or be generated by a mobile authenticator app.

let's go....

• Log in to your Dropbox account from a Web browser.

• Click on the user menu(in the top-right corner).

• click on Settings & go to the Security tab. 

• click the "change" link next to "Two-step verification."

• After entering your password, you'll be prompted to pick a method of receiving authentication codes in the future.

• choose SMS as your method of receiving codes & provide your mobile number.

• Enter the six-digit code from SMS or the authenticator app into the Web site.

• Dropbox will now show you a 16-digit code to be used in case you lose your device.(Write this down or take a screenshot and keep the emergency backup code in a safe, handy place if you need to change the phone number your regular codes are sent to)

• click Enable for the two-step verification