While many sites already provide this type of code via SMS, it's not advisable to use this method because hackers can sometimes hijack SMS messages. It creates a unique, time-limited key that needs to be inserted by the user to unlock the website. That's where multi-factor authentication comes into play. However, if a criminal is able to crack the code, they still can access your information. Long and complex passwords are an excellent first step for protecting your online accounts from hackers.
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