Authentication is an important part of working on a computer, whether logging on, opening encrypted data or using web services like PayPal. Usernames and passwords still play an important role, even if many experts advise against using passwords as the only authentication method. Even approaches to passwords have changed over time. Until recently, experts recommended choosing complex passwords using special characters, numbers and uppercase and lowercase letters. However, many professionals now consider that complex passwords are inconvenient for users, especially if they must be changed frequently. Phrases such as a quote from a book or a sentence which is relevant to the log-in context are more meaningful for users. Such phases can easily reach more than 20 characters and are nevertheless much easier to remember than complex, eight-letter combinations of letters and numbers.
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