On the website of the American mobile operator AT & T published quite funny
requirements for user passwords . Oddly enough, this is not an April Fool's joke.

The maximum limit of 24 characters is still understandable, this is often the case, although such restrictions are criticized by information security specialists as
having no technical explanation . The last point is more interesting - a ban on obscene language.
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A couple of days ago, a security and infrastructure engineer at Twitter
noticed unusual requirements for passwords.