composer error : laravel cann't install

  The contents of$7243ec71a1525094 
  0c9d6c520acf1894c56aed85abb53ce09abb1ddf7702855a.json do not match its signature. This should indicate a man-in-the-middle attack. Try running composer again and report this if you think it is a mistake.

type this command :

composer config -ge

add this script

"repositories": {
        "packagist": { "url": "", "type": "composer" }
be like this

 Ref :


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