[Composer\Repository\RepositorySecurityException]
The contents of http://packagist.org/p/symfony/browser-kit$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 -geadd this script
"repositories": {
"packagist": { "url": "https://packagist.org", "type": "composer" }
}
be like this
Ref : https://github.com/composer/composer/issues/2835#issuecomment-38678249
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