Lapsed Apple certificate triggers massive Mac app fiasco
A lapsed Apple digital certificate today triggered a massive app fiasco that prevented Mac users from running software they'd purchased from the Mac App Store.
"Whenever you download an app from the Mac App Store, the app provides a cryptographically-signed receipt," explained Paul Haddad, a co-founder of Tapbots, the company behind the popular Tweetbot Twitter client, in an email reply to questions today. "These receipts are signed with various certificates with different expiration dates. One of those is the 'Mac App Store Receipt Signing;' that expires every two years. That certificate expired on 'Nov 11 21:58:01 2015 GMT,' which caused most existing App Store receipts to no longer be considered valid."
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