Peter M. O’Donnell on Twitter: "@mjtsai The installer you have is signed with a cert; OS X phones home to validate the cert; cert is cancelled; installer doesn’t work."

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Michael Tsai ‏@mjtsai Mar 3

Previously Downloaded OS X Installers No Longer Work: http://mjtsai.com/blog/2016/03/03/previously-downloaded-os-x-installers-no-longer-work/ … #mjtsaiblog
43 retweets 30 likes
Peter M. O’Donnell ‏@pmod Mar 3

@mjtsai @siracusa Calling certificate-signed software "planned obsolescence" is reductive and entirely ignores the security angles.
Michael Tsai ‏@mjtsai Mar 3

@pmod What exactly is the security angle here?
Peter M. O’Donnell ‏@pmod Mar 3

@mjtsai Code signing with expiring certs? Have you not yet considered that some of the recent hiccups are related to compromised certs??
Michael Tsai ‏@mjtsai Mar 3

@pmod In what scenario would it be beneficial securitywise for Apple to disable their own installers that users downloaded from their store?
Peter M. O’Donnell ‏@pmod Mar 3

@mjtsai Because they had to retire a compromised certificate??
Michael Tsai ‏@mjtsai Mar 3

@pmod Sorry, not following you. Which certificate do you think was compromised? And how could that endanger the installer I already have?

‏@pmod

@mjtsai The installer you have is signed with a cert; OS X phones home to validate the cert; cert is cancelled; installer doesn’t work.

7:45 PM - 3 Mar 2016

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